US20230248004A1 - Novel organic fungicide for use against fusarium wilt - Google Patents
Novel organic fungicide for use against fusarium wilt Download PDFInfo
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- US20230248004A1 US20230248004A1 US18/006,717 US202118006717A US2023248004A1 US 20230248004 A1 US20230248004 A1 US 20230248004A1 US 202118006717 A US202118006717 A US 202118006717A US 2023248004 A1 US2023248004 A1 US 2023248004A1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/40—Liliopsida [monocotyledons]
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/30—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests characterised by the surfactants
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
- A01N65/20—Fabaceae or Leguminosae [Pea or Legume family], e.g. pea, lentil, soybean, clover, acacia, honey locust, derris or millettia
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/40—Liliopsida [monocotyledons]
- A01N65/42—Aloeaceae [Aloe family] or Liliaceae [Lily family], e.g. aloe, veratrum, onion, garlic or chives
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- A01P1/00—Disinfectants; Antimicrobial compounds or mixtures thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- A01P3/00—Fungicides
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
Definitions
- the present invention is a novel agricultural input created to treat fungal diseases and more specifically, to the treatment or management of fusarium wilt.
- Banana is an important crop for food security and rural civil perceptions particularly in Asia, Africa and Latin America and Caribbean. This popular crop is now threatened by a new race (Tropical Race 4-TR4) of a soil borne disease known as Fusarium wilt (FW). Currently, this race is affecting 19 sites in 10 countries mostly in Southeast Asia, and 25 countries are considered at immediate risk in Asia, Near East and Africa. Preliminary assessment of scientists indicates that TR4 could potentially spread up to 1.6 million ha by 2040 if no significant interventions are instituted. This represents 17 percent of current area in production and corresponds to annual production potential of 36 million tonnes. Potential losses in these areas could have substantial socio-economic impacts on civils along the banana value chain.
- Fusarium wilt is a serious disease of banana for which there is no specific product which can manage the disease and now this product can manage fusarium wilt in banana. It is a widespread plant disease caused by fungus Fusarium oxysporum. Fusarium oxysporum is a soil-inhabiting fungus that can infect a number of plants and is particularly devastating when it attacks crops such as melons, bananas, tomatoes, etc. When it attacks bananas, it is often referred to as the Panama disease.
- This disease is highly epidemic mainly in tropical countries where the temperature of the soil tends to be above 75° F. It can for long periods of time in the soil without infecting plants. This resilience and uncommon toughness make this fungus a particularly dangerous enemy for large plantations, farms and anyone who subsist primarily on a diet of foods that can be infected by this fungus.
- Infected plants are typically shorter than disease-free plants. Infected plants have leaves which turn pale green to golden yellow. The leaves subsequently wilt die and fall off. Elsewhere on the plant, there is a presence of visible dark streaks in the xylem tissue of the roots and lower stem, and the roots may begin to deteriorate.
- the application of synthetic fungicides is perhaps the most common form of chemical control of the fungus.
- the fungicide are applied to the soil surrounding the plant of interest. Although some forms of the fungus have developed resistance to fungicides.
- the current best approach of control the fungus is to develop and plant new varieties of the plants which are resistant to the fungus.
- a novel organic fungicide comprising a plant extract which has the ability to prevent, reduce or eliminate the appearance, growth or spread of fusarium wilt.
- an aqueous fungicidal composition comprising Karanj oil.
- an aqueous fungicidal composition comprising Karanj oil and fermented aloe vera extracts.
- an aqueous fungicidal composition comprising Karanj oil; fermented aloe vera extracts and a natural surfactant.
- an organic fungicidal composition comprising Karanjin.
- the composition further comprises a surfactant, such as hibiscus leaf extract.
- the composition further comprises fermented extracts of aloe vera.
- the composition further comprises water as a solvent.
- compositions comprising karanj oil, hibiscus leaf extract and fermented extracts of aloe vera provided surprising control and management of the fusarium wilt on banana tree trunks.
- a composition according to a preferred embodiment of the present invention it was determined that 95% of the trees had no traces of fusarium wilt.
- the advantages of such a composition are substantial given the increasing environmental regulations prohibiting or severely limiting the use of synthetic fungicides such as those mentioned previously. Not only are synthetic fungicides inherently dangerous when it comes to consumption but they also pose a great threat to waterways as well as the soil on which they end up.
- compositions according to a preferred embodiment of the present invention are not synthesized by man, such environmental restrictions do not apply.
- the natural origination of the components of a preferred embodiment of the present invention allow it to be used in substantially all of the possible cultivation areas in the world.
- the use thereof would allow the cultivation of plants beyond the 60-foot limit enacted by regulations.
- plants can be cultivated closer to roads and waterways without negatively impacting the environment as all the components are naturally sourced.
- Karanjin is a furanoflavonol, a type of flavonoid obtained from the seeds of the karanja tree, a wild tree native to southern India. It is widespread and is an important source of bio-fuel as a substitute for diesel and to run power grid systems to run water pumps. Karanja is known as a herbal medicine mostly used for the treatment of skin diseases. According to a preferred embodiment of the present invention, karanjin is present in an amount ranging from 0.5 to 5 wt % of the total weight of the composition. Preferably, it is present in an amount ranging from 1 to 3 wt % and even more preferably, from 1 to 2 wt. %. A most preferred composition comprises karanjin at 1.37 wt %.
- Fermented extracts of aloe vera can be obtained by fermenting the flesh of the plant. This yields among other compounds, lactic acid bacteria (LAB) which have antimicrobial activity.
- LAB lactic acid bacteria
- the combination of karanj oil and fermented extracts of aloe vera yields a potentiated fungicidal composition which has a particular affinity for the reduction, control, management and/or eradication of fusarium wilt fungus.
- applying a preferred composition of the present invention to banana tree leaves would help in eliminating or at least substantially minimizing the presence of such fungus. In large monoculture farms, this composition would represent a number of advantages.
- composition according to a preferred embodiment of the present invention is an organic formulation, it does not leave any residue. After eliminating the fungus in question, the composition's components break down into water, oxygen and carbon dioxide and, as such, makes it the best organic fungicide available. Additionally, a preferred embodiment of the present invention has exhibited natural growth enhancing effect by increasing the overall growth of the plant with more pronounced effect seen on the leaves in terms of increased width as well as in length.
- the surfactant is a naturally occurring surfactant.
- it is a hibiscus leaf extract.
- the hibiscus leaf extracts has natural surfactants in the form of saponins which act as surfactants to the organic formulation by way of reducing surface tension which enables the product to spread on the leaf surface and make the active ingredient available to act the fungus efficiently.
- Naturally occurring compounds deemed to be suitable alternative for hibiscus include soap nuts.
- Other natural surfactants considered within the scope of the present invention include: coco glucoside, as well as decyl glucoside both derived from natural sources.
- an organic composition to manage fusarium wilt effectively it works on fungal diseases particular to banana trees but also works on other plant fungal diseases too.
- an organic fungicide with natural growth promoting effect on plants there is provided an organic fungicide with natural growth promoting effect on plants.
- composition comprising plant extracts and plant oils as per the following:
- a food product classified as ‘clean food’ grown in the presence of an aqueous fungicidal composition comprising Karanj oil.
- the composition further comprises fermented aloe vera extracts.
- the composition further comprises fermented aloe vera extracts and a natural surfactant.
- the Karanj oil is present in an amount ranging from 1 to 5 wt % of the total weight of the composition.
- the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt % of the total weight of the composition.
- the natural surfactant is present in an amount ranging from 30 to 60 wt % of the total weight of the composition. Even more preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt % of the total weight of the composition.
- a food product classified as ‘residue-free’ grown in the presence of an aqueous fungicidal composition comprising Karanj oil.
- the composition further comprises fermented aloe vera extracts.
- the composition further comprises fermented aloe vera extracts and a natural surfactant.
- the Karanj oil is present in an amount ranging from 1 to 5 wt % of the total weight of the composition.
- the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt % of the total weight of the composition.
- the natural surfactant is present in an amount ranging from 30 to 60 wt % of the total weight of the composition. Even more preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt % of the total weight of the composition.
- a food product grown with an exposure to an aqueous fungicidal composition comprising Karanj oil.
- the composition further comprises fermented aloe vera extracts.
- the composition further comprises fermented aloe vera extracts and a natural surfactant.
- the Karanj oil is present in an amount ranging from 1 to 5 wt % of the total weight of the composition.
- the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt % of the total weight of the composition.
- the natural surfactant is present in an amount ranging from 30 to 60 wt % of the total weight of the composition. Even more preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt % of the total weight of the composition.
- Organic food is defined by The Department for Agriculture and rural Affairs (DEFRA) as: ‘Organic food is the product of a farming system which avoids the use of man-made fertilisers, pesticides; growth regulators and livestock feed additives. Irradiation and the use of genetically modified organisms (GMOs) or products produced from or by GMOs are generally prohibited by organic legislation.’
- GMOs genetically modified organisms
- Organic agriculture is similarly defined by DEFRA as: ‘Organic agriculture is a systems approach to production that is working towards environmentally, socially and economically sustainable production. Instead, the agricultural systems rely on crop rotation, animal and plant manures, some hand weeding and biological pest control.’
- the Clean Food Standard is a voluntary best-practice standard for food producers aimed at identifying fresh grown foods that meet exceptional standards of product purity.
- the standard extends the concept of purity embodied in national Clean Air and Clean Water regulations into the food arena. Specifically, the standard addresses four areas of potential concern: 1) pesticide residues, 2) food pathogens, 3) industrial contaminants and heavy metals; and 4) GMOs.
- the Clean Food Standard is intended to assist commercial, government and institutional buyers as well as consumers make better informed decisions about the fresh grown foods they purchase in terms of product purity considerations, thereby protecting the health and welfare of consumers by limiting their risk of exposure to potentially harmful residues and pathogens in the food supply.
- the Clean Food Standard is also intended to provide marketplace recognition to food producers who are voluntarily taking exceptional measures to protect the purity of the food they produce, thereby encouraging food producers to adopt pest management regimes, growing practices and food handling methods that minimize potential harm to human health and the environment from pesticide exposure, food pathogens, and other contaminants. Further, the Clean Food Standard is intended to serve as the basis for specific market claims, to be certified by recognized independent third parties who have no ownership or brokerage interest in the foods being certified, and who have no vested interest in the outcome of a given certification. The Clean Food Standard is also intended to define product purity requirements that can be used to inform the development of broader national standards for sustainable agricultural practices.
- LOD Limit of detection
- PAM II protocols for pesticides.
- ICP-MS for heavy metals.
- LODs are established in accordance with EPA protocols for ICP-MS.
- EPA 600-series protocols for other industrial chemicals.
- the purity requirements of a Clean Food include synthetic pesticides with US EPA tolerances. Therefore, a clean food product shall be shown to be free of pesticide residues based on LODs for all registered synthetic pesticides with established tolerances.
- the maximum residue limit for pesticides is assessed by considering that the residue definition upon which maximum residue limits (MRLs) are based typically includes the parent chemical and often includes corresponding metabolites.
- a chemical may have multiple residue definitions, for example, between food crops and livestock commodities.
- the residue definition for all chemicals with established MRLs regulated under the Pest Control Products Act are listed in a table which reflects the content previously found in MRL listings under “Chemical Name of Substance”.
- MRLs established in Canada may be found using the Maximum Residue Limit Database on the Maximum Residue Limits for Pesticides webpage.
- the database allows users to search for established MRLs, regulated under the Pest Control Products Act, both for pesticides or for food commodities.
- There are over 400 chemicals listed on the Canadian website which produce at least one metabolite which can be of concern upon consumption of a foodstuff containing such.
- Bananas are never included in the list of the ‘Dirty Dozen’, the most pesticide and fungicide contaminated fruits and vegetables sold in stores. However, that is not to say that they are free of any synthetic chemicals, nor does it mean that farmers growing bananas are sheltered from the harmful effects of such chemicals.
- pesticides While it is commonplace knowledge that pesticides are used to protect crops against insects, weeds, fungi and other pests. It is also commonplace knowledge that pesticides are potentially toxic to humans and can have both acute and chronic health effects, depending on the quantity and ways in which a person is exposed. Some of the older, cheaper pesticides can remain for years in soil and water. These chemicals have been banned from agricultural use in developed countries, but they are still used in many developing countries. The greatest dirty secret of pesticides and fungicides is that the people who face the greatest health risks from exposure to pesticides are those who come into contact with them at work, in their home or garden.
- pesticides are among the leading causes of death by self-poisoning, in particular in low- and middle-income countries. Because of their inherent toxicity and due to the fact that they are deliberately spread in the environment, the production, distribution, and use of pesticides require strict regulation and control. Regular monitoring of residues in food and the environment is also required. The most at-risk population are people who are directly exposed to pesticides. This includes agricultural workers who apply pesticides, and other people in the immediate area during and right after pesticides are spread. The general population—who are not in the area where pesticides are used—is exposed to significantly lower levels of pesticide residues through food and water.
- Pesticides and fungicides can prevent large crop losses and will therefore continue to play a role in agriculture. However, the effects on humans and the environment of exposure to pesticides are a continuing concern.
- the composition is sprayed on the ground close to a banana tree plant so as to soak the roots and prevent/reduce/destroy the presence of fusarium wilt on the plant.
- the product is drenched around the root zone to manage the plant disease. It is hypothesized by the inventors that the mode of action of a composition according to a preferred embodiment of the present invention is by preventing the formation of spores and eventually the spread of fungus is managed.
- the use composition will produce a food product classified as ‘clean food’.
- the use composition will produce a food product classified as ‘residue-free food’ or ‘residue-free product’ or ‘residue-free food product’.
- the Karanj oil is present in an amount ranging from 1 to 5 wt. %.
- the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt. %.
- the natural surfactant is present in an amount ranging from 30 to 60 wt. %. More preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt. %.
- composition described herein for the treatment, prevention and/or management of fusarium wilt.
- a method for the prevention, treatment and/or management of fusarium wilt on plants prone to such fungus comprising the steps of:
- a method for the stimulation of the growth of a plant prone to the fungus fusarium wilt comprising the steps of:
- the composition has both anti-fungal properties and growth stimulating properties, which while increasing the growth of the plant and it has shown to increase the plant survival rate to almost 95%.
- the composition according to a preferred embodiment of the present invention costs less than synthetic fungicides and has practically no after-market costs (no clean-up costs, no lawsuits because of toxicity unlike some synthetic products, no water discharge control measures necessary, greater proportion of the land can be used, etc.). Moreover, it manages the disease effectively and has an added advantage of accelerating the growth of banana tree plants. It has been reported that the use of a composition according to the present invention has increased the yield of each banana tree by up to 20-25% more bananas as well as providing larger bananas than untreated or plants treated with chemical pesticides.
- the application of a composition of the present invention would allow a farmer to apply said composition on the bananas without having to cover them in a plastic bag. This has a three-fold advantage, less workforce necessary to cover the banana plants, no usage of plastic bags and subsequent disposal thereof and maintaining a clean food labelling standard.
- the application of a composition of the present invention would allow a farmer to have fewer dead banana tree leaves. Dead leaves due to infection from a fungi must be removed quickly to prevent the spreading of the fungal infections to other leaves and ultimately to the entire plant. The fact that such a composition provides the farmer with such an outstanding performance against fungal infections would allow him to employ fewer people whose sole job is to walk up and down the banana grove and cutting off infected leaves.
- the composition has no specific disadvantages in comparison to the synthetic fungicides being currently used. Nonetheless, it is preferable to take care when using the fungicide according to a preferred embodiment on plants by using appropriate eye protection and nose masks to prevent any potential damage.
- Testing to determine the absorption of fungicide into the flesh of bananas was conducted in order to eventually determine whether a natural fungicide would avoid such drawback. Testing was conducted at the University of Guelph Agriculture and Food Laboratory in order to assess the pesticide and fungicide content of a variety of bananas obtained on the shelves of a Canadian supermarket.
- Bananas obtained from six different sources (3 regulars and 3 organics) are labelled as #1 to #3 (for both regular and organic sources).
- the first series of testing involved assessing the content of ethylenebisdithiocarbamates (EBDC) in the flesh of the bananas purchased.
- Table #1 provides a summary of the results from the testing.
- the second series of testing by GC-MS/MS multiresidue screen was done to assess the presence of pesticides (as well as their content and identity) in the flesh of the bananas purchased.
- Table #2 provides a summary of the results from the testing.
- the testing data is a clear indication that despite all of the best efforts deployed, even bananas labelled ‘organic’ yield fruit which flesh contains pesticide residues.
- the above testing is proof that a residue-free product, such as a banana has still yet to be achieved on large monocultures as those are prone to infestations of insects, fungus, parasites or the like.
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Abstract
Description
- The present invention is a novel agricultural input created to treat fungal diseases and more specifically, to the treatment or management of fusarium wilt.
- Banana is an important crop for food security and rural livelihoods particularly in Asia, Africa and Latin America and Caribbean. This popular crop is now threatened by a new race (Tropical Race 4-TR4) of a soil borne disease known as Fusarium wilt (FW). Currently, this race is affecting 19 sites in 10 countries mostly in Southeast Asia, and 25 countries are considered at immediate risk in Asia, Near East and Africa. Preliminary assessment of scientists indicates that TR4 could potentially spread up to 1.6 million ha by 2040 if no significant interventions are instituted. This represents 17 percent of current area in production and corresponds to annual production potential of 36 million tonnes. Potential losses in these areas could have substantial socio-economic impacts on livelihoods along the banana value chain.
- Fusarium wilt is a serious disease of banana for which there is no specific product which can manage the disease and now this product can manage fusarium wilt in banana. It is a widespread plant disease caused by fungus Fusarium oxysporum. Fusarium oxysporum is a soil-inhabiting fungus that can infect a number of plants and is particularly devastating when it attacks crops such as melons, bananas, tomatoes, etc. When it attacks bananas, it is often referred to as the Panama disease.
- This disease is highly epidemic mainly in tropical countries where the temperature of the soil tends to be above 75° F. It can for long periods of time in the soil without infecting plants. This resilience and uncommon toughness make this fungus a particularly dangerous enemy for large plantations, farms and anyone who subsist primarily on a diet of foods that can be infected by this fungus.
- Infected plants are typically shorter than disease-free plants. Infected plants have leaves which turn pale green to golden yellow. The leaves subsequently wilt die and fall off. Elsewhere on the plant, there is a presence of visible dark streaks in the xylem tissue of the roots and lower stem, and the roots may begin to deteriorate.
- Currently, several methods are employed to control fusarium wilt each one with a varying degree of effectiveness. One of those involves the removal and destruction of the leaves infected by the fungus. Moreover, using clean seeds helps in the control of the spread of the disease. Crop rotation is not a method of control as the fungus can survive for long periods of time in the soil without living off a host plant.
- The application of synthetic fungicides is perhaps the most common form of chemical control of the fungus. The fungicide are applied to the soil surrounding the plant of interest. Although some forms of the fungus have developed resistance to fungicides.
- The current best approach of control the fungus is to develop and plant new varieties of the plants which are resistant to the fungus.
- Prior to treatment by chemical fungicides it is desirable that infected leaves be removed in order to increase the possibility of tree survival. Although fungicides have improved over the years, the pathogen has been shown to have developed some resistance. This, in turn, requires a more frequent use the synthetic fungicide and increases the impact on the environment and consequently on the health of workers in the industry, especially those handling the chemicals.
- In light of the prior art, there exists a clear need for a fungicide which does not have the drawbacks of currently available fungicides to help in the fight against fusarium wilt. Bananas are clearly a crop of significant importance for most of the world. Its significance is even greater in countries where they are grown and they form part of the staples of the diet of the population. Such a widespread and difficult to control fungus has an immediate and critical impact on those people and as such a better method to control this fungus is required and long overdue.
- According to an aspect of the present invention, there is provided a novel organic fungicide comprising a plant extract which has the ability to prevent, reduce or eliminate the appearance, growth or spread of fusarium wilt.
- According to a first aspect of the present invention, there is provided an aqueous fungicidal composition comprising Karanj oil.
- According to another aspect of the present invention, there is provided an aqueous fungicidal composition comprising Karanj oil and fermented aloe vera extracts.
- According to another aspect of the present invention, there is provided an aqueous fungicidal composition comprising Karanj oil; fermented aloe vera extracts and a natural surfactant.
- According to a preferred embodiment of the present invention, there is provided an organic fungicidal composition comprising Karanjin. Preferably, the composition further comprises a surfactant, such as hibiscus leaf extract. Preferably, the composition further comprises fermented extracts of aloe vera. Preferably, the composition further comprises water as a solvent.
- The inventors have unexpectedly found that a composition comprising karanj oil, hibiscus leaf extract and fermented extracts of aloe vera provided surprising control and management of the fusarium wilt on banana tree trunks. In fact, upon testing a composition according to a preferred embodiment of the present invention it was determined that 95% of the trees had no traces of fusarium wilt. The advantages of such a composition are substantial given the increasing environmental regulations prohibiting or severely limiting the use of synthetic fungicides such as those mentioned previously. Not only are synthetic fungicides inherently dangerous when it comes to consumption but they also pose a great threat to waterways as well as the soil on which they end up. In certain countries, regulations do not permit the use of synthetic fungicides within 60 feet of any roadways and in some cases also 60 feet from any waterway. When taking this into account there is a clear disadvantage for even a small farmer of utilitizing such pesticides as the restrictions prevent the cultivation of large tracts of land.
- Because the compositions according to a preferred embodiment of the present invention, are not synthesized by man, such environmental restrictions do not apply. In fact, the natural origination of the components of a preferred embodiment of the present invention allow it to be used in substantially all of the possible cultivation areas in the world. Moreover, as it does not fall under the definition of synthetic fungicide, the use thereof would allow the cultivation of plants beyond the 60-foot limit enacted by regulations. Hence, plants can be cultivated closer to roads and waterways without negatively impacting the environment as all the components are naturally sourced.
- Karanjin is a furanoflavonol, a type of flavonoid obtained from the seeds of the karanja tree, a wild tree native to southern India. It is widespread and is an important source of bio-fuel as a substitute for diesel and to run power grid systems to run water pumps. Karanja is known as a herbal medicine mostly used for the treatment of skin diseases. According to a preferred embodiment of the present invention, karanjin is present in an amount ranging from 0.5 to 5 wt % of the total weight of the composition. Preferably, it is present in an amount ranging from 1 to 3 wt % and even more preferably, from 1 to 2 wt. %. A most preferred composition comprises karanjin at 1.37 wt %.
- Fermented extracts of aloe vera can be obtained by fermenting the flesh of the plant. This yields among other compounds, lactic acid bacteria (LAB) which have antimicrobial activity. According to a preferred embodiment of the present invention, the combination of karanj oil and fermented extracts of aloe vera yields a potentiated fungicidal composition which has a particular affinity for the reduction, control, management and/or eradication of fusarium wilt fungus. Hence, applying a preferred composition of the present invention to banana tree leaves would help in eliminating or at least substantially minimizing the presence of such fungus. In large monoculture farms, this composition would represent a number of advantages. It would eliminate the need to monitor water discharges of synthetic fungicides, as it is made with natural products. It also allows to use a greater part of the potential arable surface area as it is not affected by the environmental restrictions applicable to synthetic fungicides. Advantageously, as the composition according to a preferred embodiment of the present invention is an organic formulation, it does not leave any residue. After eliminating the fungus in question, the composition's components break down into water, oxygen and carbon dioxide and, as such, makes it the best organic fungicide available. Additionally, a preferred embodiment of the present invention has exhibited natural growth enhancing effect by increasing the overall growth of the plant with more pronounced effect seen on the leaves in terms of increased width as well as in length.
- According to a preferred embodiment of the present invention, the surfactant is a naturally occurring surfactant. Preferably, it is a hibiscus leaf extract. The hibiscus leaf extracts has natural surfactants in the form of saponins which act as surfactants to the organic formulation by way of reducing surface tension which enables the product to spread on the leaf surface and make the active ingredient available to act the fungus efficiently.
- Other naturally occurring compounds deemed to be suitable alternative for hibiscus include soap nuts. Other natural surfactants considered within the scope of the present invention include: coco glucoside, as well as decyl glucoside both derived from natural sources.
- According to a preferred embodiment of the present invention, there is provided an organic composition to manage fusarium wilt effectively. It works on fungal diseases particular to banana trees but also works on other plant fungal diseases too.
- According to another preferred embodiment of the present invention, there is provided an organic fungicide with natural growth promoting effect on plants.
- According to a preferred embodiment of the present invention, there is provided a composition comprising plant extracts and plant oils as per the following:
-
- Karanj oil—1.27% (0.5 to 5 wt % of the total weight of the composition) Karanjin content in Karanj Oil is 0.002%
- Hibiscus leaf extract—38 wt % of the total weight of the composition—(preferably 30 to 40 wt % of the total weight of the composition);
- Aloe vera extracts (fermented)—56.9 wt % of the total weight of the composition (preferably 40 to 60 wt %); and
- water 3.83% (preferably 3 to 5 wt %)
- According to another aspect of the present invention, there is provided a food product classified as ‘clean food’ grown in the presence of an aqueous fungicidal composition comprising Karanj oil. Preferably, the composition further comprises fermented aloe vera extracts. Preferably, the composition further comprises fermented aloe vera extracts and a natural surfactant. More preferably, the Karanj oil is present in an amount ranging from 1 to 5 wt % of the total weight of the composition. More preferably, the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt % of the total weight of the composition. More preferably, the natural surfactant is present in an amount ranging from 30 to 60 wt % of the total weight of the composition. Even more preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt % of the total weight of the composition.
- According to another aspect of the present invention, there is provided a food product classified as ‘residue-free’ grown in the presence of an aqueous fungicidal composition comprising Karanj oil. Preferably, the composition further comprises fermented aloe vera extracts. Preferably, the composition further comprises fermented aloe vera extracts and a natural surfactant. More preferably, the Karanj oil is present in an amount ranging from 1 to 5 wt % of the total weight of the composition. More preferably, the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt % of the total weight of the composition. More preferably, the natural surfactant is present in an amount ranging from 30 to 60 wt % of the total weight of the composition. Even more preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt % of the total weight of the composition.
- According to another aspect of the present invention, there is provided a food product grown with an exposure to an aqueous fungicidal composition comprising Karanj oil. Preferably, the composition further comprises fermented aloe vera extracts. Preferably, the composition further comprises fermented aloe vera extracts and a natural surfactant. More preferably, the Karanj oil is present in an amount ranging from 1 to 5 wt % of the total weight of the composition. More preferably, the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt % of the total weight of the composition. More preferably, the natural surfactant is present in an amount ranging from 30 to 60 wt % of the total weight of the composition. Even more preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt % of the total weight of the composition.
- Organic food is defined by The Department for Agriculture and Rural Affairs (DEFRA) as: ‘Organic food is the product of a farming system which avoids the use of man-made fertilisers, pesticides; growth regulators and livestock feed additives. Irradiation and the use of genetically modified organisms (GMOs) or products produced from or by GMOs are generally prohibited by organic legislation.’
- Organic agriculture is similarly defined by DEFRA as: ‘Organic agriculture is a systems approach to production that is working towards environmentally, socially and economically sustainable production. Instead, the agricultural systems rely on crop rotation, animal and plant manures, some hand weeding and biological pest control.’
- The Clean Food Standard is a voluntary best-practice standard for food producers aimed at identifying fresh grown foods that meet exceptional standards of product purity. The standard extends the concept of purity embodied in national Clean Air and Clean Water regulations into the food arena. Specifically, the standard addresses four areas of potential concern: 1) pesticide residues, 2) food pathogens, 3) industrial contaminants and heavy metals; and 4) GMOs. The Clean Food Standard is intended to assist commercial, government and institutional buyers as well as consumers make better informed decisions about the fresh grown foods they purchase in terms of product purity considerations, thereby protecting the health and welfare of consumers by limiting their risk of exposure to potentially harmful residues and pathogens in the food supply. The Clean Food Standard is also intended to provide marketplace recognition to food producers who are voluntarily taking exceptional measures to protect the purity of the food they produce, thereby encouraging food producers to adopt pest management regimes, growing practices and food handling methods that minimize potential harm to human health and the environment from pesticide exposure, food pathogens, and other contaminants. Further, the Clean Food Standard is intended to serve as the basis for specific market claims, to be certified by recognized independent third parties who have no ownership or brokerage interest in the foods being certified, and who have no vested interest in the outcome of a given certification. The Clean Food Standard is also intended to define product purity requirements that can be used to inform the development of broader national standards for sustainable agricultural practices.
- In light of the Clean Food Standards, the definition of a Clean Food is ‘a fresh grown food product that complies with the requirements set forth in this Standard.’
- The “limit of detection” (LOD) is the limit below which a laboratory cannot confirm the presence of a specific residue in a given commodity. For pesticides, LODs are established in accordance FDA PAM II protocols for pesticides. For heavy metals, LODs are established in accordance with EPA protocols for ICP-MS. For other industrial chemicals, LODs are established in accordance with EPA 600-series protocols. The purity requirements of a Clean Food include synthetic pesticides with US EPA tolerances. Therefore, a clean food product shall be shown to be free of pesticide residues based on LODs for all registered synthetic pesticides with established tolerances. For those crops that have a pulp-only tolerance (e.g., honeydew, cantaloupe, banana), or for those crops that are tested for edible portion only in accordance with FDA PAM II protocols (e.g., corn, avocado), only the edible portion shall be required to be free of pesticide residues, based on the laboratory LOD. By or before 2010, all LODs must, at a minimum, meet de minimus risk levels.
- In Canada, the maximum residue limit for pesticides is assessed by considering that the residue definition upon which maximum residue limits (MRLs) are based typically includes the parent chemical and often includes corresponding metabolites. In some cases, a chemical may have multiple residue definitions, for example, between food crops and livestock commodities. The residue definition for all chemicals with established MRLs regulated under the Pest Control Products Act are listed in a table which reflects the content previously found in MRL listings under “Chemical Name of Substance”. MRLs established in Canada may be found using the Maximum Residue Limit Database on the Maximum Residue Limits for Pesticides webpage. The database allows users to search for established MRLs, regulated under the Pest Control Products Act, both for pesticides or for food commodities. There are over 400 chemicals listed on the Canadian website which produce at least one metabolite which can be of concern upon consumption of a foodstuff containing such.
- Bananas are never included in the list of the ‘Dirty Dozen’, the most pesticide and fungicide contaminated fruits and vegetables sold in stores. However, that is not to say that they are free of any synthetic chemicals, nor does it mean that farmers growing bananas are sheltered from the harmful effects of such chemicals.
- While it is commonplace knowledge that pesticides are used to protect crops against insects, weeds, fungi and other pests. It is also commonplace knowledge that pesticides are potentially toxic to humans and can have both acute and chronic health effects, depending on the quantity and ways in which a person is exposed. Some of the older, cheaper pesticides can remain for years in soil and water. These chemicals have been banned from agricultural use in developed countries, but they are still used in many developing countries. The greatest dirty secret of pesticides and fungicides is that the people who face the greatest health risks from exposure to pesticides are those who come into contact with them at work, in their home or garden.
- There are over 1000 known pesticides used around the world to protect food crops from damage or destruction by a variety of pests. Each pesticide has different properties and toxicological effects. The toxicity of a pesticide depends on its function and other factors. For example, insecticides tend to be more toxic to humans than herbicides. The same chemical can have different effects at different doses (how much of the chemical a person is exposed to). It can also depend on the route by which the exposure occurs (such as swallowing, inhaling, or direct contact with the skin).
- What is less known is that pesticides are among the leading causes of death by self-poisoning, in particular in low- and middle-income countries. Because of their inherent toxicity and due to the fact that they are deliberately spread in the environment, the production, distribution, and use of pesticides require strict regulation and control. Regular monitoring of residues in food and the environment is also required. The most at-risk population are people who are directly exposed to pesticides. This includes agricultural workers who apply pesticides, and other people in the immediate area during and right after pesticides are spread. The general population—who are not in the area where pesticides are used—is exposed to significantly lower levels of pesticide residues through food and water.
- Pesticides and fungicides can prevent large crop losses and will therefore continue to play a role in agriculture. However, the effects on humans and the environment of exposure to pesticides are a continuing concern.
- It is critical that the use of synthetic chemicals in the assistance of food production be limited as much as possible so that the benefits not only outweigh the inherent risks associated with the use of such products but preferably should provide farmers and people handling such products with a much safer workplace environment (storage, handling, disposal, etc.) than is currently required by the extremely lax regulations in many countries. It is important to be reminded of the fact that the use of pesticides to produce food, both to feed local populations and for export, should comply with good agricultural practices regardless of the economic status of a country. As such, farmers should limit, both for their own safety but also because of their critical contribution to the food chain the amount of pesticide used to the minimum necessary to protect their crops.
- It is also possible, under certain circumstances, to produce food without the use of synthetic pesticides. This is the ideal case, where the farmers can attend to their crops safely while being capable of producing large amounts of food both for their own families, for transactions in the local market as well as for exporting to other countries.
- According to a preferred embodiment of the present invention, the composition is sprayed on the ground close to a banana tree plant so as to soak the roots and prevent/reduce/destroy the presence of fusarium wilt on the plant. Preferably, the product is drenched around the root zone to manage the plant disease. It is hypothesized by the inventors that the mode of action of a composition according to a preferred embodiment of the present invention is by preventing the formation of spores and eventually the spread of fungus is managed.
- According to a preferred embodiment of the present invention, the use composition will produce a food product classified as ‘clean food’.
- According to a preferred embodiment of the present invention, the use composition will produce a food product classified as ‘residue-free food’ or ‘residue-free product’ or ‘residue-free food product’.
- According to a preferred embodiment of the present invention, the Karanj oil is present in an amount ranging from 1 to 5 wt. %. Preferably also, the fermented aloe vera extracts are present in an amount ranging from 40 to 60 wt. %. Preferably, the natural surfactant is present in an amount ranging from 30 to 60 wt. %. More preferably, the natural surfactant is present in an amount ranging from 35 to 45 wt. %.
- According to another aspect of the present invention, there is provided a use of the composition described herein, for the treatment, prevention and/or management of fusarium wilt.
- According to another aspect of the present invention, there is provided a method for the prevention, treatment and/or management of fusarium wilt on plants prone to such fungus, said method comprising the steps of:
-
- providing a fungicidal composition comprising karanj oil;
- applying said composition on said plants;
- wherein said step of applying is repeated as necessary and can be done until the day before harvest.
- According to another aspect of the present invention, there is provided a method for the stimulation of the growth of a plant prone to the fungus fusarium wilt, said method comprising the steps of:
-
- providing a fungicidal composition comprising karanj oil;
- applying said composition on said plants;
wherein said step of applying is repeated as necessary and can be done until the day before harvest. Preferably, said composition further comprises fermented aloe vera extracts. Preferably also, said composition further comprises a natural surfactant. Preferably also, said composition further comprises water as a solvent.
- According to a preferred embodiment of the present invention, the composition has both anti-fungal properties and growth stimulating properties, which while increasing the growth of the plant and it has shown to increase the plant survival rate to almost 95%.
- There are no known major fungicidal products which effectively manage Fusarium wilt in bananas. The economic impact caused by fusarium wilt is quite large and it leads to losses in the hundreds of millions of dollars per year. The composition according to a preferred embodiment of the present invention, costs less than synthetic fungicides and has practically no after-market costs (no clean-up costs, no lawsuits because of toxicity unlike some synthetic products, no water discharge control measures necessary, greater proportion of the land can be used, etc.). Moreover, it manages the disease effectively and has an added advantage of accelerating the growth of banana tree plants. It has been reported that the use of a composition according to the present invention has increased the yield of each banana tree by up to 20-25% more bananas as well as providing larger bananas than untreated or plants treated with chemical pesticides.
- Even organic bananas, which are grown using the organic guidelines can be treated with synthetic fungicide. The rules of application require covering the banana fruits with a bag and interrupting the spraying of the fungicide at least 14 days prior to the harvest. Moreover, it is important to note that despite the “organic” labelling the produce may still be exposed to synthetic fungicide (i.e. not even covered by a bag).
- According to a preferred embodiment of the present invention, the application of a composition of the present invention would allow a farmer to apply said composition on the bananas without having to cover them in a plastic bag. This has a three-fold advantage, less workforce necessary to cover the banana plants, no usage of plastic bags and subsequent disposal thereof and maintaining a clean food labelling standard.
- According to a preferred embodiment of the present invention, the application of a composition of the present invention would allow a farmer to have fewer dead banana tree leaves. Dead leaves due to infection from a fungi must be removed quickly to prevent the spreading of the fungal infections to other leaves and ultimately to the entire plant. The fact that such a composition provides the farmer with such an outstanding performance against fungal infections would allow him to employ fewer people whose sole job is to walk up and down the banana grove and cutting off infected leaves.
- According to a preferred embodiment of the present invention, the composition has no specific disadvantages in comparison to the synthetic fungicides being currently used. Nonetheless, it is preferable to take care when using the fungicide according to a preferred embodiment on plants by using appropriate eye protection and nose masks to prevent any potential damage.
- Testing to determine the absorption of fungicide into the flesh of bananas was conducted in order to eventually determine whether a natural fungicide would avoid such drawback. Testing was conducted at the University of Guelph Agriculture and Food Laboratory in order to assess the pesticide and fungicide content of a variety of bananas obtained on the shelves of a Canadian supermarket.
- Bananas obtained from six different sources (3 regulars and 3 organics) are labelled as #1 to #3 (for both regular and organic sources). The first series of testing involved assessing the content of ethylenebisdithiocarbamates (EBDC) in the flesh of the bananas purchased. Table #1 provides a summary of the results from the testing.
-
TABLE #1 Results of testing of banana flesh for presence of EBDC compounds Sample Test Results Banana #1 EBDC Screen Detected (ethylenebisdithiocarbamates < MQL) Banana #2 EBDC Screen Detected (ethylenebisdithiocarbamates < MQL) Banana #3 EBDC Screen Not detected Banana (organic #1) EBDC Screen Not detected Banana (organic #2) EBDC Screen Not detected Banana (organic #3) EBDC Screen Not detected EBDC's are measured as CS2 and reported as Zineb equivalent. EBDC MDL = 0.03 ppm, MQL = 0.05 ppm - The second series of testing by GC-MS/MS multiresidue screen (Method ID: TOPS-142) was done to assess the presence of pesticides (as well as their content and identity) in the flesh of the bananas purchased. Table #2 provides a summary of the results from the testing.
-
TABLE #2 Results of testing of banana flesh for presence of pesticides using a GC-MS/MS multiresidue screen (Method ID: TOPS-142) Sample Test Results Banana #1 Pesticide screen Detected Banana #1 Chlorpyrifos <MQL Banana #1 Myclobutanil 0.040 ppm Banana #1 Azoxystrobin 0.042 ppm Banana #1 bifenthrin <MQL Banana #2 Pesticide screen Detected Banana #2 Chlorpyrifos 0.011 ppm Banana #2 Azoxystrobin 0.0094 ppm Banana #2 bifenthrin <MQL Banana #3 Pesticide screen Detected Banana #3 Myclobutanil 0.089 ppm Banana #3 Azoxystrobin 0.034 ppm Banana #3 bifenthrin 0.073 ppm Banana (organic #1) Pesticide screen Not detected Banana (organic #2) Pesticide screen Not detected Banana (organic #3) Pesticide screen Detected Banana (organic #3) Tebuconazole <MDL Banana (organic #3) chlorpyrifos <MDL Notes: <MQL = Less than the minimum quantification limit. <MDL = Less than the minimum detection limit. Presence of the compound confirmed by GC-MS/MS but at less than the defined quantification or detection limit for that compound using this method. - The third series of testing by LC-MS/MS multiresidue screen (Method ID: TOPS-142) was done to assess the presence of pesticides (as well as their content and identity) in the flesh of the bananas purchased. Table #3 provides a summary of the results from the testing.
-
TABLE #3 Results of testing of banana flesh for presence of pesticides using a LC-MS/MS multiresidue screen (Method ID: TOPS-142) Sample Test Results Banana #1 Pesticide screen Detected Banana #1 Fenpropimorph <MQL Banana #1 Thiabendazole 0.018 ppm Banana #1 Fenpropidin <MDL Banana #2 Pesticide screen Detected Banana #2 Pyriproxyfen 0.0066 ppm Banana #2 Fenpropidin <MDL Banana #2 Fenpropimorph <MDL Banana #3 Pesticide screen Detected Banana #3 Pyriproxyfen 0.13 ppm Banana #3 Fenpropidin <MDL Banana #3 Fenpropimorph 0.018 ppm Banana #3 Pyrimethanil <MDL Banana #3 Spiroxamine (isomer 1) <MDL Banana (organic #1) Pesticide screen Detected Banana (organic #1) Fenpropidin <MDL Banana (organic #1) Fenpropimorph 0.0037 ppm Banana (organic #2) Pesticide screen Detected Banana (organic #2) Fenpropidin <MQL Banana (organic #2) Fenpropimorph <MQL Banana (organic #3) Pesticide screen Detected Banana (organic #3) Fenpropidin <MDL Banana (organic #3) Fenpropimorph <MDL Notes: <MQL = Less than the minimum quantification limit. <MDL = Less than the minimum detection limit. Presence of the compound confirmed by GC-MS/MS but at less than the defined quantification or detection limit for that compound using this method. - The testing data is a clear indication that despite all of the best efforts deployed, even bananas labelled ‘organic’ yield fruit which flesh contains pesticide residues. The above testing is proof that a residue-free product, such as a banana has still yet to be achieved on large monocultures as those are prone to infestations of insects, fungus, parasites or the like.
- While the foregoing invention has been described in some detail for purposes of clarity and understanding, it will be appreciated by those skilled in the relevant arts, once they have been made familiar with this disclosure that various changes in form and detail can be made without departing from the true scope of the invention in the appended claims.
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