WO2023161674A1 - Formulation de gel répulsif comprenant de l'huile de menthe et du citronellol, et procédés de préparation associés à des fins de gestion de charançons du palmier - Google Patents

Formulation de gel répulsif comprenant de l'huile de menthe et du citronellol, et procédés de préparation associés à des fins de gestion de charançons du palmier Download PDF

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Publication number
WO2023161674A1
WO2023161674A1 PCT/IB2022/051663 IB2022051663W WO2023161674A1 WO 2023161674 A1 WO2023161674 A1 WO 2023161674A1 IB 2022051663 W IB2022051663 W IB 2022051663W WO 2023161674 A1 WO2023161674 A1 WO 2023161674A1
Authority
WO
WIPO (PCT)
Prior art keywords
gel formulation
repelling
repelling gel
oil
citronellol
Prior art date
Application number
PCT/IB2022/051663
Other languages
English (en)
Inventor
Arachchi Devayalage Nishantha Thissa KUMARA
Thellambura Bambarendage Kasun Hasitha NERANJANA
Original Assignee
South Eastern University Of Sri Lanka
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by South Eastern University Of Sri Lanka filed Critical South Eastern University Of Sri Lanka
Priority to PCT/IB2022/051663 priority Critical patent/WO2023161674A1/fr
Publication of WO2023161674A1 publication Critical patent/WO2023161674A1/fr

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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
    • 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
    • A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
    • 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
    • A01N65/40—Liliopsida [monocotyledons]
    • A01N65/44—Poaceae or Gramineae [Grass family], e.g. bamboo, lemon grass or citronella grass
    • 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
    • A01P17/00—Pest repellants

Definitions

  • the present disclosure relates to a pest control formulation, and more particularly, relates to a repelling gel formulation for pest control including mint oil and citronellol, and methods of preparing the repelling gel formulation, particularly against palm weevils.
  • Red palm weevil (Rhynchophorus ferrugineus) is a widely distributed insect pest around the world, particularly in tropical and sub-tropical areas. It is a serious pest causing fatal damage to a wide range of palm species. It has been estimated that 10-15 % of young coconut palms in Sri Lanka are lost annually due to the attack by the red palm weevil (RPW). RPW has become widespread owing to the ability of the insect pest to its quick adaptability to various environmental conditions.
  • Estate sanitation and early detection were commonly used methods for the management of the weevils.
  • Estate sanitation includes avoiding making wounds on trees, dressing wounds with coal tar or burnt engine oil, removing hanging leaves, covering exposed roots and basal fissures, disposing/destroying coconut and toddy palm trunks, and burning damaged dead palms. These methods require a lot of constant monitoring and a considerable effort.
  • Certain other conventional methods involve the use of chemical pesticides, like monocrotophos. However, these pesticides suffer from drawbacks in that they are harmful to the environment by poisoning wildlife and are toxic to humans.
  • a repelling gel formulation for pest control includes active ingredients including mint oil; and citronellol.
  • a weight ratio (w/w) of the mint oil to the citronellol is in a range of 1 :1 to 5:1.
  • the repelling gel formulation further includes a dispenser matrix, including the active ingredients, adapted to release the active ingredients into an atmosphere at a sustained rate.
  • the repelling gel formulation includes at least one inert ingredient selected from a group consisting of emulsifier, coagulant, antioxidant, and a solvent.
  • a method of making the repelling gel formulation includes blending the mint oil, and the citronellol to form a blend solution to form the active ingredients.
  • a weight ratio of the mint oil to the citronellol is in a range of 1: 1 to 5: 1.
  • the method further includes dissolving the blend solution in a solvent, in presence of an emulsifier, to obtain a first mixture.
  • the method further includes adding an antioxidant to the first mixture to obtain a second mixture, and cross-linking the second mixture within a dispenser matrix to obtain the repelling gel formulation.
  • FIG. 1 is a schematic flow diagram of a method of making a repelling gel formulation, according to one embodiment of the present disclosure
  • FIGS. 2A and 2B are pictorial images depicting a coconut palm killed by RPW, according to one embodiment of the present disclosure
  • FIG. 3 is a pictorial image depicting tunnels caused by the RPW, in a palm tree, according to one embodiment of the present disclosure
  • FIG. 4A is a pictorial image depicting the repelling gel formulation, according to one embodiment of the present disclosure.
  • FIG. 4B is a pictorial image depicting the repelling gel formulation in a dispenser gel, according to one embodiment of the present disclosure
  • FIG. 4C is a pictorial image depicting a packaged product including the repelling gel formulation in the dispenser gel, according to one embodiment of the present disclosure
  • FIG. 5 is a pictorial image depicting application of the repelling gel formulation, for management of the RPW, according to one embodiment of the present disclosure.
  • the terms “approximately,” “approximate,” “about,” and similar terms generally refer to ranges that include the identified value within a margin of 20%, 10%, or preferably 5%, and any values therebetween.
  • Embodiments of the present disclosure are directed to repelling gel formulation for pest control.
  • the repelling gel formulation or herein referred to as a “formulation” includes essential oils, namely, mint oil, and citronellol, which when used in defined weight ratios demonstrate an insecticidal activity against agricultural pests.
  • the pest is a weevil belonging to family Curculionidae.
  • the weevil is a red palm weevil (RPW).
  • RPW red palm weevil
  • the description herein refers to use of the formulation for the management of RPW, aspects of the present disclosure may be adapted for use against other palm weevils or beetles as well.
  • the insecticidal potential of the formulation was evaluated against RPW, and the results indicate high effectiveness in RPW population management.
  • the essential oils of the present disclosure are safe, nontoxic, and overcome, with high efficacy at low concentrations, thereby making the formulation cost-effective.
  • the repelling gel formulation includes active ingredients having mint oil; and citronellol.
  • a weight ratio (w/w) of the mint oil to the citronellol is in a range of 1: 1 to 5: 1.
  • the main ingredient of the mint oil which imparts pesticidal action against the weevils is menthol.
  • Yet another ingredient critical in imparting pesticidal action against the weevils is menthone.
  • the mint oil includes a combination of menthol and menthone.
  • the mint oil and the citronellol are concentrated, hydrophobic liquids obtained from plants.
  • the mint oil, including a combination of menthol and menthone has a weight percentage in a range of 5-10% of the total volume of the formulation.
  • the citronellol has a weight percentage of 2-5% of the total volume of the formulation.
  • the active ingredients have a weight percentage of 7-15% of a total volume of the repelling gel formulation.
  • the repelling gel formulation further includes a dispenser matrix including the active ingredients.
  • the dispenser matrix includes a polymer, and a cross-linking agent.
  • the polymer is at least one selected from a group consisting of carrageenan, xanthum gum, guar gum, polyvinyl alcohol, or any combination thereof.
  • the polymer is carrageenan.
  • the cross-linking agent is a chloride salt.
  • the chloride salt is potassium chloride, calcium chloride, or a combination thereof.
  • the polymer is in an amount ranging from 2.5-5 % of the total weight of the formulation.
  • the cross-linking agent is in an amount ranging from 0.02 to 0.025 % of the total volume of the formulation.
  • the dispenser matrix includes active ingredients dispersed within it and is adapted to release the active ingredients into an atmosphere at a sustained rate.
  • the dispenser matrix is in the form of a gel.
  • the repelling gel formulation further includes at least one inert ingredient selected from a group including emulsifier, coagulant, antioxidant, and a solvent.
  • the emulsifier is at least one selected from a group consisting of polysorbate 20, polysorbate 65, polysorbate 80, and glycerin, polyglycerol esters (PGE), or any combination thereof.
  • the emulsifier is polysorbate 80, and is in an amount ranging from 0.001 to 0.005% of the total volume of the repelling gel formulation.
  • the solvent is at least one selected from a group consisting of canola oil, palm oil, coconut oil, sunflower oil, or any combination thereof.
  • the solvent is sunflower oil, and is in an amount ranging from 0.25 to 0.5% of the total volume of the repelling gel formulation.
  • antioxidant is butylated hydroxytoluene (BHT) or butylated hydroxyanisole (BHA) and is in an amount ranging from 0.005 to 0.01% of the total volume of the repelling gel formulation.
  • the coagulant is a chloride salt.
  • the chloride salt is potassium chloride, calcium chloride, or a combination thereof.
  • the at least one chloride salt in an amount ranging from 0.02 to 0.025 % of the total volume of the repelling gel formulation.
  • the repelling gel formulation includes menthol, menthone, or it’s isomers thereof is in an amount ranging from 5 to 10 % of a total volume of the repelling gel formulation
  • citronellol is in an amount ranging from 2 to 5 % of the total volume of the repelling gel formulation
  • carrageenan gel powder is in an amount ranging from 2.5 to 5 % of the total volume of the repelling gel formulation
  • polysorbate 80 is in an amount ranging from 0.001 to 0.005 of the total volume of the repelling gel formulation
  • sunflower oil is in an amount ranging from 0.25 to 0.5 % of the total volume of the repelling gel formulation
  • BHT is in an amount ranging from 0.005 to 0.01 mg of the total volume of the repelling gel formulation
  • at least one chloride salt in an amount ranging from 0.02 to 0.025 % of the total volume of the repelling gel formulation.
  • a method of treating a plant infested with a pest is provided.
  • the pest is RPW.
  • the plant is a palm plant.
  • the palm plant can be a coconut palm, a date palm, or ornamental palm etc.
  • the method includes administering an effective amount of the repelling gel formulation.
  • a method of administration includes applying the repellence gel formulation to the susceptible palms at the rate of one gel per palm for pushing out (repelling) the weevils to prevent infestation.
  • the formulation can be placed near any plant, it is preferred to place the repellence gel formulation on a middle of petiole of the young palms.
  • the dispenser matrix periodically releases the active ingredients of the formulation at a sustained rate into the atmosphere.
  • the weevils are repelled by the volatized active ingredients, thereby preventing infestation of the plant.
  • a new repelling gel formulation is placed in each palm plant, after about 1-2 months, once the active ingredients are completely volatized in the atmosphere, and if the formulation is no longer effective.
  • FIG. 1 a schematic flow diagram of the method 100 of forming the repelling gel formulation is illustrated.
  • the order in which the method 100 is described is not intended to be construed as a limitation, and any number of the described method steps may be combined in any order to implement the method 100. Additionally, individual steps may be removed or skipped from the method 100 without departing from the spirit and scope of the present disclosure.
  • the method 100 includes blending mint oil, and citronellol to form a blend solution of active ingredients.
  • a weight ratio of the mint oil to the citronellol is in a range of 1 : 1 to 5 : 1.
  • the mint oil includes a combination of menthol and menthone.
  • the mint oil, including menthol and menthone has a weight percentage in a range of 5-10% of the total volume of the formulation.
  • the citronellol has a weight percentage of 2-5% of the total volume of the formulation.
  • the method 100 includes blending the mint oil and the citronellol, manually.
  • the method 100 includes dissolving the blend solution in a solvent, in presence of an emulsifier, to obtain a first mixture.
  • the solvent is at least one selected from a group consisting of canola oil, palm oil, coconut oil, sunflower oil, or any combination thereof.
  • the solvent is sunflower oil.
  • the emulsifier is at least one selected from a group consisting of polysorbate 20, polysorbate 65, polysorbate 80, glycerin, polyglycerol esters (PGE), or any combination thereof.
  • the emulsifier is polysorbate 80.
  • the method 100 includes adding an antioxidant to the first mixture to obtain a second mixture.
  • the antioxidant is BHT.
  • the method 100 includes cross-linking the second mixture within a dispenser matrix to obtain the repelling gel formulation.
  • the method 100 includes cross- linking the second mixture within the dispenser matrix at a temperature range of 45-55 °C to obtain the repelling gel formulation.
  • the dispenser matrix is prepared by stirring continuously, a polymer and optionally a cross-linking agent, in water at a temperature range of 70-90 °C to form a homogenous solution.
  • the polymer is at least one selected from a group consisting of carrageenan powder, xanthum gum, guar gum, polyvinyl alcohol, or any combination thereof.
  • the polymer is carrageenan powder.
  • the cross-linking agent is a chloride salt. The chloride salt is potassium chloride, calcium chloride, or a combination thereof. Further, cooling the homogenous solution to a temperature range of 45-55 °C to obtain the dispenser matrix.
  • FIGS. 2A and 2B are pictorial images depicting the coconut palm, killed by RPW.
  • a death of the plant begins when the eggs of the weevils are placed individually on places of pruning and wounds in the palm (coconut palm/date palm). The eggs are hatched into larvae, which are considered harmful, where they feed on the contents of the trunk of the palm, thereby leaving tunnels (FIG. 3) to reach the head area of tree, leading to death of the palm.
  • the formulation was prepared by mixing the following ingredients in defined weight percentages, as provided in Table 1.
  • Example 2 Process of preparing the formulation
  • a 5% solution of the active ingredients including mint oil (having menthol and menthone) and citronellol were mixed in sunflower oil, in the presence of polysorbate 80, to obtain a first mixture.
  • An antioxidant, BHT was added to the first mixture to obtain a second mixture.
  • a 5% solution of carrageenan powder was prepared by dispersing carrageenan in a minimum quantity of water (about l/4 th the volume of water) with continuous stirring. A remaining 3/4 th water was boiled to 80 °C and was mixed to the carrageenan powder, in the presence of a chloride salt, to obtain the carrageenan solution.
  • the carrageenan solution was cooled down to 50 °C and was slowly added to the second mixture to obtain the repellence gel formulation.
  • the formulation was further poured into molds (FIG. 4A), and the formulation was allowed to settle at room temperature to form a gel.
  • the gel was further packaged (FIG. 4B) and labeled (FIG. 4C) for use against weevils.
  • the RPW are repelled by causing the active ingredients to volatilize, thereby preventing infestation of the plant.
  • FIG. 5 The use of pesticidal compositions of the present invention generally results in 90-100% mortality on contact and provides equivalent fumigant action for extended periods of time (about 30 days).
  • the present disclosure provides a repelling gel formulation including essential oils like citronella and mint oil, which when used in defined ratios imparts insecticidal activity against weevils, particularly, red palm weevil.
  • the formulation of the present disclosure is safe, and environmentally friendly overcoming the drawbacks associated with the use of synthetic pesticides. Also, the use of a combination of citronellol and mint oil makes it harder to develop resistance towards RPW. No elaborate machinery or equipment is required to prepare the formulations of the present disclosure, making the entire process cost-effective. The formulation is effective for about a period of a month (in dry conditions), obviating the need for constant monitoring.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
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  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Plant Pathology (AREA)
  • Dentistry (AREA)
  • Agronomy & Crop Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Natural Medicines & Medicinal Plants (AREA)
  • Biotechnology (AREA)
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  • Dispersion Chemistry (AREA)
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Abstract

L'invention concerne une formulation de gel répulsif, un procédé de préparation, et le procédé d'application de champ associé à des fins de gestion de charançons rouges du palmier (RPW). La formulation de gel répulsif comprend un principe actif possédant de l'huile de menthe et du citronellol, un rapport en poids (p/p) de l'huile de menthe sur le citronellol se trouvant dans une plage de 1:1 à 5:1. La formulation de gel répulsif comprend en outre une matrice de distributeur comprenant le principe actif, et au moins un ingrédient inerte sélectionné dans un groupe constitué par un émulsifiant, un coagulant, un antioxydant et un solvant. La formulation de gel répulsif de la présente divulgation trouve une application dans la lutte antiparasitaire, en particulier contre les Rhynchophorus ferrugineus Olivier, RPW, au sein de plantations de noix de coco et de palmiers dattiers. La présente divulgation est écologique et non toxique, et repousse 100 % des RPW des plantations. La divulgation peut également être utilisée avec d'autres procédés de gestion et dans un programme de lutte intégrée contre les organismes nuisibles (IPM).
PCT/IB2022/051663 2022-02-25 2022-02-25 Formulation de gel répulsif comprenant de l'huile de menthe et du citronellol, et procédés de préparation associés à des fins de gestion de charançons du palmier WO2023161674A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2022/051663 WO2023161674A1 (fr) 2022-02-25 2022-02-25 Formulation de gel répulsif comprenant de l'huile de menthe et du citronellol, et procédés de préparation associés à des fins de gestion de charançons du palmier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2022/051663 WO2023161674A1 (fr) 2022-02-25 2022-02-25 Formulation de gel répulsif comprenant de l'huile de menthe et du citronellol, et procédés de préparation associés à des fins de gestion de charançons du palmier

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050069568A1 (en) * 2002-03-20 2005-03-31 Hallahan David L. Insect repellent compounds
US20070224232A1 (en) * 2006-03-27 2007-09-27 Jeffrey Sherwood Composition and method to repel insects
US20120039973A1 (en) * 2010-08-11 2012-02-16 Paul Grlica Composition and method of time releasing essential oils for animal repellency and pesticide use
WO2013050967A1 (fr) * 2011-10-04 2013-04-11 0903608 B.C. Ltd. Formulations de lutte contre les nuisibles et leurs procédés de fabrication et d'utilisation
US20200221732A1 (en) * 2019-01-11 2020-07-16 Novus International, Inc. Essential oil particles with improved stability and compositions thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050069568A1 (en) * 2002-03-20 2005-03-31 Hallahan David L. Insect repellent compounds
US20070224232A1 (en) * 2006-03-27 2007-09-27 Jeffrey Sherwood Composition and method to repel insects
US20120039973A1 (en) * 2010-08-11 2012-02-16 Paul Grlica Composition and method of time releasing essential oils for animal repellency and pesticide use
WO2013050967A1 (fr) * 2011-10-04 2013-04-11 0903608 B.C. Ltd. Formulations de lutte contre les nuisibles et leurs procédés de fabrication et d'utilisation
US20200221732A1 (en) * 2019-01-11 2020-07-16 Novus International, Inc. Essential oil particles with improved stability and compositions thereof

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