MXPA99002610A - Process to control and kill pathogenic small life forms, particularly insects and worms - Google Patents

Abstract

Control of human-, animal- and plant-pathogenic small lifeforms using percarboxylic acids Control of human-, animal- and plant-pathogenic small lifeforms (i.e. insects and worms) comprises introduction of a liquid control agent comprising aqueous 1-6C percarboxylic acids, to surfaces and/or water.

Description

PROCEDURE FOR COMBATING AND DESTROYING LIVE PATHOGENIC LIVING BEINGS, ESPECIALLY INSECTS AND WORMS DESCRIPTION OF THE INVENTION The invention is directed to a method for combating and destroying pathogenic small living beings, especially insects and worms. Since always humans and animals as well as plants have been plagued or damaged by different small pathogenic living beings of the type of insects and worms, as examples can be mentioned mosquitoes, such as mosquitoes anopheles transmitting malaria or malaria, and larvae of Quitostomas (leeches) that cause the distomatosis. There have been no efforts to eradicate malaria.

So before to combat mosquitoes was sprayed DDT insecticide in large quantities. The good effect however damaged the ecological balance, in such a way that the use of DDT was prohibited. The use of chlorine disintegrating agents such as sodium hypochlorite was also tested. Also with these agents they have not been able to be used, since their handling is problematic and that when used in shallow waters inevitably leads to the undesired formation of salts and organic chlorine compounds. In tropical and subtropical lands, it is also attempted to reduce the surface tension of shallow waters through the use of surfactants, in order to avoid the retention of ref.29718 mosquito larvae under the surface of the water. The disadvantage of this technique, which is responsible for its limited application, is that mosquitoes could partially escape from the area of application of the surfactant and / or that large quantities of surfactants are required. From the patent of US 5,393,781 it is known to combat lae oetrae rayadae in cooling circuits using peracetic acid solution. This document does not mention any other class of animals that can be combated with peracetic acid. The use of peracetic acid as a microbicide to fight bacteria ^ virue, yeast algae and fungi has long been known. The task of the invention is to present a method for combating and destroying disease-causing and / or problematic insects, which do not present the disadvantages only very limitedly of the agents used hitherto. The task is solved by means of a procedure to combat and eliminate small living organisms that are pathogenic for humans, animals and plants, of the type of insects and worms by means of the application of a liquid agent on surfaces and / or in shallow waters , the process is characterized in that a percarboxylic acid solution containing one or more percarboxylic acids having from 1 to 6 carbon atoms is used as the agent. The dependent claims refer to preferred embodiments. In the combat of small living beings, under the term "combat" is meant a reduction of the population, in the case of small living organisms that are pathogenic for humans and animals of the ineectoe and gueanoe class. The method according to the invention is directed in particular at combating pathogenic insects, in which their larvae are destroyed in their preferred life zone. The preferred life zone of the larvae is a moist medium, especially shallow stagnant water, such as sea coasts, ponds, rice fields, marshes and the l Analogously, pathogenic worms can be combated, the use of shallow stagnant waters being of high importance here. Examples of insects that are found in tropical and subtropical regions and which must be combated according to the invention are mosquitoes, flies and bed bugs, which by means of stinging or contact transmit unicilular organisms, pinworms and viruses. and that can cause diseases, the anopheles mosquito transmits plasmodiums during the bite that cause malaria and the phlebotomic mosquitoes transmit the leiehmaniaeie that causes the Kala-Azar disease in the skin; the tse-tse fly that transmits triponosomes, which cause the fever of the dream; certain mosquitoes transmit the viruses that cause the fever known as dengue; other mosquitoes transmit to the promotoree of yellow fever; In addition, flies that live in the rice areas that cause Japanese encephalitis can be mentioned. Under the pathogenic worms that have combatiree, the quitostomas (leeches) that cause the distomatosis are of interest. The infection takes place through contact of humans with fresh or wastewater, in which the larvae of chitoetomas or hirudineoe are found. To treat larvae, it is advantageous to treat shallow stagnant waters, especially the coastal zone with a percarboxylic acid solution. The pinworms and the pathogenic teniae for the pecee can also be combated in an analogous manner. To combat larvae of eg worms that live close to the soil surface, such as anchitostomas, which can lead to hookworm due to contact with the skin, the percarboxylic acid solution can be applied at an effective concentration on the soil. The effective concentration of (e) percarboxylic acid (s) in the medium to be treated is usually in the range of 1 to 5000 ppm, especially in the range of 10 to 500 ppm. The treatment of surfaces of the soil or on the surface of the body of water, can be done by means of sprinklers customary in agriculture, such as spray guns, carts with wide arms provided with nozzles. For the treatment of shallow water surface layers, the percarboxylic acid solution can be applied directly in the water and distributed by means of suitable mixing devices, such as pumps or ship turbines. The gercarboxylic acids used, which may also be referred to as peroxycarboxylic acids, can be monoperoxy monocarboxylic acids with 1 to 6 carbon atoms, monoperoxy- or diperoxy-dicarboxylic acids with 4 to 6 carbon atoms or monoperoxy hydroxycarboxylic acids with of 2 to 6 carbon atoms and 1 or 2 hydroxyl groups. Examples are performic acid, peracetic acid, perpropionic acid, mono- and diperoxysuccinic acid, mono- and diperoxyglutaric acid, peroxylactic acid, peroxy glycolic acid and peroxytartaric acid. Preferred are peracetic acid, performic acid as well as solutions containing performic acid and perfórmics acid. In general they contain the solutions hydrogen peroxide required for the preparation as well as (e) carboxylic acid (e) which are base of the percarboxylic acid (s). This is how the solutions contain at least one mineral acid catalyst, which accelerates the equilibrium. The highest concentration of peracid, which can be obtained during the reaction of hydrogen peroxide with an aqueous carboxylic acid with a quantitative proportion of the reaction partner, is the equilibrium concentration. Accordingly, they are used in or near the equilibrium state or solutions obtained by dilution with water. The undiluted solutions used advantageously contain from 0.1 to about 5 moles, especially 0.2 to 2 moles, of percarboxylic acid. According to a preferred embodiment, a solution of percarboxylic acid, the ortho-orthophoric acid necessary for the preparation, the pyrophosphoric acid and / or the polyphosphoric acid of the formula Hn + 2Pn03n + 1, wherein n represents an equal whole number is used at 3 or greater than 3, in particular at 10. The concentration of these types of phosphoric acids is mainly found in the region of about 0.1 to about 3% by weight, especially about 0.5 to 1% by weight. It is preferred that such solutions contain as percarboxylic acid, peracetic acid or perfric acid or carboxylic acid arrivals, wherein said combination is preferably formed in situ before use., for example by mixing a peracetic acid solution and a formic acid source, such as formic acid or a water-soluble formate, and allowing it to stand for a few minutes up to a few hours. As an advantage of this type of solution, it should be considered that the phosphoric acid component when adding the percarboxylic acid solution in the medium to be treated, as in special shallow water, is more advantageous in comparison with sulfuric acid from the ecological point of view. normally used. An advantage that occurs with all percaboxylic acid solutions, which contain a combination of peracetic and performic acid, is the high effectiveness in comparison to the solutions that only contain peracetic acid as percarboxylic acid. The solutions with the two percarboxylic acids mentioned are also more advantageous compared to those solutions, which as percarboxylic acids only contain performic acid, because the preparation of the latter for safety and handling reasons is problematic. According to another embodiment, the percarboxylic acid solution used can also contain one or more surfactants. The teneoactivoe are easily biodegradable, like those already used to fight insects. In particular, it is anionic and nonionic teneoactives, such as, for example, sugar teneoactives, alkanol sulphates, ethoxylated alcohols. The concentration of surfactants in the percarboxylic acid solution for spraying or applying directly in the shallow water is selected in such a way that an effect is obtained as a consequence of the effect of the (e) percarboxylic acid (s), such an effect obtained with a concentration in the range of about 0.1% to about 10% by weight. The use according to the invention of one or more solutions containing percarboxylic acids and the process thereof differ from the known use of those solutions for combating microorganisms and "striped oysters" by means of the target, that is, insects and pathogenic worms. The new use allows to fight insects and pathogenic worms in a more effective and technically simpler way, in which the larvae are destroyed. The agent used, after the percarboxylic acid could be made effective, is biologically degraded in a short time, in such a way that the presence of ecological problems is not feared. Already with the selection of the concentration of percarboxylic acid (s) and hydrogen peroxide in a solution for spraying, it can be observed that higher concentrations can also be phytopathogenic. The invention will be clarified with the help of the following examples. Example 1 Combat of black mosquito larvae: The water in which 10 larvae were found was inoculated by means of a peracetic acid solution in equilibrium with a content of 5% by weight of peracetic acid (PES) and 27% of peroxide. hydrogen with SO ppm PES. In the course of 12 hours after the inoculation 10 larvae died; The remaining animals showed symptoms that corresponded to doloroeas reactions in the branchial tube (coiling and nervous movements). Example 2 Water with 10 larvae of the black mosquito was inoculated by means of an equilibrium solution of peracetic acid with a content of 5% by weight of peracetic acid and 27% by weight of hydrogen peroxide and additionally 3% by weight of "Hastapur" S30 (30% by weight aqueous solution of a mixture of secondary alkane sulphonates from Hoechst AG) with 50 ppm PES.On the course of 12 hours after inoculation, 10 larvae died. eintomae shown in Example 1. Comparative Example 1 Water with a population of black mosquito larvae similar to examples 1 and 2 was inoculated with a 50 wt% solution of hydrogen peroxide with 1500 ppm H202. of the larvae Example 3 Combat of cachipolla larvae: the water with 10 larvae was inoculated by means of a peracetic acid in equilibrium with a content of 5% by weight of peracetic acid and 27% by weight of peroxide of hydrogen with 7 ppm PES. All the larvae died after 8 hours. Example 4 Combat of red mudworm (tubificetene): The water in which the animals studied were found was inoculated by means of a balanced peracetic acid solution, containing 2% by weight of peracetic acid and 48% by weight of hydrogen peroxide with 30 ppm PES. All the animals died. Comparative Example 2 In a manner analogous to Example 4, the water containing the red mudworms was inoculated with 800ppm of a 50% solution of hydrogen peroxide. None of the animals died. Example 5 A population of mosquito red larvae (chironimids) was inoculated after inoculation with 400 ppm of 5% peracetic acid solution in equilibrium (5% by weight PES, 27% by H202). All larvae die within 2 hours. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers.

Claims (9)

CLAIMS Having described the invention as above, property is claimed as contained in the following:

1. - Procedure to combat and destroy small pathogenic living beings of humans, animals and plants of the type of insects and worms, by means of the application of a liquid agent surfaces and / or in shallow waters, characterized as a combat agent is used a solution of percarboxylic acid containing one or more percarboxylic acids with 1 to 6 carbon atoms.

2. Method according to claim 1, characterized in that a solution containing peracetic acid and / or perfrmico is used.

3. Process according to claim 2, characterized in that an aqueous solution of (e) percarboxylic acid (s) containing carboxylic acid (s) and hydrogen peroxide serving as a base or acid (s) is used. s) percarboxylic (s), especially an aqueous solution of percarboxylic acid at or near equilibrium or a dilute solution prepared before use.

4. Method according to one of claims 1 to 3, characterized in that the percarboxylic acid solution to be used per 1, contains 0.1 to 5 moles, in particular 0.2 to 2 moles of percarboxylic acid (s).

5. Process according to one of claims 1 to 4, characterized in that the percarboxylic acid solution to be used contains a mineral acid from the group of orthophosphoric acid, pyrophosphoric acid and polyphosphoric acid of the formula Hn + 2PnOJn + 1, wherein n represents an integer equal to 3 or greater than 3, especially in an amount of 0.1 to 3% by weight.

6. Process according to one of claims 1 to 5, characterized in that the percarboxylic acid solution additionally contains one or more surfactants.

7. Process according to claim 6, characterized in that the percarboxylic acid solution contains 0.1 to 10% by weight of surfactants, especially surfactants from the group of easily biodegradable anionic or nonionic surfactants.

8. - Method according to one of claims 1 to 7, characterized in that to combat insects their larvae are destroyed, for which the solution of percarboxylic acid is sprayed on the surface of a body of water containing the larvae or because adds to the body of water and is distributed near the surface.

9. - Procedure according to. one of claims 1 to 8, characterized in that the percarboxylic acid solution is sprayed or applied on or in a medium containing pathogenic small living beings, especially a body of water, in such a way that the concentration of percarboxylic acid is found. in the area where these small beings live from 1 to 5000 ppm, especially 10 to 500 ppm.