JPH0723281B2 - Liquid pesticide composition - Google Patents

Description

TECHNICAL FIELD AND BACKGROUND OF THE INVENTION The present invention relates to liquid compositions of carbamate or organic phosphate pesticides.

The agrochemical composition can be prepared in the form of a liquid agent, dust agent, powder agent, gel agent, paste agent, solid agent and the like. In a composition containing an active ingredient of a certain kind, its dosage form depends on the user's requirements (often related to the application method) and the physical and chemical properties of the active ingredient. It will be decided in consideration.

In particular, liquid compositions are often easier to handle and safer than dusts and powders. There are various types of liquid compositions, examples of which include solutions, emulsions, emulsifiable concentrates, suspensions, and the like, and other types of liquid compositions can also be used. The carrier or diluent solvent used in these liquid compositions determines the dosage form (eg, solution or emulsion) of the composition. However, in the case of liquid pesticide compositions applied by spraying, it is preferred to dissolve the pesticide in a liquid carrier to make the composition. Furthermore, it is important that the liquid composition in this case can be mixed with other pesticides and pesticide compositions without any adverse effects. The ideal liquid carrier is that it has good storage stability, can be mixed with other products, has good stability when applied, and has the property of preventing crystallization and gelation of pesticide components in liquid. Such a liquid carrier is very preferable (the crystallization or gelation described above may change the concentration of the pesticide component in the liquid agent and may cause clogging of the spraying device).

The present invention generally relates to a liquid composition containing a pesticide, and examples of this pesticide include organic phosphate-based and carbamate-based pesticides, but the composition of the present invention contains methomyl [ie N-[(methylcarbamoyl ) Oxy] thioacetimidic acid methyl ester] and organic phosphate pesticides such as monocrotophos [ie diethyl (E) -1-methyl-2 (methylcarbamoyl) vinyl phosphate]. Especially useful.

Currently, carbamate insecticides are commercially available in the form of compositions, which are commercially available, for example 15-35% w / w active ingredient.
v, methanol or other alcohol 60-85% w / v, and water up to 15%. This standard composition is applied according to the high-volume, medium-volume or low-volume application method or after mixing with one or more other pesticides.

These pesticides can be applied to large areas of agricultural land in the form of airborne sprays from airplanes.

In recent years, application from the air has increased, and this is often done with specific equipment according to the minimal volume application method. Therefore, in this case, a relatively small amount of the high concentration pesticide composition is used (previously, a large amount of the low concentration pesticide composition was used). The particular device has a high-speed rotating mesh drum through which a predetermined amount (accurately metered amount) of mist of atomized droplets of the same size can be sprayed.

However, standard compositions containing carbamate insecticides such as methomyl are those containing methanol, or methanol and water, which present problems when sprayed using a microvolume sprayer. Of.
That is, under certain conditions, the insecticide crystallizes in the equipment and deposits the insecticide crystals in the rotating mesh drum, blocking the eyes of the mesh and thus preventing proper operation of the equipment. It has been found that there are cases. Therefore, the mesh drum must be washed frequently.

Similar problems have been found to occur when using other insecticides such as organic phosphates.

It is therefore an object of the present invention to provide a novel liquid composition in which the problem of crystallization of the pesticide from the liquid carrier does not occur at the time of extremely small volume spraying or the problem is substantially improved. It is to be. Another object is to provide a novel liquid composition which can be used advantageously in other application methods, has good storage stability and is also miscible with other insecticide compositions.

Structure of the Invention The present invention includes at least one alkyl ether solvent of mono- or di-ethylene or propylene glycol (abbreviation: glycol solvent), at least one alkanol solvent, N-methyl-2-pyrrolidinone, and dimethylformamide. And a dimethylacetamide-containing liquid carrier containing at least one dipolar-neutral solvent selected from the group consisting of dimethylacetamide, and at least one carbamate-based or organic phosphate-based agrochemical dissolved in the liquid carrier. It relates to a composition.

This composition is preferably the pesticide 50-500 g /, glycol solvent 10-750 g /, alkanol solvent 50-500 g /
And the polar-neutral solvent 10-750 g /.

Although various pesticides described above can be used in the present invention, a particularly useful pesticide is a carbamate-type insecticide having a structure related to the alkaloid huisostigmine, an example of which is carbaryl (1-naphthyl-N- Methyl-carbamate), carbofuran (2,3-dihydro-2,2
-Dimethyl-7-benzofuranyl-N-methylcarbamate), propoxa- (2-isopropylphenyl-N)
-Methyl carbamate), dioxacarb [O- (1,3
-Dioxolan-2-yl-phenyl-N-methylcarbamate], bendiocarb (2,2-dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate), aldicarb [2-methyl-2- (Methylthio)
-Propionaldehyde-O-methylcarbamoyl-oxime], methomyl [S-methyl-N- (methylcarbamoyloxy) -thio-acetamidate], oxamyl [S-methyl-1-dimethylcarbamoyl-N-
[(Methyl-carbamoyl) oxy] -thioformamidate], pirimicarb (2-dimethylamino-5,6-
Dimethyl-4-pyrimidinyl-N, N-dimethylcarbamate), dimethylan [2- (N, N-dimethylcarbamoyl) -3-methylpyrazol-5-yl-N, N-dimethylcarbamate), mexacarbate (4-dimethylamino) -3,5-xylyl-N-methylcarbamate), promecarb [3-methyl-5- (1-methylethyl) phenol-N-methylcarbamate], methiocarb (4-methylthio-3,5-xylyl-N-methyl) Carbamate), formethanate (3-dimethylaminoethylene-iminophenyl-N-methylcarbamate-hydrochloride), thiocarb [dimethyl-N, N '-[thiobis- (methylimino) -carbonyloxy] -bis- (ethaneimidothioate) ] Is given.

A preferred carbamate insecticide has the formula It is Methomir.

Other examples of carbamate insecticides that can be advantageously used in the present invention include carbaryl, thiodicarb, promecarb, carbofuran, bendiocarb.

Further, the present invention can be very advantageously utilized when formulating an organic phosphate insecticide such as monocrotophos.

The liquid carrier preferably contains a large amount of the glycol solvent described above.

The above-mentioned mono- or di-ethylene or propylene
Alkyl ethers of glycols may be lower alkyl monoethers of propylene glycol, dipropylene glycol, ethylene glycol or diethylene glycol, examples of lower alkyl groups in this case being methyl, ethyl, n-propyl, An example is an n-butyl group. The monomethyl ether of propylene glycol is known under the name Methylproxitol,
The monomethyl ether of dipropylene glycol is known under the name methyldiproxitol. Methylproxitol and methyldiproxitol are preferred solvents of this type of solvent, methylproxitol is most preferred, and this is especially preferred when the pesticide is methomyl.

The liquid carrier also contains an alkanol solvent. Preferred alkanol solvents are lower alkanols such as methanol and ethanol. Methanol is preferred when the pesticide is methomyl. However, in general, any suitable alkanol solvent can be selected, taking into account the other components in the carrier. As used herein, the term "lower" preferably means having 6 or less, especially 4 or less carbon atoms.

The carrier also contains a polar-neutral solvent. This is because this solvent has a high dissolving power. That is, this solvent is useful for preventing crystallization (precipitation) of agricultural chemicals at low temperature and during application of the agricultural chemical composition. A preferred polar-neutral solvent is N-methyl-2-pyrrolidinone (NMP), which is especially useful when methomyl is used as a pesticide. Examples of other suitable polar-neutral solvents include dimethylformamide and dimethylacetamide.

The pesticidal composition may also contain one or more ketone solvents. The amount of ketone solvent used is preferably 200 g
/ Below, for example, 5-200 g /. Examples of the ketone solvent include acetone, methyl ethyl ketone, mesityl oxide, cyclohexanone, methyl-n-butyl ketone, methyl isobutyl ketone, diacetone alcohol, methyl amyl ketone, methyl isoamyl ketone, diisobutyl ketone and isophorone. The choice of the ketone solvent will be made in consideration of the solubility of the insecticide, the volatility, the miscibility with other components, the influence on the treated crops, the price and the like. In the case of compositions containing methomyl, cyclohexanone or diacetone alcohol are preferred, diacetone alcohol being particularly preferred. Ketone solvents are believed to help prevent crystallization of pesticides from the carrier mixture.

The composition of the present invention may also contain water. The amount of water used is preferably 250 g / or less, for example 5-250 g /.
Water can be used for promoting the mixing of the components and improving the storage stability of the composition. For application methods other than the ultra-small volume method, most pesticide compositions are diluted with water by the end-user or application.

In some cases it may be preferable to incorporate a dispersing or wetting agent in the composition. The use amount of the dispersant and the wetting agent is preferably 100 g / or less, for example, 5 to 100 g /, which allows the treated crop (for example, the spray-treated crop) to be reliably and appropriately moistened. The dispersants currently commonly used in the field of agrochemical compositions can also be used in the present invention. Examples of the dispersant include sulfonate, ethoxylate, and ethylene oxide condensate, and specific examples thereof include "Chemat-SC15", "Terwick-N30", "Terwick-N40" and "Nonidet-916". ("Kematuto", "Telik" and "Nonidetto" are registered trademarks).

Mixtures of two or more pesticides can also be included in the composition. If methomyl is used, it can also be used in admixture with one or more of, for example, endosulfan, herothion, craclone, azodrine (these are well known pesticides).

The following examples are provided to more specifically illustrate the compositions of the present invention.

Example 1 A methomyl-containing composition was prepared according to the following formulation. It was prepared Ingredient amount (% w / w) methomyl (Pesticide grade) 23 NMP 14 methyl proxitol 32 methanol 14 Water 9 diacetone alcohol 8 100 Example 2 sub connexion methomyl-containing composition the following formulation. Storage stability of; (98% pure pesticide grade) 23 NMP 10 methyl proxitol 45 methanol 12 Water 10 100 Example 3 composition stability Example 1 and Example 2 compositions Ingredient weight (% w / w) methomyl Tested for sex. This storage stability test was performed according to the following method. Seed crystals were put into the composition, and the composition sample was kept at the temperature shown in Table I for a predetermined number of days, and the result was observed. Example 1
And the storage stability of the composition of Example 2 is very good,
They appear to be stable for more than 2 years under normal storage conditions.

Example 4 Miscibility of the composition with other pesticides The compositions of Examples 1 and 2 were mixed with another pesticide, endosulfan, herothion, craclone or azodrine. Miscibility was generally found to be good.
In each case, a stable mixture (ie composition) was obtained by proper selection of the pesticide mix ratio. Thus, the composition of the present invention has good miscibility with other pesticides.

Example 5 Crop spraying test A test of spraying a sunflower cultivated area was conducted. The sunflower was 90% flowering and 10% of the plant had grown to a height with its top bent. The sunflower grew in a healthy state, but the larvae of the moth (Heliothis spp.), Which is a pest, was unevenly distributed on the sunflower.

The methomyl-containing composition of Example 1 was sprayed from an airplane onto sunflower at various spray rates. Spraying is performed using a rotary atomizer, when the spray amount per hectare is 1.5, the droplet size of the spray liquid is about 90 microns, and when the spray amount is 20 per hectare, the spray is The liquid droplet size was about 120 microns. As a sample for comparison, a known methomyl-containing composition was also sprayed. This comparative composition sample is a commercially available "insecticide nudrine".
(Ciel product; "Nudrine" is a registered trademark)
It was.

In this test, the number of moth larvae living on top of 10 randomly selected sunflowers in each of 10 subzones per block of treated sunflower was counted. This sunflower cultivation area was divided into two blocks, and pesticide treatment was performed for each block. The number of larvae was counted just before the treatment and 2 days after the treatment.

The results of this test are shown in Table II.

As is clear from the results of this test, Example 1 according to the present invention
The composition is more insecticidal than the commercially available composition. That is, the composition containing methomyl of Example 1 was sprayed at 1.5 or 20 / ha and the application rate as methomyl was 225 g.am/h.
In the case of a, the above-mentioned known methomyl-containing composition "nudrine insecticide composition" was sprayed at 20 / ha (the application rate as methomyl was the same as that of the composition of Example 1 above). The insecticidal effect is statistically much larger than that. Furthermore, from the results of this test, Example 1
It was also confirmed that the composition of (1) was suitable for both the very small volume application method and the small volume application method.

As a result of inspecting the rotary atomizer used for spraying the methomyl-containing composition according to the present invention, the device is not dirty even after performing each of the treatments described above, is clean, and operates smoothly. It was confirmed to get.

Example 6 A composition containing monocrotophos was prepared according to the following formulation.

Example 7 A monocrotophos-containing composition was prepared according to the following formulation.

Example 8 Crop Spray Test The composition of Example 7 and a commercial monocrotophos-containing composition ["Azodrine 400" (R)] were applied to each of several subregions of pest (Epiphyas postvittana) infested raspberries. Were sprayed respectively. The atomizer used was
It was a Cooper Pegler Kunapsap sprayer with one nozzle.

The results of these treatments were investigated. Both of these two types of monocrotophos treatment were carried out as described in Table III.
ostvittana) had a very good effect.

The results also show that the composition of the invention is more effective than the commercial composition "Azodrine 400".

The compositions of Examples 6 and 7 can be used with equal advantage as the previously described methomyl-containing compositions according to the invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ronald The Ames Mayer Victoria, Australia 3139 Wondane North, Venatsk Road 24

Claims (9)

[Claims] 1. At least one alkyl ether solvent of mono- or di-ethylene or propylene glycol, at least one alkanol solvent, selected from the group consisting of N-methyl-2-pyrrolidinone, dimethylformamide and dimethylacetamide. An agrochemical composition obtained by dissolving at least one carbamate-based or organic phosphate-based agrochemical in a liquid carrier containing at least one polar-neutral solvent. 2. The pesticide 50-500 g /, glycol solvent 10-7
50 g /, alkanol solvent 5-500 g / and the polarity-
The agrochemical composition according to claim 1, which contains 10-750 g / neutral solvent. 3. The pesticide composition according to claim 1 or 2, wherein the pesticide is a carbamate type or organic phosphate type insecticide. 4. The pesticide is selected from the group consisting of methomyl, carbaryl, carbofuran, propoxer, dioxacarb, bendiocarb, aldicarb, oxamyl, pirimicarb, dimethylan, mexacarbate, promecarb, methiocarb, formethanate, thiodicarb and monocrotophos. The agrochemical composition according to claim 3, characterized in that 5. The agricultural chemical composition according to claim 4, wherein the agricultural chemical is methomyl or monocrotophos. 6. The agricultural chemical composition according to any one of claims 1 to 5, wherein the glycol solvent is methylproxitol or methyldiproxitol. 7. The alkanol is methanol or ethanol, and claims 1-6.
The agrochemical composition according to any one of items. 8. A method further comprising at least one component selected from the group consisting of ketones in an amount of 200 g / or less, water in an amount of 250 g / or less, and a dispersant in an amount of 100 g / or less. At least one type of mono- or di-
An alkyl ether solvent of ethylene or propylene glycol, at least one alkanol solvent, N
At least one carbamate or organic phosphate pesticide in a liquid carrier containing at least one polar-neutral solvent selected from the group consisting of methyl-2-pyrrolidinone, dimethylformamide and dimethylacetamide An agrochemical composition obtained by dissolving. 9. At least one mono- or di-ethylene or propylene glycol alkyl ether solvent, at least one alkanol solvent, selected from the group consisting of N-methyl-2-pyrrolidinone, dimethylformamide and dimethylacetamide. Applying an agrochemical composition comprising at least one carbamate-based or organic phosphate-based agrochemical dissolved in a liquid carrier containing at least one polar-neutral solvent to the habitat of pests. A method for controlling pests in their habitat, which comprises: