JPH0617281B2 - Granular insecticidal sentinelicide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 1,3-dichloropropene (hereinafter referred to as D
-D) is adsorbed on a granular carrier, and then a water-soluble film-forming substance and a water-absorbing substance are added to the granular nematicidal nematicide.

_{D-D: ClCH = CHCH 2} Cl 1,3- dichloropropene D-D in a liquid having a property of easily very volatilization spread becomes gaseous in the soil, and including various nematodes, wireworms, cutworm, etc. It has a powerful nematicidal effect against soil pests. Since D-D has such a property, the currently commercially available dosage form is an oil agent, and a technique that can be put to practical use in other dosage forms has not yet been developed.

As a method of using this oil solution, after plowing the soil well to level the ground, holes are formed in a staggered pattern at a distance of 30 cm in a depth of 15 to 20 cm, and the oil solution is injected by an irrigation machine. However, this method is extremely complicated in terms of agricultural work and requires a considerable amount of time and labor to control it. Moreover,
The acute oral toxicity _{LD 50} for D-D is 300 mg / kg
(Mouse), which belongs to the category of ordinary substances in terms of toxicity and is relatively safe, it is necessary to be careful not to inhale gas or get it in your eyes or mouth.
In addition, since it has corrosiveness against gold metal, it is very troublesome to handle since it is necessary to wash the equipment after use with petroleum or the like. As a method for solving the inconvenience of applying these oil agents, a method has been proposed in which an inert carrier such as bentonite, diatomaceous earth, or pulp residue is impregnated with D-D to granulate it and pour it into the soil (special feature. (See Japanese Patent Publications No. 38-6499 and No. 41-13880). This method has an advantage that it is not necessary to use a special irrigation machine or a spraying machine, and a conventional granulating sprayer can be applied as it is. However, since DD is very easily volatilized by nature, it is extremely difficult to substantially suppress the volatilization of DD by simply impregnating the inert carrier and granulating it. Therefore, such granulation cannot be said to have fundamentally improved the drawbacks of the oil formulation, and the inherent insecticidal and nematicidal effect of DD cannot be sufficiently exerted.

As a method of improving such conventional granules, a technique has been proposed in which DD is included in a cyclic dextrin to form granules (see JP-A-58-21602). This method is greatly improved in the action and effect in comparison with the conventional DD granules. However, the cyclic dextrin is expensive, and it is necessary to go through the step of including D-D in the cyclic dextrin before the granulation step of the granule, and thus the unit price is very high compared to general granules. It has drawbacks such as sticking.

The inventors of the present invention have conducted in-depth research to solve these drawbacks. As a result, D-D is adsorbed on a granular carrier which is generally used for pesticide granules, and then covered with a water-soluble film-forming substance and a water-absorbing substance to make the granules inexpensive and easy. It was found that the insecticidal and nematicidal effects were sufficient. That is, D-D
After being adsorbed on the granular carrier, the volatilization rate of DD can be suppressed by covering with a water-soluble film forming substance. In addition, general granules require a drying step after granulation by adding water, but with D-D granules, D-D
May be volatilized. In the present invention, since the water-absorbing substance is added after the addition of the water-soluble film forming substance, the drying step is unnecessary.

The method for using the granular nematicidal nematicide according to the present invention is different from the conventional oil irrigation method, and can be easily squeezed into the soil by using agricultural machinery of a general farmer, which saves labor. At the same time, the amount of DD volatilized during the application of granules can be reduced, so that the loss of DD can be reduced. Also, once the granules of the present invention are pour into the soil, the water-soluble film-forming substance gradually dissolves due to the moisture in the soil.
-D is gradually released and exerts a controlling effect for a long period of time. As a result, even if the amount of the active ingredient used is half the amount of the conventional D-D oil agent, the same control effect can be obtained.
You can now effectively use.

The granular carrier used in the present invention can be used regardless of the size of the particle, but it is preferably 0.1 to 20 mm and has a liquid adsorbing ability. For example, diatomaceous earth,
Attapulgite, bentonite, vermiculite,
Sawdust, silicic acid anhydride, porous clay, cellulose powder, etc. can be used.

Examples of the water-soluble film forming substance used in the present invention include the following.

1 Natural polymer starch, dextrin, guar gum, locust bean gum, gum arabic, gelatin, casein, glue,
Zansan gum, pullulan, etc. 2 Semi-synthetic polymer system Methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylstarch, sodium alginate, ammonium alginate, propylene glycol alginate, etc. 3 Synthetic polymer polyvinyl alcohol, Polyvinylpyrrolidone, polyethylene oxide, sodium polyacrylate, polyethylene glycol, etc. These substances may be used alone or in combination of two or more.
The volatilization rate can be controlled by the amount of the water-soluble film-forming substance added, but from the viewpoint of economy, it is desirable to add 0.5 to 5% in the granule.

Further, the granular nematicidal nematicide of the present invention does not need any surfactant such as an emulsifier.

The water-absorbing substance used in the present invention is used to absorb water in which the water-soluble film-forming substance is dissolved or dispersed water. For example, the following substances can be used.

1 mineral salts _{Al 2 (SO 4) 3 ·} 18H 2 O, Na 2 SO 4 · 10
H ₂ O, those anhydrides or part of inorganic salts dehydrating having ability to hold MgSO ₄ · 7H ₂ O and crystalline water,
White carbon, etc. 2 Super absorbent resin AQUAKEEP (trade name of Steel Manufacturing Chemical Co., Ltd.), Sunwet (trade name of Sanyo Chemical Industry Co., Ltd.), Sumika Gel (trade name of Sumitomo Chemical Co., Ltd.), etc. The amount varies depending on the water-absorbing ability of these substances and the amount of water used, but it is preferable to use the amount as a standard so that the fluidity of the particulate matter is not impaired when the manufacturing process is completed.

The D-D used in the present invention can be used as long as it is a high-purity product, and may contain impurities such as 1,2-dichloropropane produced as a by-product during the production of D-D, for example, commercially available products. D-D oil solution [Agricultural Chemicals Handbook, 1981 edition] (Japan Plant Protection Association, published on July 20, 1981), pages 376, 10
See pages 9 to 110] itself. The active ingredient content of the granules of the present invention can be changed depending on the adsorption ability of the granular carrier used, but from the viewpoint of labor-saving control, it is 10 as D-D.
% Or more is desirable.

Next, a representative example of the method for producing the granular nematicidal nematicide of the present invention will be illustrated.

1. After adsorbing DD on the granular carrier, a water-soluble film-forming substance dissolved in an appropriate amount of water is added and mixed well, and then a water-absorbing substance is added and mixed to produce a granule.

2 After adsorbing DD on the granular carrier, a water-soluble film-forming substance is added and mixed well, and then an appropriate amount of water is sprayed. Then, a water-absorbing substance is added and mixed again to produce granules.

3 After adsorbing DD on the granular carrier, an appropriate amount of water is sprayed, and the water-soluble film forming substance is added and mixed. Then, a water-absorbing substance is added and mixed again to produce granules.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the Examples. In the examples and in the control agents described below, all parts are parts by weight.

Example 1 A V-type mixer was charged with 69 parts of attapulgite having a particle size of 0.3 to 0.71 mm, and then 20 parts of D-D was added to the mixture 1
Mix and adsorb for 0 minutes. To this, 10 parts of a 10% aqueous solution of hydroxyethyl cellulose, which is a water-soluble film-forming substance, prepared in advance was added, and after further mixing for 10 minutes, 1 part of Aquakeep (trade name) was added as a water-absorbing substance and mixed for 10 minutes. Granules containing 20% of are obtained.

Example 2 70 parts of attapulgite having a particle size of 0.3 to 0.71 mm was added to the V-type mixed solution, and then 20 parts of D-D was added and 10
Mix and adsorb for minutes. To this was added 5 parts of a 20% aqueous gelatin solution of a water-soluble film-forming substance prepared in advance, and the mixture was further mixed for 10 minutes, and then Na ₂ SO ₄ 5 was added as a water-absorbing substance.
Parts are added and mixed for 10 minutes to obtain granules containing 20% of DD.

Example 3 A V-type mixer was charged with 70 parts of attapulgite having a particle size of 0.3 to 1.19 mm, and then 20 parts of D-D was added and 10
Mix and adsorb for minutes. To this, 5 parts of a 10% aqueous solution of a water-soluble film forming substance, hydroxypropyl methylcellulose, was added, and after further mixing for 10 minutes, 5 parts of MgSO ₄ as a water absorbing material was added and mixed for 10 minutes.
A granule containing 20% D-D is obtained.

Example 4 65 parts of diatomaceous earth having a particle size of 0.3 to 0.71 mm is put into an Eirich rotary mixing granulator, and then 20 parts of D-D is put therein and mixed and adsorbed for 10 minutes. To this was added 3 parts of sodium carboxymethyl cellulose as a water-soluble film-forming substance, mixed well for 10 minutes, and then sprayed uniformly with 7 parts of water,
5 parts of Na ₂ SO ₄ as a water-absorbing substance is added and mixed for 10 minutes to obtain granules containing 20% of DD.

Example 5 72.5 parts of diatomaceous earth having a particle size of 0.3 to 0.71 mm is put into an Eirich rotary mixing granulator, and then 20 parts of D-D is put and mixed and adsorbed for 10 minutes. To this, 2 parts of sodium alginate as a water-soluble film-forming substance was added and mixed well for 10 minutes, then 5 parts of water was uniformly sprayed, and 0.5 parts of Aqua Keep (trade name) was added as a water-absorbing substance and mixed for 10 minutes. , Granules containing 20% of D-D are obtained.

Example 6 67 parts of attapulgite having a particle size of 0.3 to 1.19 mm are put into an Eirich rotary mixing granulator, and then D-D2
Add 0 part and mix and adsorb for 10 minutes. To this, add 5 parts of polyvinylpyrrolidone as a water-soluble film-forming substance and add 1
After mixing well for 0 minutes, spray 5 parts of water uniformly and add 0.5 parts of Aqua Keep (trade name) as a water-absorbing substance.
Mix for minutes to obtain granules containing 20% of DD.

Example 7 Diatomaceous earth 7 having a particle size of 0.3 to 0.91 mm in a V-type mixer
Add 2.5 parts, then add 20 parts D-D and mix and adsorb for 10 minutes. 5 parts of water was evenly sprayed on this, 2 parts of polyethylene oxide was added as a water-soluble film-forming substance and mixed well, then 0.5 parts of Aqua Keep (trade name) was added as a water-absorbing substance and mixed for 10 minutes, 20% of DD
Obtain the contained granules.

Example 8 Diatomaceous earth 7 having a particle size of 0.3 to 0.91 mm in a V-type mixer
Add 2.5 parts, then add 20 parts D-D and mix and adsorb for 10 minutes. 5 parts of water was evenly sprayed onto this, 2 parts of guar gum was added as a water-soluble film-forming substance and mixed well, then 0.5 parts of Aqua Keep (trade name) was added as a water-absorbing substance and mixed for 10 minutes. A granule containing 20% of -D is obtained.

A test control agent having the following composition was produced and tested.

Contrast agent 1 (prescription without addition of water-soluble film-forming substance and water-absorbing substance) 80 parts of attapulgite having a particle size of 0.3 to 0.71 mm was put into a V-type mixer, and then 20 parts of D-D was put thereinto to prepare 1
The mixture is adsorbed for 0 minutes to obtain granules containing 20% of DD.

Control Agent 2 (prescription without addition of water-soluble film-forming substance and water-absorbing substance) 80 parts of diatomaceous earth having a particle size of 0.3 to 0.91 mm was put into an Eirich rotary mixing granulator, and then 20 parts of D-D were put therein. The mixture is adsorbed for 10 minutes to obtain granules containing 20% of DD.

Test Example 1 Volatilization test Put the reagent into a beaker (diameter: 60 mm) with a capacity of 200 ml and leave it in the room (temperature: 12 to 16 ° C.) to economically
The residual amount (%) of -D was measured.

The results are shown in Table 1.

Test Example 2 Test for controlling root-knot nematode of tomato In the test field (1 group 1 m ² , 2 groups), the granules of Examples and control agents were sprayed all over the soil and mixed, and in the case of D-D oil agent, deep from the soil surface. After irrigation at a position of 15 cm, it was covered with a polyethylene film and degassed twice on the 11th and 16th days after the treatment. Thereafter, seeds of tomato (cultivar Toko K) were sown at 5 locations in each ward, 10 seeds per location, and watered three times daily for cultivation. Strains were dug three times 40 days, 50 days and 60 days after sowing, and the root-knot parasitic index was investigated by the Goal index method. The root-knot parasitic index was divided into 5 classes according to the following criteria.

The Goal index thus obtained is expressed as a percentage by the following formula, and this is used as the parasitic index.

Regarding the nematode density, 5 points of soil of 50 g in one section were collected twice before treatment and 60 days after seeding, separated by the Baleman method, and the average number of nematodes per 50 g of soil was investigated. The results are shown in Table 2.

As shown in Table 2, the granular nematicidal nematicidal agent of the present invention showed a perfect control effect even with half the amount of DD required when using the conventional oil agent, and no phytotoxicity was observed at all. . Further, it showed a very excellent control effect even compared with the granules of the control agents 1 and 2 in which DD was simply adsorbed on the granular carrier.

From the above, the granular nematicidal nematicide of the present invention,
It is very practical because it is easy to handle and can effectively use DD.

Claims (1)

[Claims] 1. A granular nematicidal nematicide characterized by comprising adsorbing 1,3-dichloropropene on a granular carrier and then adding a water-soluble film-forming substance and a water-absorbing substance.