JPS6097901A - Granular insecticide and nematocide - Google Patents

Abstract

PURPOSE:An inexpensive granular insecticide and nematocide easily being processed into granule, obtained by adsorbing 1,3-dichloropropene on a granular carrier such as diatomaceous earth, or bentonite, coating the adsorbed substance with a film-forming substance and a water absorbing substance. CONSTITUTION:1,3-Dichloropropene of extremely volatine liquid is adsorbed on a granular carrier such as diatomaceous earth, attapulgite, bentonite, vermiculite, sawdust, silicic acid anhydride, porous clay, cellulose powder, etc., which is covered with a film-forming substance such as starch, methyl cellulose, polyvinyl alcohol, etc. and a water absorbing substance such as anhydrous inorganis salt, resin having high water absorption properties, to give a granular insecticide and nematocide. Since the water absorbing substance is added to the adsorbed substance after the film-forming substance is added to it, drying process is not required. The granule can be easily fed to soil by the use of a farm machine of common farmhouse in plowing, and it has lasting rust preventive effect.

Description

Detailed Description of the Invention The present invention relates to the following 1,3-dichloropropene (hereinafter referred to as D
The present invention relates to a granular insecticidal film nematode agent, characterized in that it is made by adsorbing a film-forming substance (referred to as -D) onto a granular carrier, and then adding a film forming substance and a water absorbing substance.

D-D: eBunCH=CHCH2CBunguchi 1.3-DichloropropeneD-D is a liquid that has the property of being extremely volatile, and it spreads in the soil as a gas, causing damage to various nematodes, wire beetles, It exhibits a powerful insecticidal film effect against soil pests such as bed bugs. Because DD has such properties, the currently commercially available dosage form is an oil solution, and technology that can be put to practical use in other dosage forms has not yet been developed.

The method for using this oil is to thoroughly till and level the soil, then make holes 15 to 20 cm deep in a staggered pattern at 30 cm intervals, and inject the oil with an irrigation machine. However, this method is extremely complicated in terms of agricultural work, and requires a considerable amount of time and labor for pest control work. Moreover, D
The acute oral toxicity value LD5° of -D is 300 mg/kg (mouse), which is within the normal range of toxicity and is relatively safe. It is very difficult to handle, as you have to be very careful not to let it get into the water, and since it is corrosive to metals, you have to wash the equipment thoroughly with petroleum etc. after use. As a method to solve these inconveniences of oil application, a method has been proposed in which an inert carrier such as bentonite, diatomaceous earth, or valve residue is impregnated with D-D, granulated, and this material is poured into the soil (particularly Kosho 3
8-6499 and 41-13880).

This method has the advantage that it is not necessary to use a special irrigation machine or spreader, and that a conventional powder spreader can be used as is. However, since D-D is inherently very volatile, it is extremely difficult to substantially suppress the volatilization of D-D by simply impregnating it into an inert carrier and granulating it. Therefore, this type of granulation cannot be said to fundamentally improve the drawbacks of oil agents, and D-D
The insecticidal nematode effect of Kiku's insecticidal film cannot be fully demonstrated.

As a method for 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 significantly improved in terms of effectiveness compared to conventional DD granules. However, cyclic dextrin is expensive, and it is necessary to go through a step to clathrate D-D into cyclic dextrin before the granulation process, making the unit price very high compared to general granules. It has disadvantages such as sticking.

The present inventors have conducted extensive research in order to solve these drawbacks. As a result, it was found that granules can be easily and inexpensively made by adsorbing D-D onto a granular carrier similar to that commonly used in pesticide granules and then covering it with a film-forming substance and a water-absorbing substance. It was found that the insecticidal film was also effective against nematodes. That is, by adsorbing D-D onto a granular carrier and then covering it with a film-forming substance, the volatilization rate of D-D can be suppressed.

In addition, general granules require a drying step after being granulated by adding water, but with DD granules, there is a risk that DD will volatilize when dried. In the present invention, since the water-absorbing substance is added after the film-forming substance is added, a drying step is also not necessary.

The method of using the granular insecticidal membrane nematode agent according to the present invention is different from the conventional irrigation method using oil, and can be easily dug into the soil using the agricultural equipment of ordinary farmers, resulting in a reduction in bone power. At the same time, since the amount of DD volatilized during application of the granule can be reduced, the loss of DD can be reduced.

Furthermore, once the granules of the present invention are poured into the soil, the film-forming substance is gradually dissolved by the moisture in the soil.
is released in a sustained manner and exerts a long-term pest control effect. As a result, it was possible to achieve the same pest control effect even with half the amount of the conventional D-D oil used as the amount of active ingredient, and it became possible to effectively utilize D-D.

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

Film-forming substances used in the present invention include the following.

l Large basket L-based starch, dextrin, guar gum, locust bean gum, gum arabic, gelatin, casein, glue,
Xanthan gum, pullulan, etc. 21 degrees LJL methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl starch, sodium alginate, ammonium alginate, propylene glycol alginate, etc. Koyu J Polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, sodium polyacrylate, polyethylene glycol, etc. These substances may be used alone or in combination of two or more.

It is possible to adjust the volatilization rate by changing the amount of film-forming substance added, but from an economic point of view, it is possible to
It is desirable to add 5% amount.

Further, the granular insecticidal and nematicidal agent of the present invention does not require any surfactant such as an emulsifier.

It is used to absorb water, for example, the following can be used:

1.1 box 1 Au2 (So4) 3 m 18H20, Na2 So
4 Conflict 1 0 H20, Mg SO4・7 H2
Anhydrous or partially dehydrated inorganic salts that have the ability to retain 0% crystalline water, white carbon, etc. The amount of water-absorbing substances mentioned above, such as Sumikagel (trade name, manufactured by Sumitomo Chemical Co., Ltd.), etc., will vary depending on the water-absorbing ability of these substances and the amount of water used, but at the time the manufacturing process is completed. It is best to use the amount that does not impair the fluidity of the granular material.

It goes without saying that D-D used in the present invention can be used as long as it is of high purity.
, containing a 2-dichloropropane impurity,
For example, commercially available D-D oil agents ["Dust Medicine Handbook 1981 Edition" (Japan Plant Protection Association, published July 20, 1981), pages 376 and 109 -
See page 11O] can also be used as such. The active ingredient content of the granules of the present invention can be varied depending on the adsorption capacity of the granular carrier used, but from the viewpoint of labor-saving pest control, it is preferably 10% or more as D-D.

Next, a representative example of the method for producing the granular insecticide and nematode of the present invention will be illustrated.

1. After adsorbing DD on the granular carrier, add a film-forming substance dissolved in an appropriate amount of water and mix well, then add a water-absorbing substance and mix to produce granules.

2. After adsorbing DD onto the granular carrier, add the film-forming substance and mix well, then spray with an appropriate amount of water. The water-absorbing substance is then added and mixed again to produce granules.

3. After adsorbing D-D on the granular carrier, spray an appropriate amount of water, add the film-forming substance, and mix. A water-absorbing substance is then added and mixed again to produce granules.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to the Examples in any way.

It should be noted that all parts in the Examples and in the control drugs described below are parts by weight.

1 pot 1'' Put 69 parts of 7 tapalgite with a particle size of 0.3 to 0.71 mm into a V-type mixer, then add 20 parts of D-0 and mix it with lO.
Mix and absorb for minutes. A 10% aqueous solution of hydroxyethyl cellulose, a film-forming substance, prepared in advance
After adding 1 part of Aqua Keep (trade name) as a water absorbing substance and mixing for 10 minutes,
- Obtain granules containing 20% of D.

1 Shake 1'' Pour 70 parts of 7 tapalgite with a particle size of 0.3 to 0.71 mm into a V-type rational solution, then add 20 parts of D-0 and 10 parts.
Mix and absorb for minutes. To this, 5 parts of a 20% aqueous solution of Zaratin, a film-forming substance prepared in advance, was added and mixed for another 10 minutes, and then 45 parts of Na2SO was added as a water-absorbing substance and mixed for 10 minutes to form granules containing 20% D-D. obtain.

70 parts of tapalgite with a particle size of 0.3 to 1.19 mm was put into a V-type mixer, and then 20 parts of D-0 was added.
Mix and absorb for minutes. To this, the film-forming substance hydroxypropylene methylcellulose prepared in advance 1O%
After adding 5 parts of aqueous solution and mixing for 10 minutes, 3045 parts of Mg as a water-absorbing substance was added and mixed for 10 minutes, D-D
Granules containing 20% of

±65 parts of diatoms with a particle size of 0.3 to 0.71 mm were put into a Gen Lf1 0 Eirich rotary mixing granulator, and then 20 parts of D-D were added and allowed to mix and adsorb for 10 minutes. Add 3 parts of sodium carboxymethyl cellulose as a film-forming substance to this, and
After thoroughly mixing for 1 minute, 7 parts of water was uniformly sprayed, 45 parts of Na2S0 was added as a water-absorbing substance, and the mixture was mixed for 10 minutes.
Granules containing 20% D are obtained.

Support 11" ±72.5 parts of diatoms with a particle size of 0.3 to 0.71 mm were put into an Eirich rotary mixing granulator, and then 20 parts of D-D were added and allowed to mix and adsorb for 10 minutes. After adding 2 parts of sodium alginate as a film-forming substance and mixing well for 10 minutes, 5 parts of water was uniformly sprayed on it, and 0.5 parts of Aqua Keep (trade name) was added as a water-absorbing substance and mixed for 10 minutes. −
Granules containing 20% D are obtained.

67 parts of 7 tapalgite having a particle size of 0.3 to 1.19 mm were put into an Eirich rotary mixing granulator, followed by 20 parts of D-D, and the mixture was mixed and adsorbed for 10 minutes.

After adding 5 parts of polyvinylpyrrolidone as a film-forming substance and mixing well for 10 minutes, 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 DD are obtained.

Diatomaceous earth 72 with a particle size of 0.33 to 0.91 mm is placed in a V-type mixer per factory.
．． 5 parts, then 20 parts of D-D were added and allowed to mix and adsorb for 10 minutes. Spray 5 parts of water uniformly onto this, add 2 parts of polyethylene oxide as a film-forming substance, mix well, and then use Aqua Keep (trade name) 0 as a water-absorbing substance.
．． Add 5 parts and mix for 10 minutes to obtain granules containing 20% DD.

Diatoms with a particle size of 0.3 to 0.91 mm are placed in a V-type mixer ±72
．． 5 parts, then 20 parts of D-0 were added and allowed to mix and adsorb for 10 minutes. Spray 5 parts of water uniformly onto this, add 2 parts of guar gum as a film-forming substance and mix well, then add 0.5 part of Aqua Keep (trade name) as a water-absorbing substance and mix for 10 minutes.I) -D
Granules containing 20% of

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

Put 80 parts of attapulgite with a particle size of 0.3 to 0.71 mm into a V-type mixer, then add 20 parts of D-D and mix 1
Mix and adsorb for 0 minutes to obtain granules containing 20% of DD.

±80 parts of diatoms with a particle size of 0.3 to 0.91 mm were put into an Eirich rotary mixing granulator, and then 20 parts of D-D were added and mixed and adsorbed for 10 minutes to form granules containing 20% D-D. obtain.

3 in a beaker (diameter 60mm) with a capacity of 200m permission Then, the residual amount (%) of DH was measured over time.

The results are shown in Table 1.

4-2 Tomato Nekobusen Yu, ■ In the test field (1 tn' per plot, 2 plots), the granules of the example and control agents were spread over the entire surface of the soil and mixed, and in the case of the D-D oil, it was mixed in from the soil surface. After irrigating at a depth of 15 cm, the water was covered with a polyethylene film and the water was irrigated on the 11th and 16th day after treatment.
Gas was degassed twice on the day. Thereafter, tomato seeds (variety Toko K) were sown in 5 locations in each district, 10 seeds per location, and cultivated by planting three times a day. The plants were dug up three times, 40 days, 50 days, and 60 days after sowing, and the root gall parasitism index was investigated using the Gall index method. The root-knot parasitism index was divided into five classes according to the following criteria.

6 5 The goal index thus obtained was expressed as a percentage using the following formula, and this was used as the parasitic index.

Nematode density was determined by collecting 50 g of soil from 5 points in each section twice, before treatment and 60 days after sowing, and separating them using the Behrman method, and investigating the average number of nematodes per 50 g of soil. The results are shown in Table 2.

7 As shown in Table 2, the granular insecticidal membrane nematode agent of the present invention showed perfect control effects even at half the amount of -D required when using conventional oil agents, and no chemical damage was observed at all. . In addition, it showed an extremely superior pesticidal effect compared to control agents 1 and 2, which were granules in which DD was simply adsorbed onto a granular carrier.

From the above, the granular insecticidal membrane nematode agent of the present invention is
It is easy to handle and allows effective use of D-D, making it very practical.

Patent applicant: Hokuko Chemical Industry Co., Ltd. 0

Claims (1)

[Claims] 1. A granular insecticidal membrane nematode agent characterized by adsorbing 3-dichloropropene on a granular carrier and then adding a film-forming substance and a water-absorbing substance.