JP4599943B2 - Whitefly control agent - Google Patents

Description

  The present invention relates to whitefly control agents and the like.

  Conventionally, various insecticides have been used for the purpose of controlling whiteflies and the like.

SHIBUYA INDEX (Index of Pesticides) 9th Edition (2002) SHIBUYA INDEX RESEARCH GROUP

  However, whiteflies tend to develop resistance to insecticides, thus reducing the control effect of these insecticides. Therefore, it is preferable that various types of insecticides are prepared so that the rotation of the insecticides is possible in every scene and situation. Among the insecticides prepared, it is possible to delay the development of insecticide resistance in whiteflies as much as possible, and the development of whiteflies control agents having an excellent control effect has been demanded.

Under such circumstances, the present inventors have examined various whitefly control agents, and as a result, starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2 , 4-triazin-3 (2H) -one was found to exhibit an excellent control effect with a synergistic effect on whiteflies, and the present invention was completed.
That is, the present invention
1. As an active ingredient, starch (hereinafter sometimes referred to as substance A) and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazine -3 (2H) -one (hereinafter also referred to as “substance B”), a whitefly control agent (hereinafter also referred to as “the present control agent”);
2. The mixing weight ratio of starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazin-3 (2H) -one is 5: The whitefly control agent according to the preceding item 1, which is contained in a ratio of 1 to 50: 1;
3. Starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1, an active ingredient of a rotation agent for delaying the development of insecticide resistance in whiteflies Use of 2,4-triazin-3 (2H) -one;
4). Starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4- as active ingredients of application agents in Integrated Pest Management Use of triazin-3 (2H) -one;
Etc. are provided.

  By this invention, it became possible to provide the control agent which has the control effect outstanding with respect to whitefly.

  “Starch” (ie, substance A) contained as an active ingredient of the control agent of the present invention is not only natural starch obtained from potato, sweet potato, cassava, wheat, corn, rice, etc., but also hydrolyzed and oxidized A wide range of processed starches that have been treated, such as acetylated, methylated, etc. alkylated, hydroxypropylated, etc., hydroxyalkylated, allylated, carboxymethylated, etc. It means starches. Specific examples of the modified starch and starch derivative include dextrin, pregelatinized starch, amylose, amylopectin, oxidized starch, krafted starch, and pregelatinized hydroxypropyl starch. Examples of commercially available pesticides include “Adhesion-kun (trade name)” (Sumitomo Chemical Co., Ltd.) described in SHIBUYA INDEX (Index of Pesticides) 9th Edition (2002) SHIBUYA INDEX RESEARCH GROUP 85-14. Industrial).

  “(E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazin-3 (2H) -one contained as an active ingredient of the control agent of the present invention (Ie, substance B) is a compound known by the general name pymetrozine, and is described, for example, in SHIBUYA INDEX (Index of Pesticides) 9th Edition (2002) SHIBUYA INDEX RESEARCH GROUP 64-5. It is an active ingredient of “chess (trade name)” (syngenta).

  The control agent of the present invention contains a substance A which is considered to have no insecticide-resistant development in whiteflies due to its insecticidal activity, and 2 of such substance A and substance B which is another active ingredient. Since it has different insecticidal activity of different types, it is possible to sufficiently delay the development of insecticide resistance in whiteflies, and if such a control agent is used as a rotation agent for controlling whiteflies, It becomes possible to delay the development of insecticide resistance not only in the control agent but also in other whitefly control agents.

  In addition, since the control agent of the present invention has characteristics such as hardly causing harm to natural enemy organisms or having no effect, a plurality of pest control methods are rationally combined, and from an economical viewpoint, It can be used as an applied agent in Integrated Pest Management, which has recently been attracting attention as a technology for determining the necessity of control while observing changes in density and crop damage, etc. As ingredients, starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazin-3 (2H) -one may be used.

  Examples of whiteflies that are targets for control in the present control agent include silver leaf whitefly, on-site whitefly, tobacco whitefly, and the like. Examples of the agricultural and horticultural plants to which the control agent of the present invention is applied include sugar beet such as tomato, eggplant and bell pepper, flower buds and flower trees such as poinsettia, rose and gerbera, and fruit trees such as citrus.

Substance A and substance B contained as active ingredients of the control agent of the present invention may be used as they are without adding any other components, but usually mixed with various carriers such as a solid carrier and a liquid carrier, If necessary, surfactants and other formulation adjuvants are added as additives, and flowable agents such as wettable powder, granular wettable powder, emulsion, aqueous solvent, liquid, suspension in water, emulsion in water, Use as a preparation such as powder, or mix each active ingredient after formulating it into various dosage forms as described above, or mix it after further diluting with water to prepare each drug solution. You can also. In these preparations, the mixing weight ratio of substance A and substance B as active ingredients is usually contained in a ratio of 5: 1 to 50: 1, and the total amount of active ingredients in the preparation is usually in a weight ratio. 0.1% to 95%.
Examples of the solid carrier used in the preparation as described above include clay, talc, bentonite, acid clay, diatomaceous earth, calcium carbonate, zeolite, starch, dextrin, white carbon, ammonium sulfate, sodium sulfate and potassium chloride. Examples of liquid carriers include monoalcohols having 1 to 8 carbon atoms such as water, ethanol, isopropanol and butanol, diols having 2 to 8 carbon atoms such as ethylene glycol, propylene glycol, diethylene glycol and hexylene glycol. Can be mentioned. Examples of the surfactant include known anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. Examples of other formulation adjuvants include emulsifiers, stabilizers, dispersants, wetting agents, suspending agents, spreading agents, penetrating agents, antifungal agents, and the like. For example, casein, gelatin, polysaccharides, lignin derivatives, bentonite, saccharides, synthetic water-soluble polymers, PAP (isopropyl acid phosphate), BHT (2,6-di-tert-butyl-4-methylphenol), BHA ( 2- / 3-tert-butyl-4-methoxyphenol), vegetable oils, mineral oils, surfactants, fatty acids or esters thereof.

The preparation thus obtained is usually applied in the form of a diluted solution obtained by diluting a preparation such as the above-mentioned aqueous solvent, wettable powder, granular wettable powder, emulsion, and liquid with water or the like.
The application concentration of the control agent of the present invention is an amount effective for controlling whitefly as the concentration of the substance A, and is usually 100 ppm to 1000 ppm, preferably 200 ppm to 800 ppm. Further, the concentration of the substance B is usually 30 ppm to 200 ppm, preferably 50 ppm to 100 ppm.
The application amount of the control agent of the present invention is usually 10 g to 700 g, preferably 20 g to 560 g in terms of the amount of substance A per 10 ares of application site, and usually 3 g in terms of the amount of substance B. ~ 140g, preferably 5g ~ 30g.
These application concentrations and application rates vary depending on the type of preparation, application time, application location, application method, type of whiteflies, damage level, etc., and can be increased regardless of the above range, It can be reduced.

  EXAMPLES Next, although an Example and a test example demonstrate this invention further more concretely, this invention is not limited to these. In the following description, “parts” represents parts by weight.

Formulation Example 1
5 parts of Toxeal GUN (white carbon manufactured by Tokuyama Soda), 40 parts of matsunoline 500 (starch made by Matsutani Chemical Industry) as substance A, 8 parts of pymetrozine as substance B, 5 solpol 5060 (sodium alkylbenzenesulfonate, surfactant manufactured by Toho Chemical) 5 The present control agent (wetting agent) was obtained by pulverizing and mixing 42 parts of Katsumiyama clay and 42 parts of Katsumiyama clay (Clay made by Katsuyama mining company).

Test example 1
Substance A (Sumitomo Chemical Co., Ltd., Adhesive-kun 5% solution) formulated as a liquid and Substance B (Syngenta Japan, Chess 25% wettable powder) formulated as a wettable powder are each diluted with water. The reagent was obtained by mixing the liquid so as to have a predetermined active ingredient concentration.
On the other hand, Tetorongose was put on a frame of 15 cm in length × 15 cm in width × 30 cm in height, pot-planted tomatoes were placed in the frame, and 30 adult white lice were released. After leaving still for 24 hours, a sufficient amount of the above-mentioned reagent supply was sprayed on tomatoes with a hand sprayer, and the death rate was investigated 24 hours after spraying. The test was performed in triplicate.
In addition, each diluted solution before mixing was similarly tested as a control agent for calculating a theoretical insecticidal rate described later.
The results are shown in Table 1. The theoretical value insecticidal rate (%) was calculated by the following formula.

Theoretical insecticidal rate (%) = a + {(100−a) × b} / 100
Here, a represents the insecticidal rate (%) of the substance A, and b represents the insecticidal rate (%) of the substance B.

By this invention, it became possible to provide the control agent which has the control effect outstanding with respect to whitefly.

Claims (4)

Containing starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazin-3 (2H) -one as active ingredients The whitefly control agent characterized by this. The mixing weight ratio of starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazin-3 (2H) -one is 5: The whitefly control agent according to claim 1, which is contained in a ratio of 1 to 50: 1. Starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1, as an active ingredient of a rotation agent for delaying the development of insecticide resistance in whiteflies Use of 2,4-triazin-3 (2H) -one. Starch and (E) -4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4- as active ingredients of application agents in Integrated Pest Management Use of triazin-3 (2H) -one.