JPH0256324B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is characterized in that it contains 3-allyloxy-1,2-benziisothiazole-1,1-dioxide and one or more systemic organophosphorus and/or carbamate insecticides as active ingredients. This invention relates to a sterilizing and insecticidal composition for rice cultivation. More specifically, 3-allyloxy-1,2-benziisothiazole-1,1-dioxide (hereinafter referred to as "probenazole") and the systemic organophosphorus insecticide O,O-diethyl-S-2-
(ethylthio)ethylphosphorodithioate (hereinafter referred to as "disulfoton"), O,O-dimethyl-O-[3-methyl-4-(methylthio)phenyl]thiophosphate (hereinafter referred to as "fenthion")
), or O,O-dimethyl-2,2,
2-trichlor-1-hydroxyethylphosphonate (hereinafter referred to as "trichlorfon") and/or a systemic carbamate insecticide 2
-isopropoxyphenyl-N-methylcarbamate (hereinafter referred to as "propoxur"), 2-isopropylphenyl-N-methylcarbamate (hereinafter referred to as "isoprocarb") or 2-secondary-butylphenyl-N-methylcarbamate (hereinafter referred to as "isoprocarb") Regarding rice bactericidal and insecticidal compositions that contain one or more types of BPMC as active ingredients, they exhibit remarkable synergistic control effects, especially against rice blast and leaf blight. At the same time, the present invention provides a novel bactericidal and insecticidal composition that also has a controlling effect on major pests of rice, particularly planthoppers, leafhoppers, green leaf beetles, and rice leafhoppers. In recent years, as rice cultivation methods have become more labor-saving and mechanical transplantation of young seedlings has become widespread throughout the country, major changes have appeared in the appearance of diseases and insect damage to rice. In particular, the period during which rice is exposed to high temperatures during the ripening stage has become longer than ever, and diseases such as blast, sheath blight, and leaf blight have become more common, while damage from pests such as planthoppers, leafhoppers, leaf beetles, and leafminer flies has increased. also shows a growing trend. However, it is extremely difficult to simultaneously and completely control these various diseases and insect pests of rice.Therefore, new sterilizers, insecticides, and their control technologies are needed that can comprehensively control rice pests and diseases in a labor-saving and economical manner. development is desired. "Probenazole", which is one of the active ingredients of the present invention, has already been disclosed in Japanese Patent Publication No. 45-38080 and Japanese Patent Publication No. 49
This is a systemic blast control agent disclosed in the specification of No. 37247, and is a known drug that has extremely low toxicity to humans, livestock, and fish and shellfish, and causes almost no phytotoxicity to adult rice seedlings. The water surface application technology for Probenazole in granule form has been established, and it is currently in widespread practical use as a control agent for rice blast. In addition, for the initial control of pests and diseases in rice seedlings that have been mechanically transplanted, which has recently become widespread, the amount of chemical applied is approximately one-half to one-tenth of the amount applied after transplanting. There is a strong demand for a so-called box treatment technique in which chemicals are applied directly to rice seedling boxes from the viewpoint of labor saving and economic efficiency. In view of these circumstances, the present inventors have conducted intensive studies by testing various drugs with different action characteristics.
As a result, "Probenazole" and "Disulfoton", "Fention", "Trichlorfon", "Propoxur", "Isoprocarb" or "BPMC"
It has been found that a mixture in combination with the above-mentioned bactericidal agent can more reliably and synergistically or synergistically enhance the efficacy as a rice fungicide, especially against rice blast and bacterial leaf blight. In addition, the rice seedling box treatment can control rice blast and early rice leaf blight without causing the above-mentioned chemical damage to rice, and at the same time, by increasing the residual effect, it is possible to control planthoppers, leafhoppers, leafminers, leaf beetles, etc. It can also control pests. The bactericidal and insecticidal compositions of the present invention exhibit remarkable synergistic and synergistic effects that are immediately effective and have a residual effect that cannot be expected from the effects of using each active ingredient alone. The present invention was made based on this new knowledge, and since the bactericidal and insecticidal composition of the present invention can simultaneously control the major pests and diseases of rice as described above with a synergistic effect, the use of active ingredients is The amount may be smaller than the amount usually used for a single component, and therefore there is less concern about toxicity to humans and livestock, phytotoxicity to useful crops, and environmental pollution, so it can be used with confidence, and is labor-saving and economical. Since the rice sterilizing and insecticidal composition of the present invention has such characteristics, it has extremely high practicality. The bactericidal and insecticidal composition of the present invention is prepared by adding the active ingredient and various carriers and various adjuvants that are normally used in the formulation of agricultural chemicals to form a powder (DL-type powder) using a method generally used in the agricultural chemical manufacturing field. ), wettable powders, liquids, floibles, microgranules, granules, tablets, and other desired forms. The carriers used in the present invention include solid carriers such as clay, talc, kaolin, diatomaceous earth, and silica, or benzene, xylene, toluene, kerosene, alcohols (e.g., methanol, ethanol, isopropanol, n-butanol), and ketones. Liquid carriers such as the like (eg, acetone, methyl ethyl ketone, cyclohexanone) are used. These can be formulated with appropriate amounts of surfactants and other auxiliary agents, such as stabilizers and spreading agents, for use. The appropriate blending ratio of "probenazole" used as the active ingredient of the present invention and the penetrating organophosphorus and/or carbamate insecticide is 0.1 to 10 parts by weight of the latter to 1 part by weight of the former. be. In the composition of the present invention, the amount of active ingredients to be mixed can range from 0.1 to 95% by weight, preferably from 0.5 to 90%. In practical use, the respective active compound content in the various formulations and spray preparations mentioned above is generally from 0.01 to 30% by weight, preferably from 0.1 to 15% by weight.
A range of weight percent is suitable. The composition of the present invention can also be applied as a means of absorbing ingredients from the lower part of the rice body to exhibit bactericidal and insecticidal effects. One of the embodiments is a mode in which the composition of the present invention is applied under irrigation conditions, so-called water surface application, which includes soil surface treatment, soil mixing treatment, underwater treatment, water surface treatment, and the like. In this case, the composition of the invention is conveniently in the form of granules, such as microgranules, granules, granules, tablets, and the like. The “particulate matter” mentioned here is
It is not limited by its size, shape, manufacturing method, etc., and includes, for example, rod-shaped, spherical, cylindrical, elliptical, irregular, plate-shaped, and other objects called tablets. In another embodiment, the composition of the present invention is applied to rice seedling cultivation soil for young seedlings during the seedling-raising period. The culturing soil referred to here may be any medium that allows rice seedlings to grow, and all commonly used materials can be used. The composition of the present invention is then applied to the soil by an effective method to distribute it as uniformly as possible in the soil. In this embodiment, there are two methods: a method in which the composition of the present invention is incorporated into the soil in advance, and a method in which the composition is treated before transplanting. In the latter case, as in the case of water surface application, it is convenient for the composition of the invention to be in the form of granules. The amount of the composition of the present invention to be used varies depending on various factors such as the degree of damage, location, tendency of occurrence, weather, environmental conditions, dosage form, component content in the preparation, embodiment, etc. Generally, for water surface application, the granular formulation is applied at a rate of about 0.3 to 10 kg, preferably 3 to 5 kg per 10 ares. Furthermore, when treating rice seedling cultivation soil, it can be used as a granular preparation per 1800 cm ² of seedling cultivation soil surface (this is expressed by a generally popular seedling cultivation box, length x width x height: 60 cm x 30 cm x 3 cm). It is applied at a rate of about 5 to 200 g, preferably 30 to 150 g. Next, some examples of the present invention will be shown, but the present invention is not limited only to the following examples. Example 1 (Granules) "Probenazole" 3 parts by weight "Propoxur" 3 parts by weight Sodium ligninsulfonate 4 parts by weight Lauryl sulfate 2 parts by weight Carboxymethyl cellulose 1 part by weight and clay 87 parts by weight were mixed and pulverized. Add an appropriate amount of water, granulate, dry in a fluidized fluid dryer, and sieve to obtain granules. This granule is uniformly sprinkled once on the day of transplantation at 50 g per box for rice cultivated in box-raised seedlings for mechanical transplantation of young and medium-sized seedlings to prevent rice blast disease and early Honda pests such as rice rot caterpillar and rice leafminer. 100% control was achieved with a synergistic effect. In addition, this granule can be used to improve the leaf growth of rice plants after transplanting to Honda.
In order to control leaf blight, planthoppers, and leafhoppers, use a suitable granulator for 10 days before the first appearance of the disease.
By applying it to the water surface at a rate of 3 kg per area, the pests were 100% controlled with a synergistic effect. Example 2 (Granules) "Probenazole" 1.5 parts by weight "Disulfoton" 5 parts by weight Clay granules 93.5 parts by weight The above clay granules were placed in a rotary mixer, and the above amount of "Probenazole" dissolved in an organic solvent and " After spraying "Daisulfoton" and letting it wet out evenly, dry it at 40-50℃ to make granules. This granule is applied to 100g per box on the day of Honda transplantation for rice grown in boxes for mechanical transplantation of young and medium-sized seedlings.
The grains were evenly dispersed twice and had a synergistic effect to control rice blast, planthoppers, and leafhoppers by 100%. Example 3 (Granules) "Probenazole" 4 parts by weight "Fention" 4 parts by weight "BPMC" 3 parts by weight Polyvinyl alcohol 2 parts by weight and a mixture of talc and clay 87 parts by weight were thoroughly ground, and an appropriate amount of water was added and kneaded. Then, it is made into granules with a particle size of 0.6 to 1 mm using a granulator and dried. This granule is applied to the water surface at a rate of 3 kg per 10 ares using an appropriate granulator 4 to 10 days before the onset of the disease in order to control leaf blast, leaf blight, planthoppers, and leafhoppers in rice plants after transplanting to Honda. By applying this, the pests were 100% controlled with a synergistic effect. The mixed active compounds according to the invention are characterized by a substantially improved efficacy as well as by very low toxicity for warm-blooded animals, so that the compositions are of great utility. The unexpectedly superior and remarkable effects of the mixed active compounds of the present invention can be seen from the following test results when used against rice blast disease. Test example 1 Seedling box application test against rice blast Preparation of test compound: Predetermined amount of active compound and polyvinyl alcohol 2
Parts by weight, and carrier such that the total amount is 100 parts by weight: Thoroughly mix and crush the remaining amount of clay, add an appropriate amount of water and knead, prepare granules with a particle size of 0.6 to 1 mm using a granulator, and dry. and use it for testing. Test method: Paddy rice (variety: Asahi) is grown with a length x width x height of 60 cm.
The rice was cultivated for 20 days in a 30 cm x 3 cm plastic seedling box, and a predetermined amount of granules prepared as described above were uniformly scattered over the entire rice plant at the indicated dosage. The day after the chemical application, take the young seedlings with the soil still attached and measure the diameter.
Three plants were transplanted into 12cm white porcelain pots. After transplantation,
Normal submerged cultivation was continued in a glass room, and after 20 days, rice blast fungus spores were spray inoculated. Seven days after inoculation, the degree of morbidity per pot was graded and evaluated according to the following criteria, and the control value (%) was determined. At the same time, the degree of drug damage was evaluated using the following criteria. Morbidity Spot area ratio (%) 0 0 0.5 2 or less 1 3-5 2 6-10 3 11-20 4 21-40 5 41 or more control value (%) = (Severity of untreated plot - treated plot Morbidity level / Morbidity level in untreated area) x 100 This test is the result of 3 pots in 1 area. Degree of chemical damage -: No expression ±: Occurrence but no practical problem (recoverable leaves, browning of tips) +: Occurrence, practical problem Weak (withering of leaf tips): 〃 Medium: 〃 Strong ++++: 〃 Very strong The results are shown in Table 1.

【table】

[Table] The present invention, which has been explained in detail in the detailed description of the invention, is specifically summarized as follows. (1) 3-allyloxy-1,2-benziisothiazole-1,1-dioxide and systemic organophosphorus insecticide, O,O-diethyl-S-2-(ethylthio)
Ethyl phosphorodithioate, O,O-dimethyl-O-[3-methyl-4-
(Methylthio)phenyl]thiophosphate or O,O-dimethyl-2,2,2-trichloro-1-hydroxyethylphosphonate, and/or systemic carbamate insecticide, 2-isopropoxyphenyl-N-methylcarbamate, A sterilizing and insecticidal composition for rice cultivation, characterized by containing one or more of 2-isopropylphenyl-N-methylcarbamate or 2-secondary-butylphenyl-N-methylcarbamate as an active ingredient. (2) The blending ratio of the mixed active compound is 0.1 to 1 part by weight of the penetrating organophosphorus and/or carbamate insecticide to 1 part by weight of "probenazole".
The sterilizing and insecticidal composition for rice cultivation according to item (1) above, containing 10 parts by weight. (3) A method for controlling rice pests and diseases, which comprises applying an effective amount of the mixed active compound for controlling rice pests and diseases to pathogenic bacteria, pests, and/or their growth sites. (4) The mixed active compounds may be used alone or mixed with diluents (solvents and/or fillers and/or carriers) and/or surfactants, if necessary, e.g. stabilizers, adhesion agents. , 0.01 to 30% by weight of each active compound by mixing with a synergist, preferably 0.1
The pest control method according to item (3) above, which uses a prepared agent containing ~15% by weight. (5) The pest control method according to item (3) above, wherein the applied amount of the mixed active compound is 3 to 5 kg per 10 are. (6) The amount of the mixed active compound applied to the seedling box (length x width x height: 60 cm x 30 cm x 3 cm),
The pest control method according to item (3) above, wherein the amount is 30 to 150 g.

Claims (1)

[Scope of Claims] 1 Contains 3-allyloxy-1,2-benziisothiazole-1,1-dioxide and one or more systemic organophosphorus and/or carbamate insecticides as active ingredients. A sterilizing and insecticidal composition for rice cultivation characterized by: 2. The systemic organophosphorus insecticide is O,O-diethyl-S-2-(ethylthio)ethylphosphorodithioate, O,O-dimethyl-O-[3-methyl-4-(methylthio)phenyl]thiophosphate, or , O,O-dimethyl-2,2,2-trichlor-
1-Hydroxyethylphosphonate, the rice sterilizer according to claim 1, which is
Insecticidal composition. 3. Claim No. 3 in which the systemic carbamate insecticide is 2-isopropoxyphenyl-N-methylcarbamate, 2-isopropylphenyl-N-methylcarbamate, or 2-secondary-butylphenyl-N-methylcarbamate. Sterilization for rice cultivation according to item 1;
Insecticidal composition.