JP2888388B2 - How to control rice pests - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the invention]

[0001]

The present invention relates to a method for controlling rice pests.

[0002]

2. Description of the Related Art As a method of controlling rice pests using a particulate insecticide, a method of controlling insect pests by applying them to a nursery box and transplanting them to Honda, and a method of controlling insect pests after transplantation have been used. There is known a method of exerting an effect by applying it according to the conditions. It is also known that a fertilizer is applied to the side of a rice seedling to be transplanted during rice planting.

[0003]

In the conventional application of a pesticide to a nursery box, if the chemical is not evenly applied, paddy rice may be harmed after transplanting to Honda, or the insecticide may not be sufficiently effective. May not be demonstrated. Further, even in the method applied to Honda, when the medicine is not evenly applied, the same result as described above may be caused, and much labor is required for application.

[0004] In view of the above, a more efficient control method is desired. An object of the present invention is to provide a method for controlling rice pests that meets such needs.

[0005]

Configuration of the Invention

Means for Solving the Problems The present inventors have made intensive studies on such circumstances. As a result, a granular composition containing an insecticidal active ingredient and having a number of grains per gram of 200 to 2,000 is applied to the side or the side streak of the rice plant at the same time as transplanting the rice seedling to the Honda, and covering the soil. It has been found that a method for controlling rice pests, which is characterized by the above, meets this demand and is efficient.

The insecticidal active ingredient used in the present invention may be any as long as the drug absorbs and transfers into rice seedlings after use and exerts its effect. For example, (1) 1- (6-chloro-3-pyridylmethyl) -N-
Nitroimidazolidin-2-ylideneamine (imidacloprid) (2) 2,3-dihydro-2,2-dimethyl-7-benzo [b] furanyl-N-dibutylaminothio-N-methylcarbamate (carbosulfan) (3) Ethyl-N- [2,3-dihydro-2,2-dimethylbenzofuran-7-yloxycarbonyl (methyl) aminothio] -N-isopropyl-β-alaninate (benflacarb) (4) 1,3-bis (carbamoylthio ) -2- (N,
(N-dimethylamino) propane hydrochloride (cartap) (5) S, S'-2-dimethylaminotrimethylene-di (benzenethiosulfonate (bensultap) (6) 5-dimethylamino-1,2,3-tri Thianoxalate (thiocyclam) (7) 2-Isopropoxyphenyl-N-methylcarbamate (PHC) (8) 0,0-dipropyl-0-4-methylthiophenylphosphate (propaphos) Is not limited to these drugs.

[0007]

【Example】

Examples (Method of controlling pests of paddy rice) The granular composition used in the present invention is obtained by granulating the above-mentioned insecticidal active ingredient by an ordinary method for producing pesticides, and adding 200 parts per gram.
It may be in the range of ~ 2000 grains, the shape is spherical,
Any shape such as a columnar shape is acceptable.

According to the present invention, the above-mentioned granular composition is placed in a soil 2 to 6 cm beside the rice seedling at the same time as the rice seedling transplantation in a rice plant.
m or a 2-5 cm lateral groove of the rice seedling may be applied at a depth of 1-5 cm to cover the soil,
The distance and depth from the rice plant may be appropriately changed depending on the type of drug.

Therefore, the applied medicine does not directly touch the root until the transplanted rice seedlings take root, thereby avoiding phytotoxicity. In addition, the chemicals applied to the soil are gradually absorbed from the roots of the rice seedlings, and thus exert their effects over a long period of time.

It is necessary that the granular composition used in the present invention is 200 to 2000 particles per gram. If it is more than this range, the particles will be finer, and it will be difficult to apply it to the predetermined soil because it will float on the water,
It is not effective enough. On the other hand, if the number of grains is less than the above range, it is difficult to perform uniform treatment, and stable effects cannot be exhibited.

In order to actually carry out the present invention, it is sufficient to attach a groove-producing device to a rice transplanter and apply the granular insecticidal composition in the groove.

In the application method according to the present invention, not only does the drug not directly touch the sprayer, but also the root is not directly touched until the seedlings transplanted with the insecticidal composition take root. And rice seedlings are safe and treated in soil, so there is almost no adverse effect on the environment such as chemical damage to other crops due to splashing.

The application rate of the granular composition according to the present invention depends on the kind of the pesticidal active ingredient used, but is generally about 50 to 500 g per 10 ares as the active ingredient. From both points to obtain stable efficacy and to increase work efficiency, 1-6k per 10 ares
g, preferably about 2 to 3 kg.

The paddy rice pests that can be controlled by the present invention, depending on the type of insecticidal active ingredient used, include the brown planthopper, the green leafhopper, the brown planthopper, the brown planthopper, the rice leaf blowfly, the rice carabae, the rice grasshopper, the rice weevil, the rice weevil and the rice weevil And so on.

The effects of the present invention will be specifically described with reference to test examples.

[0016]

[Test example]

Test Example 1 Insecticidal efficacy test against rice larva beetle larvae Transplanting seedlings (variety: Nipponbare) into paddy fields that had been scraped and dropped using a rice transplanter equipped with a ditcher, and at the same time, the side 3c of the rice seedlings
m, width 1 cm, depth 3 cm, while forming a groove on the side streak, a granular composition containing an insecticidal component prepared by the following method was applied thereto in an amount of 3 kg per 10 ares and covered with soil. As a control, 80 g per box of commercially available bensultap granules (active ingredient: 4%) was applied before transplantation, and a plot was provided for transplantation.
The foliage of the rice plant arbitrarily selected is cut off at intervals of 10 days until 50 days after application, and put into a glass petri dish having a diameter of 6 cm. Five larvae of the rice beetle are released into the petri dish and placed at 25 ° C. or lower. 3 days later, the number of live and dead insects was examined.
The test was performed in 10 repetitions, and the average mortality (%) was determined.
The results are shown in Table 1.

The chemicals tested in this test were prepared by mixing a hammer mill with 1% of white carbon, 2% of polyvinyl alcohol, 50% of bentonite, and 43% of clay in 4% (weight%, hereinafter the same) of bensultap as an insecticidal active ingredient. Then, after adding an appropriate amount of water and kneading, the mixture was granulated by an extrusion granulator and dried. After drying, 2 g / g by sieving
00, 800, and 2000 granular compositions were obtained. In addition, for use as a comparative agent, one having 100 grains and one having 2500 grains per gram were prepared.

[0018]

[Table 1]

Test Example 2 Test on the control effect of the rice leaf beetle in the field In a test place of the rice leaf beetle, the rice seedling (cultivar: Todorokiwase) was transplanted on May 8 with a rice transplanter equipped with a ditcher. Granules (80g per g
0 grains) and covered with soil. The application position was 3 cm laterally and 5 cm deep in the groove of the rice seedlings produced by the groove generator, and the application rate was 3 kg per 10 ares. As a comparative plot, commercially available bensultap granules (active ingredient content: 4%) were dispersed and transplanted in an amount of 80 g per seedling box before transplantation.

The test was carried out at 2 ares per treatment plot, and after 26 days, 34 days and 41 days after transplantation when the damage to the rice leaf beetle larva appeared, 40 strains of larvae and pupae were found at three locations in each treatment plot. , The average number of parasites per 40 strains was determined, and the control rate (%) was calculated in comparison with the untreated plot.

The results are shown in Table 2.

[0022]

[Table 2]

[0023]

When the method for controlling rice pests of the present invention is carried out, the following effects can be obtained. First, according to the method of the present invention, since the drug is present near the root of the rice seedling,
Compared to conventional water application, the amount of drug absorbed from the root increases, and a high control effect is stably exhibited.

Second, since the drug is gradually eluted from the soil and absorbed from the roots of rice seedlings, it has excellent sustainability, and although the application time is earlier than in the case of conventional water surface application,
Even with the application of small doses, a high control effect is maintained.

Third, as compared with the conventional box application method, there is no fluctuation in the control effect due to uneven application of the chemical, and there is no fear of chemical injury.

Fourth, a chemical treatment can be performed at the same time as transplanting the paddy rice, which is a labor-saving control method.

Fifth, unlike the conventional water surface application method, it is not necessary to predict the damage of the rice paddy and spray the water, and it is possible to eliminate the shortage of the control effect due to an erroneous treatment time.

Continuation of the front page (56) References JP-A-4-33305 (JP, U) JP-A-59-13772 (JP, Y2) Patent 2519818 (JP, B2) (58) Fields investigated (Int. Cl. ⁶⁾ A01C 11/00 302 A01M 17/00

Claims (1)

(57) [Claims] 1. A paddy rice insect pest which comprises applying a granular composition containing an insecticidal active ingredient and having a number of particles per gram of 200 to 2,000 to the side streak of a rice plant simultaneously with rice transplantation and covering the soil. How to control.