Second generation of armyworm

Mythimna separata is omnivorous, overeating, migratory, and concentrated in local areas. It is one of the important pests of grain crops in our county. County plant protection and phytosanitary stations based on the reported lamp population, field eggs, weather forecast and national agricultural technology center forecast, the second generation of armyworm is expected to occur in our county as a whole is light, valley, wheat crops occur moderately. Predictions based on: (1) low moth trapping, on the 2nd of June, the forecasting lamp had seen moths, which was 7-8 days later than in previous calendar years. There were 4 moths of moths for the generation of adult moths, all of which were female moths. , for 3-4 levels. (2) The amount of eggs and insects in the field was low. On June 8-10, eggs and grain in the wheat field were surveyed with an average of 0.01 eggs per square meter. From the 17th to the 19th, there were 0.25 larvae per square meter per square meter, 2 larvae per square meter, no larvae in the corn field, and 80% of the 2nd instar larvae. (3) Meteorological conditions: There are more thunderstorms in recent days. The temperature and humidity are appropriate. It is conducive to the migration of armyworms and the hatching of eggs. It is hoped that township technicians will closely monitor the development of armyworm and organize prevention and treatment in time. Control methods: 1, with 0.3% matrine aqueous solution in the armyworm 2, 3 instar larval stage application, 500-830 ml per acre medication, add water, 50 kg, conventional spray. 2, 4.5% beta-cypermethrin EC 1000-1500 times spray control. 3, 20% speed killing Ding EC 2500-3000 times spray.

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