It is extremely difficult for the wheatworm armyworm to have a very high reproductive capacity and it is very difficult to eliminate it completely. This has caused headaches for the majority of farmers. Want to eliminate the wheat armyworm, we must first master its habits, and then take a scientific method of prevention and treatment can be effective.
The adults of the wheat beetleworm have the habit of migrating from long distances. The spring will gradually migrate from south to north, and fall from the north to the south. In our province, 3 to 4 generations occurred in a year. Adults grow nocturnally and feed at night. Adults have a strong tendency to light, sweet and sour liquid.
Females tend to lay eggs in the dry leaves, in the corn seedling eggs produced in the tip of the leaves, adult plants in the temporal lobe or ear spikes, etc., the formation of vertical strips of egg mass, each egg block 20 to 40, many Up to 200 to 300 tablets. Each female produces 1000 to 2000 eggs. Wheat weevil prefers moist climate, relative humidity more than 75%, temperature of 23 °C ~ 30 °C is conducive to adult oviposition and larval survival.
The larvae have six instars, and the larvae of the first to second instar are mostly hidden in the heart of the crops, and feed on the leaves, leaving only the epidermis. After 3rd age, the leaves bite into irregular and incomplete leaves, and when the density is high, the leaves can be eaten leaving only the veins. After 4th instar, the larvae are suspended dead and enter the binge-eating stage. When the big larvae occur, they have the habit of colonization. After larvae matured, they stopped feeding and climbed into soil layers of 3 to 4 cm in order to remove soil maggots.
For these living habits of wheat aphid, these control methods should be adopted:
Method one: 100 larvae need to be controlled when 10 heads or 5 heads per square meter, use 90% crystals of trichlorfon 1000-1500 times, and 50% malathion-containing EC 1000-1500 times.
Method two: 90% crystal trichlorfon plus 40% dimethoate EC mixture 1200 to 1500 times liquid spray, or 4.5% beta cypermethrin 2000 to 3000 times liquid evenly spray, or 25% diflubenzuron third 500 to 600 Evenly spray, or 25% of the enemy horse 50 ~ 80 ml, watered 15 ~ 30 kg uniform spray.
Method 3: Before the third instar, use 25% diflubenzuron III suspension 500 to 600 times, 40% phoxim EC 1000 times or 40% chlorpyrifos EC, 4.5% beta cypermethrin 1500 to 2000 times or 2.5% Lambda-cyhalothrin 2500 times spray control.
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