According to a recent investigation of the summer corn field in Linyi District, the second generation of armyworms occurs moderately, with an average of 100 insects and 25 insects. Due to recent rainfall and other factors, it is extremely beneficial to the second generation of armyworm hatching, with an area of ​​about 300,000 mu. It is now the second generation of armyworm gluttony, and it is also the most critical period for prevention and control.
Prevention technology
1. Agricultural control of hard-seeded plots shall be carried out as soon as possible after the emergence of maize, and chemical weeding in the field shall be performed in time to destroy the habitat of the corn armyworm and reduce the source of insects.
2. Artificial killing At present, most of the armyworms are in the 3-4 instar period, and the worms are larger. In the morning and in the evening, they can artificially pinch and kill the feeding larvae and the white cotton wool-like egg blocks on the back of the leaves.
3, chemical control:
(1) Poison bait trapping: Acres with 100% trichlorfon 100 grams against the appropriate amount of water, mixed in 1.5 kilograms of bran fried bran made bait, in the early evening along the corn line to spread, seduce.
(2) Foliar spraying: The mu of the larva before the third instar is sprayed with 2.5% cyhalothrin EC or 4.5% beta-cypermethrin 20-30 ml or diflubenzuron No. 3 50 ml diluted with water 30 kg; At the age of 3-4, mu is sprayed uniformly with 48% chlorpyrifos (15-20 ml) or 0.5% methoquinone salt (30-40 ml) with 30 kg water.
(3) Spreading poisonous soil: Mu with 40% phoxim EC 75-100 g amount of water, mixed with 40-50 kg of sand in the heart of corn leaves, you can protect natural enemies, but also prevent corn borer.
Precautions
When spraying, sufficient water should be used, and the amount of water per mu should not be less than 30 kg, evenly sprayed so as not to re-spray or leak. Spray the drug as far as possible on the corn leaf.
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