Soybeans are prone to produce a pest, that is, soybean-building worms, soybean worms are harmed by larvae, which seriously affects their yield. So, how should soybean bridge-building worms be controlled?
Soybean bridge-building insects are all larvae. Younger larvae only feed on mesophyll, leaving a transparent epidermis. As the age of the insects increases, the food intake also increases. The edges of the leaves are bitten into nicks and holes, and even all of them are eaten, leaving only a few veins, reducing the area of ​​green leaves, affecting photosynthesis, resulting in falling flowers and pods.
Control of soybean bridge insects.
The chemical control must be carried out before the larvae enter the gluttony period, that is, the larvae are suitable for the second to third ages. Use 4.5% beta-cypermethrin EC 2000 times or 20% pyrethroid EC or 2.5% deltamethrin EC 2500 times, 50 kg of application solution, spray evenly. Each mu can also be sprayed with 2.5% trichlorfon powder or 80% dichlorvos or 90% crystal trichlorfon 1000 times, or 40% dimethoate 800 times, 50 kg of application liquid, evenly sprayed.
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