1. Bean moth larvae (commonly known as bean worms) damage soybean leaves, resulting in nicks or holes, from light to eat into a mesh, in severe cases, the beans will be eaten into a light bar, can not scab, affecting yield. The damage period usually occurs from late July to late August. The newly hatched larvae are backlit and lurking on the back of the leaves during the day. The 1-2 instars damage the leaves at the top and turn into nodule and generally do not migrate; the food intake in 3 to 4 years of age is greatly increased. Transplant strain damage is the appropriate period for chemical control; age 5 is a gluttony stage, accounting for about 90% of the larvae's food intake. Control methods: Before the third instar larvae, 50% phoxim emulsion 1000 times, 20% cypermethrin 2000 times, 20% cypermethrin EC or 2.5% deltamethrin EC 2000x can be sprayed. .
2. Soybean nematode larvae damage the bean leaves, eat the tender tips, flowers and larvae, can eat the leaves to cause the flowers to fall out, the grain is not full, seriously affecting the yield. Control methods: 20% cypermethrin EC or 2.5% deltamethrin EC can be sprayed with 2000 times solution.
3. Soybean bored worms enter the pods with larvae, bite the beans, and reduce the yield and quality. Control methods: Before the larvae hatch into the soybean meal, use 10% imidacloprid wettable powder 1000-1500 times, 50% kill thiophosphorus 1000 times liquid, 52% farmland 1000 times liquid, 90% crystal enemy 100 Insects were sprayed with 1000-fold liquid, 0.36% Baicao No. 1 EC 800-1000 times or 0.6% exoptim EC 2000- 2500 times.
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