Occurrence and Control of Bean Moth
Harmful Symptoms The moth larvae feed on the leaves of the larvae. The young larvae eat wormholes and nicks. After the third instar, the larvae can eat up all the leaves and leaves the plants unable to scab, which greatly affects the yield. Occurrence Regularity From mid-late July to early August, adult oviposition prosperous period. From late July to late August, the larvae are endangered. In early September, light yellow mature larvae enter into the soil for winter. Adult habits: Adults grow nocturnally and have a strong tendency towards black light. In the evening, activities begin to take place, and they are strong and highly mobile. Night copulation, spawning 3 days after copulation, eggs scattered on the back of the bean leaf, generally 1 leaf on the production of 1 to 2 eggs, eggs can be hatched 7 days into larvae. Larvae: The larvae are backlit and most of them are on the back of the leaves or stems during the day. They feed strongly at night and can feed on a cloudy day. 1 to 2 instar larvae eat a small amount, generally do not transfer strain hazards, 4 after the age of transfer hazards habits, 5th instar larvae food intake increased, its food intake accounts for about 90% of the total food. Larval period 30 to 35 days. The occurrence of conditional drought is not conducive to the occurrence of pod moth. The plantation with dense growth, low topography, and fertile soil was heavier; soybeans were heavier for early maturing varieties. During periods of phlegm and feathering, if rain is moderate, it will be heavy. Excessive rainfall is delayed. Prevention and control method to trap and kill adults: the use of strong phototaxis of adults, set black light trap adult insects, can reduce the amount of eggs in the field, reduce harm. Chemical control: The appropriate period for controlling larvae of pod moth should be controlled before the third instar, and use 1500-2000 times of 4.5% beta-cypermethrin per acre, or 1500 times of 50% phoxim EC, and 50 kg per acre of spray liquid. Since the larvae have a habit of nocturnal emission, the spraying time should be after 5pm.
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