Soybean aphids, also known as worms and honey worms, are the main pests that damage soybeans. The damaged soybean leaves are curled and yellowed, the growth is short, the branches are small, and the pod-forming rate is low. When the damage is serious, the yield is reduced by more than 50%.
Occurrence rule: Soybean aphids occur more than 10 generations in 1 year, and the eggs are overwintered on the bud side or gap of the main branches. From mid-May to early June, winged mites are produced, and the soybean fields are moved to damage the seedlings, forming spots. From late June to early July, it spread rapidly and reached a critical period. From the end of August to the beginning of September, winged female baboons are produced, which are mated with the reincarnated winged owls and lay eggs for wintering. In spring, there is plenty of rain, good nutrient conditions, and good breeding. Before the peak period, the temperature is between 22 °C and 25 °C, and the relative humidity is above 78%.
Symptoms: Soybean aphids use the adult and larvae to suck the juice on the young leaves and tender stems, and can also harm the tender pods. Because it secretes a kind of "honey", it often attracts ants to crawl and crawl on soybean plants. After the soybean is damaged, the growth is stagnant, the 100-grain weight is reduced, and the plant can die when the seedling stage is severe.
Chemical control: Soybean aphids are seriously harmful in the early stage, and the key to prevention and control is timely detection and prevention in the seedling stage. 40% dimethoate emulsifiable concentrate, 50% sputum emulsifiable concentrate, 50% sputum mist wettable powder, 2.5% deltamethrin (enemy kill), 2.5% cyhalothrin (Kung Fu), smashing When the agent is sprayed on water, the control effect is good.
Occurrence rule: Soybean aphids occur more than 10 generations in 1 year, and the eggs are overwintered on the bud side or gap of the main branches. From mid-May to early June, winged mites are produced, and the soybean fields are moved to damage the seedlings, forming spots. From late June to early July, it spread rapidly and reached a critical period. From the end of August to the beginning of September, winged female baboons are produced, which are mated with the reincarnated winged owls and lay eggs for wintering. In spring, there is plenty of rain, good nutrient conditions, and good breeding. Before the peak period, the temperature is between 22 °C and 25 °C, and the relative humidity is above 78%.
Symptoms: Soybean aphids use the adult and larvae to suck the juice on the young leaves and tender stems, and can also harm the tender pods. Because it secretes a kind of "honey", it often attracts ants to crawl and crawl on soybean plants. After the soybean is damaged, the growth is stagnant, the 100-grain weight is reduced, and the plant can die when the seedling stage is severe.
Chemical control: Soybean aphids are seriously harmful in the early stage, and the key to prevention and control is timely detection and prevention in the seedling stage. 40% dimethoate emulsifiable concentrate, 50% sputum emulsifiable concentrate, 50% sputum mist wettable powder, 2.5% deltamethrin (enemy kill), 2.5% cyhalothrin (Kung Fu), smashing When the agent is sprayed on water, the control effect is good.
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