Tomato bollworm control

Tomato bollworm control

Helicoverpa armigera is a major pest of tomato. It has 7 generations a year and is endangered by the four seasons. The larvae feed on the flowers and fruits of tomato plants, and also eat the tender stems, leaves and buds. After the buds were damaged, the loquat leaves opened and became yellow-green, falling off after 2-3 days. The young fruit was often eaten by the air and caused rot and shedding, and the fruits of fruiting caused by fruiting damage resulted in reduced yield.

Control methods: Cotton bollworm eggs are produced on the buds, combined with pruning, timely snoring and topping can effectively reduce the amount of eggs, and at the same time pay attention to the timely removal of insects, lower insect population base. Chemical control In the hatching period of larvae, use 2.5% high-powered emulsifiable concentrate 40 ml/mu and spray 60 kg water.

In the peak period of adult egg laying 3-4 days per mu with Bt WP 150 g, with water 75 kg sunny afternoon after 4 pm or cloudy spray, spray again every 5 days.

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