Occurrence regularity of gypsy moth

It has 65,438+0 generations a year, with eggs overwintering in cracks in stones or holes in the back of trunk, and the host begins to hatch when it germinates. The newly hatched larvae live in groups on the back of leaves during the day, feed on leaves at night to form holes, which are rotated after vibration and spread by the wind, so they are also called swing caterpillars. After the age of 2, he scattered food, perched on branches, bark cracks or stones under trees during the day, went up to the trees for food at night, and climbed to hidden places at dawn. The male molts 5 times and the female molts 6 times, all of which are clustered in trees at night. The larval stage is about 60 days, and the damage is the most serious in May-June. In the middle and late June, they gradually matured and climbed to the shelter to cocoon and pupate. During the pupal stage 10 ~ 15 days, adults emerged in large numbers in July. Adults have phototaxis, males are active, and they fly between tree crowns during the day. Female insects rarely fly and can release sex pheromones to lure male moths to mate. After mating, they lay eggs, mostly in branches and dry shadows. Each female can lay eggs 1 ~ 2. The overwintering eggs hatch in May of the following year, and the newly hatched larvae have the habit of gathering and dispersing when they grow up. In early and middle July, mature larvae cocoon and pupate in the hollow parts of trunk, branches and dead leaves. Mid-July is the adult stage. Male moths are good at flying and often fly in groups during the day. Eggs are mostly laid on the shady side of the branches in the tree, and each female lays 1-2 eggs, with hundreds of eggs each, and the tail of the female moth's abdomen is covered with yellow-brown scales.