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The genus Eupatorium is a member of the Lepidoptera family of Lepidoptera, and the larvae endanger the plants of Liquidambar, Acacia and Ligustrum. One-year-old, mature larvae grow in winter in the rhizomes of the plants, and they begin to phlegm in late April. Adults emerge in mid-May. They lay their eggs and hatch eggs. In late May, eggs hatch. From June to August, they are the peaks of their cockroaches. . The body of the larvae of the mosaic clumps is tan, the head and the pronotum are black, the dorsal midline is red-brown, and each side of the body has yellow-white spots. The young larvae veiled at the front of the leaves. Everyone clustered in the net to leaf the epidermis of the leaves, leaving unpleasant veins and the lower epidermis; the older larvae adhered to the shoots and leaves to make nests, and the leaves were bitten out and nicked. Petiole and shoots are also snapped; larvae disperse when they are old and mature, conjugated with 1 to 2 leaves form a capsule, a cyst, an insect, hungry will drill out to find food; larvae lively, Skilled and frightened, he would parachutize or return to the nest. Until the leaves of the plants were eaten, they migrated in groups to other plants and continued to eat and drink. From late August to early September, the mature larvae climbed down the trees and tan brown silkworms were overwintering in weeds, under litter, or in loose soil.
There are some prevention and control measures. In autumn and winter, the roots of the damaged plants are turned over to the topsoil to mechanically kill the overwintered insects. In the adult emergence period, light is used to trap and kill the insects, and insect nests are removed in time. These methods can effectively reduce the number of insects. 25% diflubenzuron 3 1000 times spray can be used in young larvae, and the control effect can reach 95%.
Occurrence and Control of Mosaic Cone
In recent years, the main leaf pests on the Liquidambar formosana have been used as leaf pests. The rate of insect strains exceeds 30%, and the number of strains per plant is 20 to 50. They prefer the leaves and young shoots of sweet gum and the larvae are pulled up. The white-bright silks, with their leaf-shaped knots, form a dense net screen that hinders the growth of new shoots. When they were infested, gluttony and food were eaten up, and poor sweetpotato wilted and their lives could not be guaranteed.