Occurrence regularity and control measures of Luan Shu jujube tortoise wax medium

Jujube tortoise wax (CeroplastesjaponicusGr) belongs to Homoptera, Calyx family, also known as Japanese wax, jujube carapace wax, commonly known as jujube lice. When it occurs in a large area on Koelreuteria paniculata, the branches and leaves of the whole tree are covered with worms, and the attachment of female insects to the branches looks like snow from a distance. The nymphs suck sap on the leaves, and the excrement is covered with the whole tree, resulting in the weakening of the tree and seriously affecting the green landscape. Through two years of investigation and research, the occurrence regularity of the pest was found out, and a satisfactory control method was found.

The first generation of the insect overwintered as fertilized female adults on annual or biennial branchlets, and the eggs were laid under the female worms. Each female could lay 1500 million eggs. The overwintering female adults began to feed in March and April, and the larvae increased rapidly in mid and late April. They began to lay eggs in mid and late May, and the egg period was as long as 2530 days. Nymphs began to occur in late June, and most of the newly hatched nymphs lay quietly under the female shell. After a few days to disperse out, climb to the leaf veins on both sides of the harm, a few days later secrete wax, the formation of a shell, fixed. After maturing, the female migrates back to the branch from the leaf and mate with the male, and then fix it on the branch to survive the winter. The male nymph began to pupate in the early and middle of August, and the pupal period was about 15 days. After Eclosion into adults, females and males in late August and early September, the males died and overwintered as females.

During the egg incubation period, when there are many Rain Water, the air humidity is high, the temperature is normal, the hatching rate of eggs and the survival rate of larvae are very high, up to 100%, which is harmful in that year. On the contrary, during this period, lack of rain, high temperature, dry, a large number of eggs and newly hatched nymphs will dry and die under the mother shell, and the harm is mild in that year; during the overwintering period of female adults, when there is more rain and snow and ice on the branches, the natural mortality rate is high.

Prevention and cure measures

1. Artificial control: from November to March of the following year, the overwintering female adults can be scraped, pruned and pruned.

2. Beat the ice edge to eliminate the overwintering female adult. In severe winter, if there is rain and snow, when there is thicker ice on the branches, knock on the branches in time to shake off the ice, which can shake off the overwintering insects with the ice.

3. During the nymph outbreak, 40% omethoate + 40% isocarbophos was sprayed 1500 times, and 2 Mel was sprayed 3 times, with an interval of 7 Mel for 10 days.

4. Carbofuran root irrigation: the root was irrigated twice in May with 25% wettable powder 200mur300 times, which had a good effect on killing nymphs.