What are the characteristics of the damage of aleurone mealybug to pomegranate? How to prevent it?

Durian mealybug, also known as Lagerstroemia indica and Pomegranate mealybug. Adults and nymphs suck sap from shoots, twigs, fruits and leaves, which weakens the vitality of trees. Its secretion is easy to induce sooty blotch, which makes the branches and leaves turn black and leaves fall off and die.

Generally, 1 year has three generations, and the third generation nymph overwinters on branches, subcutaneous parts and branches in early October of 1 1 year1October. In early April of the following year, overwintering nymphs were divided into male and female, and in early May, female adults began to lay eggs, with single female laying 100 ~ 150 eggs. Eggs are laid in pseudoshells, and the egg period is 10 ~ 20 days. After hatching, they climb out of their shells. The first generation of nymphs occurred in the first half of June; The second and third generation nymphs occurred in mid-July and late August respectively, with overlapping generations.

Key points of prevention and control:

① Agricultural control. In winter and spring, carefully scrape off the bark with a hard brush, brush off the overwintering nymphs in the cracks of the bark, and burn or bury them centrally.

② Biological control. In conditional areas, natural enemies such as ladybugs, beetles and wasps can be artificially raised and released for control.

③ Chemical control. Spraying 0.9% avermectin EC 6000 times or 25% buprofezin WP 2000 times, 5% cis-fenvalerate EC 1500 times and 20% phoxim EC 3000 times on the leaves at the peak of nymph occurrence in each generation.