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1. Occurrence of pests: nymphs or adults attach to twigs, leaves, and fruits to suck sap, causing stems to dry and defoliate. Leaf growth is affected. Tree vigor is weak, even dead trees are dead. The fruit is deformed after being victimized. Loss of commodity value.
2. There are two reasons for the recurrence of recurrences: First, the scale insect nymph body is small and often adheres to the shoots. Generally, it does not attract people’s attention. Once the insect body expands, it forms a shell and a waxy layer. Pharmacy is difficult to control, delaying the appropriate period of control; Second, there is no choice of medication, should be selected with stomach poison, contact killing, strong penetration of the drug.
3, prevention measures
1). Artificial control Before adult females laid eggs in early May, artificial eradication of adults could achieve a multiplier effect, because 1 female adult can lay over 1,000 eggs.
2), chemical prevention and control to seize two key prevention and control period: First, 10-15 days before germination, in mid-March, when there is a large number of activities of winter nymphs, no leaves during this period, the liquid can directly contact with the body, reaching the contact effect; When a large number of nymphs from the 1st generation crawled out of the shell and scattered to the branches, leaves, and fruits, they were 10-15 days before the harvest. No scale shell and waxy layer were formed in scale insects during these two periods, and the insect body was extremely sensitive to pesticides. During this period, chemical control was performed with the best results. Can use 40% speed culling 1000-1500 times or 35% Saitan 1500-2000 times spray.
Occurrence and control of scale insects in fruit trees
This year, the fruit tree scale insects were poor in individual management levels, and the incomplete orchards in the early spring were heavier. The scale insects that occur mainly include ball locusts, turtle wax larvae, pear garden locusts, Cornell mealybugs, etc., and mainly harm apples, pears, peaches, apricots, and persimmon trees.