What are the damage characteristics and living habits of jujube gall midge
Jujube gall mosquitoes are commonly known as curly leaf maggots, jujube maggots, which harm the young leaves of jujube trees with larvae, making the injured leaves curl vertically to the leaves. The curly leaves were purplish red in the early stage and brownish green in the later stage. The injured leaves gradually withered and scorched and fell off.
Jujube gall midge produces 5-6 generations every year and overwinters as larvae in the shallow soil under the tree. The larvae began to roll leaves in late April, and the damage reached its peak in early May. The first generation of pupae was in early June and emerged as adults in early June. A large number of larvae occurred in Beijing from May to June, and the damage was the most serious. The larvae matured in about 10 days. In late August, the mature larvae began to enter the soil as cocoons to survive the winter.
What are the main measures to control jujube gall midge
According to the living habits of this insect, the following measures can be taken:
The main results are as follows: (1) before late August, the trees were covered with plastic film to prevent the larvae from entering the soil and overwintering.
(2) the trees were covered with plastic film before the end of March to prevent the overwintering larvae from being unearthed.
(3) to master the harmful period of the first generation larvae, timely spraying such as 50% dibromophos emulsion, 2.5% deltamethrin and 2000-3000 times of deltamethrin have good results.
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