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Detailed Explanation of the Damage Characteristics and Life Habits of the Jujube Gall Midge

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The jujube gall midge, commonly known as the leaf-rolling maggot or jujube maggot, damages the young leaves of jujube trees with its larvae, causing the affected leaves to curl lengthwise toward the upper surface. Early-stage curled leaves are purplish-red, while late-stage curled leaves are mostly brownish-green. The damaged leaves gradually wither, scorch and drop off. The jujube gall midge produces 5-6 generations per year and overwinters as larvae in the shallow soil beneath the trees. In late April the larvae begin to curl leaves and cause damage, with early May being the peak damage period. The pupal stage of the first generation occurs in early June, and adults emerge in early June. In the Beijing area, it occurs in large numbers in May and June, causing the most severe damage, and the larvae mature in about 10 days. In late August

The jujube gall midge, commonly known as the leaf-rolling maggot or jujube maggot, damages the young leaves of jujube trees with its larvae, causing the affected leaves to curl lengthwise toward the upper surface. Early-stage curled leaves are purplish-red, while late-stage curled leaves are mostly brownish-green. The damaged leaves gradually wither, scorch and drop off.

The jujube gall midge produces 5-6 generations per year and overwinters as larvae in the shallow soil beneath the trees. In late April the larvae begin to curl leaves and cause damage, with early May being the peak damage period. The pupal stage of the first generation occurs in early June, and adults emerge in early June. In the Beijing area, it occurs in large numbers in May and June, causing the most severe damage, and the larvae mature in about 10 days. In late August the mature larvae begin to enter the soil and spin cocoons to overwinter.

What are the main measures for controlling the jujube gall midge

Based on the life habits of this insect, the following measures can be taken:

(1) Before late August, cover the ground beneath the trees with plastic film to block the larvae from entering the soil to overwinter.

(2) Before late March, cover the ground beneath the trees with plastic film to block the overwintering larvae from emerging from the soil.

(3) Grasp the damage period of the first-generation larvae and spray pesticides in time, such as 50% dibrom phosphorus emulsion at 500-600 times dilution; 2.5% deltamethrin at 500-1000 times dilution; and chlorbenzuron No. 3 at 2000-3000 times dilution, all of which have good results.

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