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Jujube leaf roller

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Also called the jujube leaf-rolling worm, its larvae bite and eat jujube leaves, jujube flowers and fruit, and can also bore into fruit clinging to leaves, causing fruit drop and greatly affecting yield. This insect overwinters as a pupa in cracks in the bark of the main trunk of the jujube tree, and from mid-March to late April the overwintering pupae begin to emerge. Occurrence periods of larvae of each generation: first-generation larvae, mid-April to late June, bite and eat young buds and tender leaves; second-generation larvae, mid-June to early August, damage jujube flowers, leaves and young fruit; third-generation larvae, late July to mid-October, especially damage leaves, and then bore into fruit. Adults hide during the day

Also called the jujube leaf-rolling worm, its larvae bite and eat jujube leaves, jujube flowers and fruit, and can also bore into fruit clinging to leaves, causing fruit drop and greatly affecting yield. This insect overwinters as a pupa in cracks in the bark of the main trunk of the jujube tree, and from mid-March to late April the overwintering pupae begin to emerge. Occurrence periods of larvae of each generation: first-generation larvae, mid-April to late June, bite and eat young buds and tender leaves; second-generation larvae, mid-June to early August, damage jujube flowers, leaves and young fruit; third-generation larvae, late July to mid-October, especially damage leaves, and then bore into fruit. Adults hide during the day and are active at night, with strong attraction to blacklight lamps.

Control methods:

1. Manual control: in winter scrape off the coarse bark of the trunk to eliminate overwintering pupae. Before the larvae of each generation pupate, tie grass at the fork of the main trunk to attract the larvae to pupate, then untie the grass bundles and burn them.

2. Chemical control: the peak hatching period of the larvae of each generation is the key to chemical control, and particular emphasis should be placed on controlling the first-generation larval period, because this generation occurs relatively uniformly and chemical control gives better results. Agents used: 50% fenitrothion at 1000-2000 times, 2.5% deltamethrin at 4000 times, 20% fenvalerate at 3000 times, or 80% dichlorvos at 1500 times; spraying must be done carefully, meticulously, evenly and thoroughly. In addition, spraying 50% parathion at 2000 times during the adult occurrence period in early spring has a killing effect on both adults and eggs.

3. Light trapping: blacklight lamps can be set up in the orchard to trap and kill adults.

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