Jujube armyworm

Also known as jujube leaf curler, with larvae bite jujube leaves, jujube flowers and fruits, and can eat sticking leaves and fruits, resulting in fruit drop, which has a great impact on yield. The insect overwintered as pupae in the trunk bark cracks of jujube trees, and the overwintering pupae began to Eclosion from mid-March to late April. The occurrence period of each generation larvae: the first generation larvae, from mid-April to late June, bite the tender buds and leaves; the second generation larvae, from the middle of June to the first ten days of August, harm the flowers, leaves and young fruits of jujube; the third generation larvae, from late July to mid-October, are especially harmful to leaves and then fruit decay. Adults are latent during the day, active at night, and have a strong tendency to black light.

Prevention and control methods:

1. Scrape off the rough bark of the trunk in winter and eliminate the overwintering pupa. Before pupation, each generation of larvae should bundle the grass on the trunk to induce the larvae to melt, and then remove the grass and burn it.

2. Chemical control of the peak hatching period of each generation of larvae is the key to chemical control, especially the control of the first generation of larvae, because this generation occurs neatly and the effect of chemical control is better. The use of medicament: 50% fenitrothion 1000-2000 times, 2.5% deltamethrin 4000 times, 20% fenpropathrin 3000 times, or 80% dichlorvos 1500 times, spraying requires careful, uniform and thoughtful. In addition, spraying 2000 times parathion during the occurrence of adults in early spring has a killing effect on both adults and eggs.

3. Light trapping can set up black light to trap and kill adults in the orchard.