Occurrence and control techniques of jujube armyworm

The jujube armyworm belongs to the family Lepidoptera. Jujube armyworm harms the leaves, flowers and fruits of jujube, which seriously affects the yield and quality of jujube.

Jujube armyworm has a single feeding habit, which is only harmful to jujube and wild sour jujube, and the larvae feed on jujube leaves, flowers and fruits. There are three generations a year, and the pupa is cocooned under the bark and in the soil around the tree trunk. Eclosion began in late March and reached its peak in early April. The adults had strong phototaxis and scattered eggs were laid on smooth branchlets and leaves. The first generation larvae hatched in early May (before the Beginning of Summer), mainly jujube buds and tender leaves, emerged in the first and middle days of June (after Grain in Beard), the second generation larvae appeared in late June (around the Summer Solstice), mainly harming flower buds, tender leaves and young fruits, resulting in a large number of young fruit shedding, adults Eclosion in late July, and the third generation larvae hatched in late August, mainly harmful leaves and jujube fruits. In late September, the larvae overwintered by cocooning and pupation.

Prevention and control measures:

1. Scrape off the bark of the old forsythia tree in winter and spring, burn it centrally, and destroy the overwintering pupae.

2. In the occurrence period of adults, the phototaxis of adults are used to trap and kill adults with black light.

3. Before the larvae overwintered after autumn, grass can be bundled on the tree trunk to induce the overwintering larvae to pupate and centrally exterminate.

4. Chemical control: the first generation larvae were sprayed in the middle of May and the second generation larvae were sprayed with 1500 to 2000 times of thiazuron 3 or 2000 times of phoxim in late June. Mainly to eliminate the first generation larvae, which is the key to the control of this insect.