Control methods of Ligustrum lucidum

Distribution: northeast China, Henan, Jiangsu, Zhejiang; Korea, Japan, Soviet Union.

Harm: damage to Cunninghamia lanceolata, privet, cloves, water wax, small wax. The larvae spin silk to form a net and feed in the net. The insect population often forms a large silk net, covering the whole tree, eating up the leaves, affecting the growth of the trees and causing the trees to die.

Morphological features: (adult) the body length is 12ml 15mm, the wingspan is 31mi 40mm, and the body wing is white with silk luster. The outer margin of the wing has two pairs of black spots, which are listed between the veins and inside the veins, the forewing has a large black spot at the upper end of the middle chamber, and the wing base has three black spots on the veins. (egg) ovoid, 0.5 mm long, the first birth is yellowish, gradually turning to turquoise, with pearl luster. (larva) about 20 mm long, black head, yellowish brown detachment line; yellow body, with many irregular black spots, large spots on the 1st-5th ventral segment. (pupa) 18 mm long, light yellow, with many black spots.

Living habits: two generations a year, overwintering with small larvae on branches, and the larvae can still feed at noon in high temperature or sunny days. In Zhejiang, at the beginning of April, the larvae were active, netted and overfed in the crown, and the feeding range was in the canopy and branches, rarely transferred. When the leaves in the net were eaten up, the larvae transferred, netted first, and then fed. In the middle of May, the larvae mature and pupate on the screen. The adults emerged from late May to early June, and the emergence time was mostly in the daytime. Adults lie still on the screen during the day, and they can also move and mate on the screen. Eggs are often laid on the screen, hanging one by one on the screen, such as the canopy under the net, the leaves on the branches are eaten up, and the adults also fly away from the original screen and lay eggs on the nearby intact branches and leaves, but the adults do not fly too far away. The first generation larvae caused damage from the first ten days of July to the end of August, and the damage was the most severe in the first and second ten days of August. The second generation larvae hatched in early September and overwintered gradually in October.

Prevention and control methods: 1. This insect can not live without the screen, which can remove the screen and destroy the pupa and eggs. 2. Remove the screen during the larval stage, spray 80% dichlorvos EC, 90% crystal trichlorfon 1000-1500 times, or fumigate with dichlorvos smoke agent.