Control methods of American white moth

Bind the grass handle to the tree trunk, after the larvae pupate in the grass handle, remove the grass handle and burn it centrally. Contact stomach poisons such as 1000 times of 80% dichlorvos EC, 2500 times of 2.5% deltamethrin EC and 2300 times of 4.5% cypermethrin EC can also be used for three-dimensional, comprehensive and meticulous spraying.

1. Physical prevention and control methods

Making use of the habit of pupation of the larva under the tree, the grass handle can be bound on the tree trunk. After the larva pupates in the grass handle, the grass handle is removed and burned centrally.

After artificial cutting, the adults began to lay eggs in the middle and last ten days of May, and the tissues were artificially searched for the egg blocks on the leaves, removed and destroyed. From late May to early June, the 1st-3rd instar larvae netted and clustered in the canopy, and the leaves of the injured plants showed white film shape and withered yellow, leaving only leaf veins, and scattered feeding entered the overeating stage after the 4th instar. Carefully look for the net screen of American white moth larvae every 2-3 days. Once the net screen is found, cut it off together with the twigs and destroy it.

2. Chemical control methods.

Early detection and early prevention and control should be achieved in the larval damage period. Contact stomach poisons are mainly used, such as 1000 times of 80% dichlorvos EC, 2500 times of 2.5% deltamethrin EC and 2300 times of 4.5% cypermethrin EC for three-dimensional, comprehensive and meticulous spraying.