In case of serious insect damage, the leaves will be eaten up, and the tree crown will be bare, which will affect the yield, and at the same time, it is not conducive to the next year's blooming and bearing.
Generally in late July, the old larva is killed artificially, and the cocoon is burned. In winter, the eggs can be removed manually.
Generally in September, that is, before female moths lay eggs, they can use black light to trap and kill adults.
③ for larva, spray kill with 25% insecticidal double 500 times liquid.
Generally, the larvae wormed into the short branches and growth branches, so that the leaves and fruits on the short branches were all withered and fallen off, and the long branches were withered.
① in April, the adult can be killed in the morning.
② cut off the injured branches and burn them intensively to eliminate the larvae and reduce the harm.
③ strengthen management and improve tree resistance.
Spray 800 times of 80% dichlorvos and 1000 times of 40% Omethoate mixture in hazardous period.
Termites are the main pests, will eat the trunk xylem, making ginkgo can not get the normal water supply.
First of all, it is necessary to determine the nest location, which can be determined according to the termite deposits, vent holes, etc., and then drill holes and inject about 10ml of insecticide and 10% mirex into the nest. Generally, 3-7 days after the application of the medicine, the termites can all die.
Most of them occurred between June and August. Adults often gather on the back of the leaves to absorb the juice of the young leaves, which makes the leaves turn gray and white when they lose their green color.
It can be sprayed with 50% phoxim, 3000 times of Sumicidin or 1000 times of 40% Omethoate. Generally, the first spraying is conducted in the middle of June, and the second spraying is conducted in the middle and late July. If the pest is not serious, spray twice.
