Five methods to control apple gibberellin

Seedling quarantine: Apple small gibberellin is the quarantine object, which can be transmitted to the new area with the seedlings. Therefore, the quarantine work of seedlings out of the nursery should be strictly strengthened to prevent spread. Protection of natural enemies: in the mature larva and pupa stage, there are two kinds of parasitic wasps and one kind of parasitic fly, and the parasitic rate can reach 36% in orchards that are not often sprayed. In autumn and winter, about 30% of the larvae and pupae are eaten by woodpeckers. Artificial control: make use of the false death of adults to artificially capture the adults that fall to the ground; remove dead trees, cut off insect tips, and burn them before pupation; manually dig insects, scrape off the old skin of insect wounds in winter and spring, and dig out the larvae under the cortex with a knife. Then apply 5 degrees of stone sulfur mixture. Apply medicine to control insects: when the larvae do harm in the shallow layer, they should check repeatedly and find that there is a form of damage on the trunk, so just use a brush on it. The agent can use 80% dichlorvos EC 10 times, and 80% dichlorvos EC diluted 20 times with kerosene. Spraying to kill adults: in orchards where there is a serious occurrence of apple larvae, the damage can not be completely controlled by controlling larvae alone. on the basis of controlling larvae, continuous spraying should be carried out during the peak period of adult occurrence, such as 2000 times of pyrethrin EC, 1500 times of trichlorfon and so on. When it is found that the epidermis of more than 2-year-old branches is damaged by gibberelli, scratch the epidermis of fruit trees with a knife, and then smear the damaged area with a mixture of 4 times omethoate and dichlorvos, which occurs at any time. Cut off branches that have been seriously damaged and nearly withered to reduce the source of insects.