In recent years, apricot balls have been found in fruit trees such as apricots, peaches, and cherries, as well as in afforestation trees such as Meimei, Hongye, and Ziye. In some orchards and green parks, the rate of worms is 100%, and the density of larvae is as high as 300 larvae per metre. This results in the dried branches of the afflicted vines, which are debilitating and even dead. This has seriously affected the economic benefits and ornamental value.
First, the law of occurrence The worm occurs one generation a year, the first instar nymphs long oval, thick brown back, body back with white patterns. The second instar nymphs overwintered at the cracks in the shoots, and the body was surrounded by wax film. When the spring sap flowed the following year, the nymph climbed from the wax quilt to the branchlets, the mouthparts were fixed, and the sap was used for harm and no longer moved. In early April, mature nymphs began to differentiate males and females. In mid-April, they emerged as male and female mating. Incubation begins in mid-May and hatches in late May. After the nymphs hatch, they climb out of the mother's body and suck in sap on the tree trunks. The body secretes white wax. At the end of autumn, the nymphs peeled off into the second instar, and the second instar nymphs began to overwinter in October.
Second, prevention and control technology
1. Artificial control: Before the end of April, when the female adult has not laid eggs or the eggs have not hatched, use a steel brush to brush off the female clam shells on the branches and burn them together.
2, biological control: Black-Border red ladybug is the natural enemy of the insect, a ladybird can control more than 5 apricot ball female adult insects. Therefore, it must be protected and utilized.
3, chemical control: spraying in early spring before germination 4 to 5 degrees of lime sulfur agent can kill overwintering nymphs; mid-May to early June is the nymph incubation period, must seize this control period, every 5 to 6 days Two consecutive sprays of 0.3 to 0.5 degree lime sulfur or 50% of monocrotophos 1500 to 2000 times or 50% of dichlorvos 1500 times.
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