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Occurrence and control of peach scale insects
There are many species of scale insects that harm peach trees. The main thing that happened in our province was that the North Korea ball was strong, belonging to the genus Homoptera, Polygonidae and Hairball. When the amount of the disease is large, the affected branches are covered with shells and the growth of the trees is poor. In severe cases, the leaves and twigs die and even the whole plant dies. First, the law of occurrence The Korean ball takes place one year in a row. The winter twigs on the second instar nymphs begin to move in the middle and late March of the following year. The late April to the middle of May are the most prosperous period. From late April to early May Males emerged and mated with females; in May, females spawned under the shell. A female lays over 700 grains and can grow up to 1400-1500 grains. Eggs hatch from the middle of May to the end of May to the beginning of June. The hatched young nymphs climbed out of the female shell and were scattered on the shoots, leaves and fruits; winters began in September. Second, the prevention and treatment methods are based on drug killing. When the nymphs hatch in large quantities from the mother's shell, they spray 50% of the marathon 800-1000 times, 40% of omethoate 800-1000 times or 80% of dichlorvos 1500-2000 times, all of which are good. effect. However, after the nymphs spread, it is often difficult to receive the desired effect. In addition, we must pay attention to the protection of natural predators such as the black-skin beetles.