A: The activity of the red spider is related to environmental conditions. The most suitable temperature for its activity is 25 to 35 degrees Celsius, and the relative humidity is 35% to 55%. The insect pests are bred by larvae, juveniles, and rufous-feeding sap on leaf buds and leaves. The chlorotic small spots appeared in the initial leaves of the damaged plants and gradually expanded into pieces. In severe cases, the leaves showed yellowish color, falling leaves in advance, resulting in decreased yield and quality. The prevention and control of this pest must be combined with the winter management of jujube trees in the dormant period to scrape the old curled bark and burn them in order to eliminate the overwintering insects. In addition, prior to the germination of the jujube tree, spraying 5 Baume degrees of lime sulfur has a certain control over the overwintering pupa in the jujube stock. After 5 to 6 months, when the density of insect population reached an average of 0.5/leaf, acaricide should be used for prevention and treatment in time. According to the insect forecast, when the average amount of leaf pods is 0.5 or more, spraying 2% avermectin 2000 times or 10% aftelop 1500-2000 times can control the pest; the jujube tree with high density of worms Can spray 2-3 times, once every 10-15 days.
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