MySheen

How to prevent the harm of red spiders to cherry blossoms?

Published: 2024-11-24 Author: mysheen
Last Updated: 2024/11/24, How to prevent the harm of red spiders to cherry blossoms? Most of the red spiders that harm cherry blossoms are mountain plant leaf mites, also known as mountain plant red spiders. Red spiders mainly harm the leaves of cherry blossoms. In early spring, the adults and nymphs clustered on the back of the leaves, and their mouthparts were pierced into the leaf tissue to suck the juice, so that the affected leaves showed green loss spots, and when the leaves were severe, they scorched and fell off early. The female adult of the red spider planted in the mountain is 0.5 mm long and oval, with 26 bristles on the back of the body. The body of the worm is red, which can be divided into winter and summer types: bright red and silk luster in winter; red when molting in summer, and after feeding

How to prevent the harm of red spiders to cherry blossoms?

Most of the red spiders that harm cherry blossoms are mountain plant leaf mites, also known as mountain plant red spiders. Red spiders mainly harm the leaves of cherry blossoms. In early spring, the adults and nymphs clustered on the back of the leaves, and their mouthparts were pierced into the leaf tissue to suck the juice, so that the affected leaves showed green loss spots, and when the leaves were severe, they scorched and fell off early.

The female adult of the mountain red spider is 0.5 mm long and oval, with 26 bristles on the back of the body. The insect body is red, which can be divided into winter and summer types: the winter type is bright red with silk luster; the summer type is red when molting and turns dark red after feeding. The male adult is 0.4 mm long and the end of the body is pointed. The male adult is yellowish green at the beginning of molting and then turns green and orange. There are two dark green stripes on both sides of the back of the body. Mountain red spiders have 5-9 generations a year in North China, and the fertilized female adults survive the winter mainly in the cracks in the bark of the branches and in the soil crevices around the plants. The overwintering female adults began to move in the middle and late April of the following year, harming buds and leaves. The peak period is from July to August, and the harm is the most serious.

Measures to prevent and control red spiders planted in the mountains: first, clean the countryside and eliminate the source of overwintering insects. Second, when the buds did not sprout in early spring, spraying Baume 3-5 degree stone sulfur mixture to control overwintering female adults. Third, chemical prevention and control should be timely, early detection, early spraying. You can choose 20% diclofenac EC 1500 times, 73% propargite EC 2000,3000 times, and so on. When spraying, you should pay attention to the back of the leaf. The fourth is to protect and make use of natural enemies such as mites, ladybugs and spiders.

 
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