How to prevent the harm of red spiders to cherry blossoms?
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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How to prevent cherry root cancer?
How to prevent cherry root cancer? The tumor at the cherry root neck is caused by a bacterium belonging to the genus Agrobacterium and is called cherry root cancer. The most obvious symptom of this disease is the formation of spherical or hemispherical nodules at the root neck. The nodules are white and soft in the early stage, then gradually enlarge and lignify. The tumor surface is rough, brown or dark brown. Cherry root cancer often causes poor growth of the plant above ground, yellow leaf color, serious plant death. The pathogenic bacteria of cherry root cancer survive and overwinter in the surface layer and soil of the diseased plant cancer tumor.
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How to deal with cherry blossom root nodule disease
When planting cherry seedlings last spring, the author found nodules in the roots of individual plants. the common symptoms were different shapes, sizes, brown to dark brown colors, and cracked epidermis. It occurs on the ground or near the root neck of the ground, and at the junction of the rootstock and the scion. The damaged plants showed poor growth and dwarfing. After identification and diagnosis, the author thinks that it is a nodule cancer disease, and the seedlings should be treated before planting, the methods are as follows: 1. soak the roots of suspicious seedlings with 1% copper sulfate solution for 5 minutes.
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