What are the diseases and insect pests of cherry blossoms?

What are the diseases and insect pests of cherry blossoms? How to prevent and cure it? There are many kinds of diseases and insect pests in cherry blossoms. The common diseases and insect pests are as follows: first, perforated brown spot occurs from May to June, the leaves appear purple-brown spots, and then gradually expand into a circle. After drying and shrinking, the spot becomes a small hole, and most of the pathogens spend the winter on diseased branches and leaves. The optimum temperature for development is 25 ℃ to 28 ℃. It is spread by wind, which is conducive to infection, tree weakness and poor drainage in rainy season. When the ventilation and light transmission is poor, the disease occurs seriously. Control methods: (1) strengthen cultivation management, reasonable pruning, and pay attention to cut off diseased shoots, clean up diseased leaves and burn them in time, so as to create clean growth conditions for plants. (2) before the germination of new shoots, 3 to 5 Baomedu stone sulfur mixture can be sprayed. During the onset of the disease, 160x Bordeaux solution or 1000 to 2000 times solution of 50% benzoite wettable powder or 15% Dysen zinc solution can be sprayed. Second, the yellow-green round spots appeared on the summer leaves of leaf blight, then turned brown and scattered with black particles, and the diseased leaves died but did not fall off. Control methods: (1) remove and burn diseased leaves and spray Bordeaux solution before germination. (2) spray 65% Dyson zinc wettable powder 500 times from May to June, once every 7 to 10 days, 2 to 3 times in a row. Third, root cancer mainly occurs at the base of the trunk, sometimes on the root neck or lateral root, and the disease produces tumors. At the initial milky white or fleshy color, it gradually turns brown or dark brown, round, rough, uneven and cracked. After infection, the root system is underdeveloped, the fine roots are very few, the aboveground growth is slow, the tree potential is weak, and when the leaves are yellowing, early falling, or even the whole plant dies. Prevention and treatment methods: (1) seedlings infected with root cancer must be destroyed centrally. Before planting, it is best to soak them with 1% copper sulfate for 5 to 10 minutes, then wash them with water, and then plant them. (2) the tumor and its surrounding tissue can be completely removed by knife saw. (3) the soil around the diseased plant can also be disinfected with sulfur powder according to the dosage of 50 to 100 grams per square meter. At the same time, pay attention to soil improvement. Click for more cherry blossom planting techniques click to get more flower planting techniques