Symptoms are also known as mulberry leaf atrophy and mosaic leaf curl disease. Another kind of dingy dwarf disease. Mainly in the spring and late autumn, causing mulberry leaf curling, wrinkling, old hard, affecting the yield and quality of spring leaves and summer leaf song. Mulberry Leaf Roll Leaf Disease, with light green to yellowish green patches appearing between the lateral veins of the leaves at the onset of the disease. The veins near the veins are still green, yellow and green mosaics or mosaics appear, and the leaf shape is not correct. Face curling, and some fissures half no lack of carving; leaf vein side prone to small tumor-like protrusions, veins browning, disease branches fine, internode shortening. Sometimes the leaves on the same branch appear in late spring, early summer or fall, and there are sometimes cases of episodic and sometimes non-obvious intermittent disease. When the disease is heavy, the diseased leaves are small, the leaf surface is obviously rolled up, the veins are browning more obviously, the knobs and spinous processes are more, the axillary buds are early, and the collaterals are numerous, the diseased plants gradually decline, but the root system does not decay. Transmission routes and disease conditions The pathogens of the disease are overwintering in the tree body, mainly through diseased seedlings, disease scions, and disease rootstocks, which spreads and spreads, among which the effect of grafting and transmitting viruses is very large, and the virus transmission rate is about 80%. The occurrence of the disease is closely related to the temperature. The temperature is lower than 25°C, and the incidence is higher than 30°C. Therefore, the incidence of the disease is mostly late spring, early summer and late autumn, and it rarely occurs in midsummer and early autumn. Old trees and poorly drained low-quality mulberry gardens are prone to onset. Insufficient or partial application of fertilizers and excessive application of nitrogen fertilizers are serious. Husang 35, white mulberry, sword and other varieties are susceptible to disease. Control methods (1) Strengthen seedling quarantine. (2) Cultivate disease-free saplings. (3) Selection of resistant varieties such as lotus leaf, early green mulberry, Quzhou blue, head lotus leaf, Husang 32, and large red seed species. (4) Strengthen the management of mulberry fields, increase the use of organic fertilizers, and timely drain water from low-lying mulberry fields to prevent moisture retention. Mark the diseased tree to prevent misuse. Vacuum Fried Onion,Dried Onion,Fried Onion Chips,Vacuum Onion Chips Huaiyang County Wanyuan Garlic Foods Processing Industries Co.,Ltd , https://www.wanyuangarlicfood.com
The pathogen MyMV called a linear virus, virus length l000nm, width 11 to 13nm; but there are also different opinions, it is not yet conclusive.