Symptoms The common field symptoms of mulberry mosaic include mosaic, ring-shaped leaves, reticular leaves, and filamentous leaves. The mosaic leaves are dark green, light green and yellow-green leaves or mottled leaves. The ring-shaped leaf type refers to the concentric ring-shaped ring spot where the middle size of the leaf surface is green and the surrounding area is light green. The main veins, lateral veins, and sinusoidal veins of the reticular leaf-shaped leaf are green and probed. The mesophyll tissue between the veins is discolored, and the leaves now have reticular chlorotic spots. The filamentous leaflets become smaller and the mesophyll at the tip of the mesophyll or the entire leaf disappears, showing a filamentous or ribbon shape. Transmission routes and disease conditions Mulberry mosaic virus is mainly wintering in mulberry branches and is transmitted through grafting or insects. Diseased mulberry seeds do not transmit virus, and friction inoculation and virus transmission are also difficult to succeed. Mulberry varieties, temperatures, and harvesting methods affect the occurrence of the disease. In general, early spring temperatures of 15°C, prone to ring-spot symptoms, and large numbers of 425 to 28°C at 20 to 24°C are prone to mosaic and filamentous leaves and reticular mosaics. In Guangdong, the onset of disease begins in March of each year. From April to May, it enters the peak of the onset of disease. Since the temperature rises later, there is a common epidemic in high-temperature conditions. The difference in disease resistance among the varieties is obvious: 40 genera of Lunjiao are highly resistant to immunotype; Guangdong Jingsang and Kangqing 10 have certain resistance; Trial 11 and Sha 2 Lun 109 are susceptible. Control methods (1) Selection of resistant varieties such as Lunjia 40. (21 mortuary mulberry fields or regions that adopt annual harvesting and cutting 40-60cm harvesting methods, avoiding the peak of disease incidence can reduce the incidence. (3) When using vegetative propagation, pay attention to the selection of disease-free seedlings for scion or rootstock . Green Salt,White Quartz,Dragon Tooth,Purple Quartz Henan Qiancuntang medicial technology co.ltd. , https://www.qctchineseherb.com
Pathogens are caused by multiple viruses such as Mulberry ring spot virus (abbreviated as MyRSV). Mosaics and filamentous leaves were caused by infection with a linear virus. The mosaic-shaped linear virus was 1000 nm in length and 16 nm in width; the filamentous virus was 500 nm in length and 12 nm in width. The loop leaf virus is a spherical virus with a diameter of 26 nm.