Prevention of powdery mildew
[Symptoms] mainly damage the leaves. Leaves covered with white mold (initial) and pink spots (later). This white mildew and pink spots are both the symptoms of the disease and the symptoms of the disease (spores and conidia of pathogens). In severe cases, the plants appear white outside and are quite impressive. The photosynthesis of the diseased plants was blocked, and the leaves eventually became yellow and easily fell off. 3Ply Face Mask, Disposable 3ply Face Mask,Non-Woven 3ply Face Mask,3ply Face Mask with Ear Loop Ningbo Wellway Optoelectronic Technology Co.,Ltd , https://www.wellwayopto.com
[Pathogen and Pathogenic Characteristics] The pathogen is the Oidium sp. [[Oidium sp.]]. In cold regions, the pathogens overwinter in the soil with their sexual fruiting pod shells with the disease. In warm areas, pathogenic bacteria mainly asexually invade and re-invade with non-sexual conidia to complete the annual cycle of disease, and there is no obvious wintering period. Warm and humid weather or planting conditions are conducive to disease. However, the spores of the pathogen have drought-resistance characteristics and can still germinate and infect pathogens under high temperature and drought weather conditions.
ã€Prevention methods】It is necessary to spray and prevent disease control as soon as possible. Like rust, powdery mildew is sensitive to triadimefon as well as to organic or inorganic sulfur fungicides. Before the onset of illness, spray no less than 45% lime sulfur compound crystals or paste 300 times continuously, or 50% colloidal sulfur or supermicro sulfur suspension 200 to 400 times, or 15% Triadimefon 2000 after the disease. Doubling, or 70% mancozeb 600 times, 2 or 3 times, about 7 days (colloidal sulphur, lime sulfur, supermicro sulphur suspension) or 10 days (mancozeb) up to 20 days (Triadimefon) spray 1, alternating application, spray even spray foot, can prevent disease control.