Symptoms mainly affect the leaves, vines and pods, mostly from the leaves. At the beginning of the disease, the white-floured pale yellow dots appeared. Afterwards, they were enlarged and irregularly shaped. They were commensurate with each other. The diseased surface was covered with white powder, and the back of the diseased surface was brown or purple patches. The spread of the disease spread to the entire leaf, causing rapid yellowing of leaves. Stem and infestation also showed small patches, which were full of stems and stems, causing yellow stems and shriveled stems. The late disease department showed a small black spot, that is, closed shell. Transmission routes and pathogenic conditions The pathogens can infect the seeds through pea pods, which is an uncommon seedborne disease transmitted by powdery mildew. The mycelia on the closed capsular and diseased tissues of the diseased body also overwintered the river, and the early infestation of the ascospore was carried out by the airflow and rain spatter. The diseased part produces conidia for repeated infections, so that the disease gradually spreads and spreads, and the late-stage pathogens produce closed-cylindrical shells overwintering. In warm areas, pathogens were contaminated by conidial transmission among host plants. There was no significant wintering period and no closed shells were produced. In addition to invading peas, it can also invade other crops such as legumes, solanaceae, cucurbits, etc., 13 families and more than 60 kinds of crops. Dew and damp conditions are popular in the warm and cold nights, but even if the weather is dry, the disease can still occur seriously. There is a difference in resistance among varieties, and fine peas are more resistant to peas. Control methods (1) Select disease-resistant varieties such as "Zhong ye 2" suitable for planting in Beijing, Zhejiang, and Hubei in accordance with local conditions. "Jinhard 1" and "Jinruo 1" are suitable for planting in parts of North China and northwest, "Green Pea Pea†and “Little Green Peas†are suitable for some areas in North China. “No Needle No. 1 Peas†is suitable for the southwest, south China, and the “hybrid pod pea†(Ningyang Double Flower Pea) is suitable for South China. Regions, etc., can be introduced and promoted by each other. (2) Rotary pea root exudates have an effect on the rhizobia activity and root growth of the plant in the following year. (Sun) sowing disease-free seeds with seed weight of 0.3% of 70% thiophanate-methyl or 50% carbendazim wettable powder plus 75% chlorothalonil wettable powder (1:1) mixed seed dressing and sealed 48- Seeding after 72 hours can delay the onset of illness by about one month. (4) Grasping the cultivation and disease prevention measures centered on fertilizer and water, such as rational dense planting and clear trench rehearsal. (5) Pharmaceutical control See broad bean powdery mildew. Urit Medical,Medical Analyzer,Medical Test Paper,Laboratory Analyzer Changchun Medicon Technology Development Co., Ltd , https://www.teststrip.pl
The pathogen Erysiphe pisi DC. called pea powdery mildew, belonging to ascomycete subphylum fungi. Conidia barrel to column, colorless, unit cell, size 25.4-38.112.7-17.8 (μm). Ascosi shell dark brown, spheroidal, diameter 92-120um, wall cells irregular, polygonal, diameter 7.1-20.3um. Attachment filaments, 12-34 roots, 1-3 times the ascaria shell. Ascospora 5-8, oval, size 55.9-76.235.6-42.2 (μm), 3-5 ascospores, oval, with yellow, size 20.3-25.412.7-15.2 (μm).