Peach powdery mildew (Peach powdery mildew), the host has peach and apricot, plum, cherry, plum, cherry, etc., mainly damage leaves, shoots, and sometimes harm the fruit. How much can cause early deciduous summer, brown spots caused by the disease.
Symptoms: The leaves are infected, and the back of the leaf is white and the edges are not clear. The mycelium is yellowish-green on the surface. In severe cases, the mycelium covers all the foliage. The young leaves were damaged and the foliage was uneven and wavy. In the autumn, black beads appear in the mycelium, which is the closed shell of the pathogen. New shoots are damaged. White mycelium also appears before aging.
The fruit was damaged. From May to June, white round and sometimes irregularly shaped hyphae clusters appeared in powder form. Tissues near the epidermis then withered and formed light brown lesions. Afterwards, the lesions were slightly sunken and hardened.
Pathogens Fungal ascomycetes Submonas phylum Erysiphe graminis Triphasorum monocysticides Podosphera tridactyla (Wallr.) de Bary, Sphaerotheca pannosa (Wllr.) Leveille var. Persicae? Worornichi.
The onset of the disease? The pathogen formed a black closed crust shell after October, so that winter was passed, and ascospores were released for early infection in late spring, and further spread and spread after the formation of conidia. Conidial germination temperature is 4-35°C, suitable temperature is 21-27°C, under direct sunlight for 3-4h, or under scattered light for 24h, it loses germination power, but it has stronger frost resistance, and it encounters late frost. Still germinating.
Control methods
1. Spray 0.3 at the onset. Be lime sulfur or 25% triadimefon 3000 times, 70% thiophanate-methyl wettable powder 1500 times liquid l 2 times.
2. After the fall, clear up the orchard, sweep away fallen leaves, and burn them together.
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