Coriander planting: what is parsley powdery mildew?

What is parsley powdery mildew? What harm does parsley powdery mildew have? Also ask experienced netizens to guide the prevention and control of coriander powdery mildew, the harm and control methods of parsley powdery mildew are sorted out below for netizens' reference. The harm of parsley powdery mildew: the aboveground parts of coriander plants can be infected, but mainly damage leaves, stems and flower rachis. The disease first appeared on the leaves near the ground, and then expanded into white powder spots on the mildew spots, which were born on both sides of the leaves; the stem infection mostly occurred in the nodes, and when the conditions were suitable, the white powder was quickly covered with flowers and fruits, mostly spreading upward from the lower part of the plant, and the hyphae changed from white to light brown in the later stage, and many black particles were produced in the diseased part. The ascomycete of the pathogen. The cause of powdery mildew of parsley: powdery mildew overwintered on the residual body with closed cysts, produced ascospores for primary infection when conditions were suitable in the next year, and formed a large number of conidia on the disease spot for re-infection after the disease. most of the collected plants were infected at the flowering stage, and the closed cysts began to form in autumn. High soil moisture, too much nitrogen fertilizer, lack of potassium, overdense plants or weeds are easy to occur. The control methods of parsley powdery mildew are as follows: 1. Select varieties resistant to powdery mildew and strengthen the management of temperature and humidity in the greenhouse. 2. After harvest, the disease remains should be removed in time to reduce the source of overwintering bacteria. 3. In the early stage of the disease, the shed can choose the dust method or the smoke method. Spray more than 10% 100 dust in the evening, every 667 tons of 1kg or apply 45% chlorothalonil smoke remover, every 667 tons 250 grams, light the smoke overnight with a dark fire. 4. In the open field or in the greenhouse, you can choose 30% Teflin wettable powder 1500-2000 times or 50% sulfur suspending agent 200 times 300 times, 2% Wuyisin water agent or 2% agricultural anti-120 water agent 150 times, 15% triadimefon (triadimefon) wettable powder 1500 times, 25% triadimefon (triadimefon) 3000 times, 15% triadimefon (triadimefon) wettable powder 2000 times plus 25% enemy emulsifiable concentrate 4000 times, 40% Foxing EC 9000 times. Once every 7 to 21 days, prevention and treatment for 2 or 3 times in succession. Stop using medicine 7 days before harvest. Click to get more coriander planting techniques click to get more vegetable planting techniques