Onion disease can often cause serious harm.
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Symptoms? Main damage leaves and pedicels, green onions, shallots can be victimized. In the affected area, there were no obvious spots in the green and white areas, and grayish-white spots appeared after the enlargement. The resulting leaves wilted from top to bottom. The field was now a “dry tipâ€; when the humidity was high, the diseased minister sparsely robbed the white mold, and when the weather was dry, the white mold disappeared. The necropsy on the inner wall of long conical leaves shows white mycelium, which is different from onion physiological "dry tip".
Pathogens Phytophthora allii Saw. Phytophthora allii Saw. This strain is also considered to be P. nicotianae var. parasitica (Dast.) Waterhouse.
The characteristics of the disease?? Mycelium, mycelia, oocysts and chlamydospores winter in the sick body. In the south, pathogenic bacteria mainly use zoospore as a primary invasion and re-invasion body, with rain splashing or irrigation water to spread from the stomata to invade the forest. The rainy weather is conducive to hair growth, low-lying, damp, and poorly-drained vegetation. Or there is too much nitrogen fertilizer, and it is easy to develop. The comprehensive investigation of disease resistance among varieties is still lacking. Some varieties that generally exhibit strong disease resistance (as detailed in Onion purple spot disease) are also resistant to the disease, and need to be further observed in various places. .
Control methods
1, pay attention to find resistant varieties. Sorghum deep ditch cultivation, ditch drainage, timely drainage after the rain row ditch moisture; formula fertilization, timely spraying foliar nutrients, so that plants do not grow too strong, help to enhance disease resistance and reduce hazards.
2, depending on the weather conditions in time spray control Bo? Optional spray 25% metalaxyl WP, or 64% anti-virus phlegm 600 times, or 66.5% Prokary 800 times, or 72% grams Dew wet powder 600 to 800 times, or 69% Ank manganese + 75% chlorothalonil (1:1) 1000 times, 2 or 3 times, 7 to 10 days 1, alternating spray.
Symptoms? Main damage leaves and pedicels, green onions, shallots can be victimized. In the affected area, there were no obvious spots in the green and white areas, and grayish-white spots appeared after the enlargement. The resulting leaves wilted from top to bottom. The field was now a “dry tipâ€; when the humidity was high, the diseased minister sparsely robbed the white mold, and when the weather was dry, the white mold disappeared. The necropsy on the inner wall of long conical leaves shows white mycelium, which is different from onion physiological "dry tip".
Pathogens Phytophthora allii Saw. Phytophthora allii Saw. This strain is also considered to be P. nicotianae var. parasitica (Dast.) Waterhouse.
The characteristics of the disease?? Mycelium, mycelia, oocysts and chlamydospores winter in the sick body. In the south, pathogenic bacteria mainly use zoospore as a primary invasion and re-invasion body, with rain splashing or irrigation water to spread from the stomata to invade the forest. The rainy weather is conducive to hair growth, low-lying, damp, and poorly-drained vegetation. Or there is too much nitrogen fertilizer, and it is easy to develop. The comprehensive investigation of disease resistance among varieties is still lacking. Some varieties that generally exhibit strong disease resistance (as detailed in Onion purple spot disease) are also resistant to the disease, and need to be further observed in various places. .
Control methods
1, pay attention to find resistant varieties. Sorghum deep ditch cultivation, ditch drainage, timely drainage after the rain row ditch moisture; formula fertilization, timely spraying foliar nutrients, so that plants do not grow too strong, help to enhance disease resistance and reduce hazards.
2, depending on the weather conditions in time spray control Bo? Optional spray 25% metalaxyl WP, or 64% anti-virus phlegm 600 times, or 66.5% Prokary 800 times, or 72% grams Dew wet powder 600 to 800 times, or 69% Ank manganese + 75% chlorothalonil (1:1) 1000 times, 2 or 3 times, 7 to 10 days 1, alternating spray.
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