Garlic white rot
Symptoms: Infected plants generally develop yellow or yellow-brown streaks from the tip of outer leaves and develop into leaf sheaths and inner leaves. The plants grow slowly and are shorter than normal plants. The pseudostems become soft and rot. The victimized organization is grayish black with a grayish white mycelium layer and black sclerotia. In the affected area of ​​the diseased garlic, the initial epidermis appeared immersed lesions. The lesions were subsided, the edges were colorless or light brown, and there were white hyphae in the depressions, which later produced black sclerotia inside and outside the tissues. When the roots become infected, they are initially immersed in water and later become soft and rot. In late spring and early summer, when the weather is rainy, the condition develops rapidly. When the temperature is high and dry in summer, the condition progresses slowly. For long-term continuous cropping, the poorly-drained plots are more serious.
Prevention: First, avoid continuous cropping, implement 3 to 4 year rotation. Second, choose garlic with low groundwater level and well-drained land, strengthen soil conservation and reduce surface moisture. Thirdly, regular field inspections were conducted to find the central diseased plants in time, and the root zone was dug deep and buried when no sclerotia were formed. Fourth, prior to sowing, the seed flaps were dressed with 15% triadimefon wettable powder or 50% thiophanate-methyl wettable powder. The dosage was 0.3% of the weight of the species. The method of seed dressing is to first dissolve the powdered powder with an appropriate amount of water, and spray the mixture in a sprayer to dry the seed and spray it. Fifth, in the early onset of the field, spray 50% Sucline WP 1500 to 2000 times, or 25% carbendazim WP 400 to 500 times.
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