The disease mainly damages the leaves. When the seedling grows to 5-6 leaves, and when the height is about 17 cm, it enters into a long-term morbidity. It starts from the middle of the outer leaves or the tip of the leaf and spreads upwards or downwards. The surface of the diseased area is covered with grayish or brownish brown layers, and the diseased and healthy borders are not obvious, gradually turning yellow-green, and then grayish green and dry. The middle part of the leaves became infected, and the diseased part gradually drew and drooped or died from the disease. When the damp leaves are rotted, the rain falls on the rhizosphere and shrinks and twists when dried. Frequently mixed with purple spot.

Second, control methods

1. In early spring, seedlings (bulbs) are kept in disease-free plots and stored dry. Before planting, choose another plant once. After drying, use a mixture of 72% wet mildewed WP or 58% radomeril WP 1000 times and 72% 10 million units of agricultural streptomycin soluble powder 4000 times. Seed soak for 30-40 minutes, air dry and colonize with medicine.

2, the implementation of 2-3 years and crop rotation outside the onion and garlic, and to choose the terrain Gaozao, loose soil layer, drainage and irrigation convenient sandy loam soil cultivation. Apply organic manure, increase potassium fertilizer, enhance plant resistance, and keep the field moist without excessive moisture.

3. The central diseased plant was found at the early stage of the disease and should be removed immediately and taken to the field for deep burial or burning. When the seedling height is 15 cm, spraying prevention can be started. It can spray 72% mildew net wettable powder 500 times liquid, or 64% antivirus powder wettable powder 500 times liquid, spray once every 7-10 days; it can spray 58% at the early stage of disease. Ledomil 500 times, or 50% acetaminophen WP 800-1000 times, spray every 7-10 days, even spray 2-3 times.

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