Symptoms and control measures of leek disease in sunlight greenhouse

First, the onset of symptoms: all parts of the leeks can be diseased, with pseudostems and bulbs most affected. The leaves and calyx mostly become infected from the lower part. At the beginning, it was a dark green water-stained lesion. When the lesion spreads to the leaves and calyx, the diseased part collapses, causing it to turn yellow, sagging, and soft rot. When the humidity is high, the disease minister produces a layer of mildly sparse white mold. The bulbs were damaged, the roots were water-stained, light brown to dark brown, growth was inhibited and nutrient storage was affected. The roots were rotted brown and the root hairs were reduced. The plants stopped growing and died.

Second, prevention and control measures

1. Variety selection Choose disease resistant varieties suitable for local planting.

2, field management to fully apply the organic fertilizer, rational dense planting, improve ventilation and light conditions. Appropriate irrigation, ventilation after the water, reduce the humidity in the field, reduce the dew condensation, prevent the indoor appearance of high temperature and humidity conditions. After harvesting the leeks, the diseased leaves and debris are promptly removed.

3, the early stage of the use of chemical agents to prevent the onset of the use of 25% metalaxyl WP 400-500 times; or 58% of methothex MnZn wettable powder 400-500 times; 64% of the bad cream MnZn WP 400- 500 times liquid, 40% triethylphosphonate wettable powder 250 times spray control, every 7-10 days, continuous use 2-3 times.

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