Onion purple spot mainly damages leaves and pedicels. After planting pedicels, damage often results in seed shrinkage, which does not fully mature and affects seed production.
Symptoms: When the leaves and pedicels suffer damage, they often develop from the tip of the leaf and the middle of the pedicel. At the beginning of the lesion, it was a water-stained, white dot, which turned to a light-brown, round or spindle-shaped depression. It continued to expand into brown or dark purple. When the humidity was high, the disease minister was full of dark brown or dark gray moldy powder. Concentric ring pattern. The lesions continue to expand and several lesions are connected to form long, large patches that cause the leaves and peduncles to die or break. The disease is prone to occur under warm and warm conditions, and it is more severe on sand, dry land, or in the absence of fertilizer.
Prevention:
First, strengthen field management. Choose loam flat, convenient drainage loam planting, apply enough base fertilizer, appropriate application of phosphorus, potash fertilizer to enhance resistance.
Second, implement rotation. More than two years of rotation with non-onion crops.
Third, use disease-free seeds. From the disease-free or light-disease site, if necessary, soak seeds with 30% formaldehyde 300 times for 3 hours and wash them after leaching. Bulbs can be sterilized with a 40°C-45°C warm water immersion for 90 minutes.
Fourth, clean the pastoral. Regularly check the development of the disease, remove diseased plants in time or remove diseased leaves, diseased pedicels, and deeply bury or burn them. After harvest, remove diseased bodies and deep plowing.
Fifth, pharmaceutical control. At the beginning of the onset, spray 75% chlorothalonil WP 500-600 times, or 64% WP 500 times, or 50% epothilone WP 1500 times, or 2% more antimycin Wet powder 30PPm, spray once every 7-10 days, continuous control 3-4 times.
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