In recent days, farmers have consulted onions, dried tips and black spots. The view was purple onion spot.
The disease mainly harms the leaves and pedicels of green onions and can also harm the bulbs. Lesions usually start at the tip of the leaf or in the middle of the pedicel and then spread to the lower part. In the early stage of the disease, the lesions were slightly white spots, followed by enlarged oval or spindle-shaped lesions. When the humidity is high, the disease minister is brown to dark brown and must be arranged in a concentric ring pattern, and the diseased part is easily broken.
Control methods: At the beginning of the disease, spray 75% chlorothalonil wettable powder or 58% metalaxyl MnZn wettable powder 500 times, spray 7-10 days, and spray 3 times. Due to the smooth surface of onion leaves, in order to increase the adhesion can be added to the liquid detergent or the right amount of vegetable oil, can increase the utilization of pesticides, significantly improve the therapeutic effect.
Keep green and low-humidity environment (0°C and relative humidity 65%) in the cellar while taking care of ventilation to prevent the bulbs from continuing to develop during storage. The picture shows the green onion purple spot disease leaves.
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