In recent days, several kinds of onion farmers have come to consult with onion leaves and they have been carefully identified as purple onion spot. The current temperature and humidity conditions are conducive to the occurrence of purple onion spot, remind farmers to pay attention to check and prevent. The symptoms, onset conditions, and methods of control of Welsh onion are summarized as follows:

1. Symptoms. The main damage leaves and pedicels, initially watery white dots, after a light brownish round or spindle-shaped depression spots, continue to expand to brown or dark purple, often with yellow halos around, Minister of disease has a dark brown or dark gray With mydriasis arranged in a concentric ring pattern, the diseased area continued to expand, causing the whole leaf to turn yellow and die or break.

2. Transmission routes and conditions. By using mycelium in the host or with the disease in the soil over the winter, the conidia will be produced in the following year by airflow or rain, invaded through the stomata, wound or directly penetrate the epidermis, the incubation period of 1 to 4 days. Sporulation requires high humidity, germination and intrusion need to have the presence of water droplets, so the incidence of warm and humid is heavy. In addition, sandy land, dry land, early seedlings or old seedlings, lack of fertilizer and onion thrips are seriously affected.

3. Control methods. (1) Apply base fertilizer to strengthen field management and enhance resistance to disease. (2) More than two years of rotation. (3) Spray 75% chlorothalonil 500-600 times solution, 64% antivirus 500 times solution, 72% metalaxyl manganese zinc 500 times solution, 3% polyoxin 800 times solution, etc. Spray 1 time, even spray 2 or 3 times, can effectively control the spread of the disease.

Silage Wrap Film ,Width 750mm, Thickness 25um, Length 1500m,UV resistance 12-24months.

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Silage Film 750mm

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