Onions are also popular vegetables in daily life, but diseases such as downy mildew, purple spot, gray mold and anthracnose not only cause the loss of onion taste, but also serious toxins, which seriously affect its yield and threat People's health. Pesticide Network Xiaobian collects relevant disease prevention and control techniques for your reference:
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Onion disease prevention and treatment methods:
1. Select resistant varieties, implement rotation, increase application of organic fertilizer, phosphorus and potassium fertilizers and micro-fertilizers, deepen the soil for more than 40 days, improve the soil, try to eliminate and reduce residual bacteria in the soil, and reduce the source of infection.
2. Strengthen the management of fertilizer and water, especially pay attention to timely spraying Tianda 2116 to improve the disease resistance and adaptability of the plants.
3. Scientific medication.
Downy mildew, pesticide manufacturer recommends 80% ethylphosphorus aluminum 500 times solution + 64% antivirus 矾 500 times solution or 70% metalaxyl manganese zinc or ethyl aluminum phosphate zinc 500 times solution, or 72% DuPont at the beginning of the disease. Kelu 600-800 times solution, or 72.2% Plex 700 times solution, or green copper copper 800 times solution, or Trik 800 times solution, or gram cyanide 600 times solution, or 75% chlorothalonil 800 times solution Wait for prevention.
Purple spot disease, in the early stage of the disease, use 78% Cobo WP 500 times solution, or 41.5% phlegm 1500 times solution, or 75% chlorothalonil WP 600 times solution, or 64% chlorpyrifos WP 1500 Double liquid, or 50% iprodione (puffy sea) wettable powder 1000 times liquid and other prevention and treatment. Gray mold, in the early stage of the disease, with 25% prochloraz emulsifiable concentrate 1000 times solution, or Shijiale suspension 1200 times solution, or Suo Keling 3000 times solution, or 50% per WP per 1500 times solution.
Anthracnose, in the early stage of the disease, use 1500-2000 times solution of 10% high water dispersible granules, or 500 times of 25% prochloraz (100 grams) emulsifiable concentrate, or 50-800 times of 50% anthrax defame WP. Liquid and other prevention. All the above anti-disease liquids need to be mixed with 800 times neutral soap powder and alternately sprayed 600 times Tianda 2116 alternately, once every 7-10 days, continuously spraying 2-3 times. Good control results can be achieved.
If you want to cultivate pollution-free onions, Xiao Bian reminds everyone to use biological pesticides , biochemical pesticides or plant pesticides as much as possible. Even if chemical pesticides are used, low-residue products should be used to avoid phytotoxicity.