Which pests and diseases are most likely to occur in Zhangqiu onion? How to prevent it?
Diseases that are prone to occur in the growing period of green onions are mainly frost and purple spot; insects include onion thrips, onion leafflies and onion flies. Symptoms of onion downy mildew disease, the diseased leaves distorted, pale green, wet leaves and stems of the surface of the white fungus, dry only when the white spots appear on the leaves. During the period of growth, the lesions on the leaves were ovate to long ovate, with varying sizes, yellowish-greenish color, and indistinct edges; when wet, the lesions also produced white mold; when dry, the lesions turned into spots. When the lower part of the leaf is victimized, the leaf above the diseased part hangs down. Onion brownwood disease mainly damage leaves and flowers wake up. The lesions start from the tip of the leaf or the middle of the flower wake, and spread to the lower part within a few days. The initial lesion was small, slightly sunken and purple-brown. When the temperature is high, the disease minister is full of brownish to blackish powdery mildew, often arranged in concentric rings. The lesions continued to expand, and several lesions combined to grow large strips, causing the leaves and flowers to die. Onion downy mildew and purple spot disease are fungal diseases. The diseased plants should be immediately sprayed and protected. The following agents can be sprayed alternately: 75% chlorothalonil 600-800 times and 40% carbendazim 500-600 times. Liquid, 50% thiophanate 500 times, 40% diethylaluminophosphate 400 times, 3-5 days spray again, even spray 2-3 times. Onion downy mildew can also spray 25% 1000 times Ruipo Cream. When the onion thrips and the onion leaf miner are harmful, they can spray 40% dimethoate emulsion 800-1000 times, or 50% dichlorvos EC 1000 times. Prevention of onion thrips can also spray 50% phoxim 1500 times. Onion fly, also known as onion, often larvae into the onion bulbs to feed, causing bulb rot, yellow leaves, and even plant death. The prevention and control method is as follows: When adults occur, spray 50% dichlorvos EC 1000 times. During the larval stage, 50% phoxim 2000 times or 40% dimethoate 1000 times can be used to root.
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