Zucchini powdery mildew is mainly harmful to the leaves, and it can be infected from the seedling stage to the adult plant. The petiole and stem damage are secondary, and the disease is less. At the onset of leaf disease, white powdery round spots develop, and then gradually expand into irregular white powdery mildew spots. The lesions can be connected into pieces. The damaged part leaves gradually yellow, and many yellow-brown spots appear on the later stage lesions. In severe cases, the diseased leaves turn brown and die. The field temperature is moderate at 16-25°C, and the relative humidity is more than 80%. The cultivation density is too high, nitrogen fertilizer is used too much, the field is low and the disease is heavy. Control methods: Use 10% ningnanmycin 1500 times solution or 30% carbendazim 1500 times solution or 25% ether powder 1500 times solution (Additional agricultural activity 750 times liquid or Jin Tailong top dressing 600 times liquid to increase plant resistance Sickness) 5 to 7 days spray once, severe spray 3 to 5 days, alternate use better. Gas Detector With Output Relay RICTRON Industrial Co., Ltd is a hight-tech OEM/ODM enterprise, we are specialized to produce the products such as fire smoke alarm, carbon monoxiede alarm, gas alarm, water alarm, smoke&co or gas&co combined alarms, and other products of R&D, manufactring and sales since 2008. Lpg Gas Detector,Portable Gas Detector,Gas Detector Alarm,Lpg Leakage Detector Rictron Industrial Co., Ltd , https://www.szrictron.com
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