Hawthorn powdery mildew is also known as curved neck or face. The main damage leaves, shoots and fruits. At present, the main symptoms of the investigation at the county station are on young fruit. The young fruit is covered with a layer of white powder. The diseased part is hardened and cracked, causing malformation and stumbling to one side.
Control methods: Immediately after the onset of the disease, spray 20% triadimefon EC (triaden) 2000 to 2500 times, or 40% fluorosiliconazole 8000 times, or 12.5% ​​diniconazole wettable powder 1000 to 1500 times, or 10 % difenoconazole water dispersible granules 1500 ~ 2000 times liquid, can also be sprayed 70% thiophanate 800 times, etc., 15 to 20 days 1 time, continuous control 2 ~ 3 times. Interval 5 to 7 days, control 2 to 3 times, pay attention to the positive and negative leaves when the spray should be all medicine.
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