注意疫病危害可用72·2%霜霉威水剂600至800倍，72%霜脲·锰锌700倍，64%噁霜·锰锌，烯酰吗啉加丙森锌，氟吗啉加代森锌，氰霜唑，精甲霜灵防治。 疫病危害，建议，用银法利，霜霉威盐酸盐，氟吗啉 250克/升嘧菌酯48-90毫升/亩喷雾 80%烯酰吗啉20-30克/亩喷雾 69%烯酰·锰锌133-200克/亩喷雾 72%霜脲·锰锌125-167克/亩喷雾 722克/升霜霉威60-100毫升/亩喷雾 可用以上药剂结合氨基酸叶面肥+丙森锌交替使用防治。 吕兰华(山东省聊城市 山东省阳谷县农业局 擅长番茄黄瓜豇豆韭菜辣椒技术) 洋葱疫病危害，建议选用68·75%霜霉威盐·氟吡菌胺悬浮液剂800倍液、50%烯酰吗啉可湿性粉剂1000倍液等配合有机硅喷施防治。 赵娟 （山东省潍坊市寿光市 农资店 擅长番茄黄瓜辣椒丝瓜植保技术） 疫病，可以用甲霜灵或银发利或氰霜唑+四霉素或乙蒜素或喹啉铜。 洋葱疫病的防治方法 农业防治 与非百合科蔬莱轮作2年以上。选择排水良好的地块栽植，合理密植，雨后及时排除积水，加强栽培管理，合理采用配方施肥，增强寄主抗病力。收获后及时清除田间病残体。 化学防治—化学药剂参考 75% 百菌清 可湿性粉剂（微毒） 使用600~800倍液 喷雾 722克/升 霜霉威盐酸盐 水剂（低毒） 使用800～1000倍液 喷雾 25% 吡唑醚菌酯 悬浮剂（低毒） 使用1500～2000倍液 喷雾 86.2% 氧化亚铜 可湿性粉剂（低毒） 使用2000～2500倍液 喷雾 72% 锰锌·霜脲 可湿性粉剂（低毒） 使用600～800倍液 喷雾 25% 嘧菌酯 水分散粒剂（低毒） 使用1500~2000倍液 喷雾 77% 氢氧化铜 可湿性粉剂（低毒） 使用800~1000倍液 喷雾 To prevent blight, use 72.2% propamocarb aqueous solution at a dilution of 600-800 times, 72% cymoxanil-mancozeb at a dilution of 700 times, 64% oxazolidinone-mancozeb, dimethomorph plus propineb, flumorph plus mancozeb, cyazofamid, and metalaxyl-M. For blight, it's recommended to spray silverfarm, propamocarb hydrochloride, flumorph 250g/L azoxystrobin at a dilution of 48-90ml/mu, 80% propamocarb at a dilution of 20-30g/mu, 69% propamocarb-mancozeb at a dilution of 133-200g/mu, 72% cymoxanil-mancozeb at a dilution of 125-167g/mu, and 722g/L propamocarb at a dilution of 60-100ml/mu. These agents can be combined with amino acid foliar fertilizer and propineb for alternate control. Lv Lanhua (Liaocheng City, Shandong Province, Yanggu County Agricultural Bureau, Shandong Province, specializes in tomato, cucumber, cowpea, leek, and pepper technology) For onion blight, it is recommended to use an 800x dilution of 68-75% propamocarb salt and fluopyram suspension, a 1000x dilution of 50% dimethomorph wettable powder, and other spraying methods combined with silicone. Zhao Juan (Agricultural Supply Store, Shouguang City, Weifang City, Shandong Province, specializes in plant protection for tomatoes, cucumbers, peppers, and loofahs) For onion blight, metalaxyl, silver-fat-sil, cyazofamid, tetramycin, ethyl allicin, or quinoline copper can be used. Onion blight prevention and control methods Agricultural prevention and control Crop rotation with non-lily vegetables for at least two years. Choose well-drained plots for planting, plant at a reasonable density, drain water promptly after rain, strengthen cultivation management, and use a well-formulated fertilization method to enhance host disease resistance. Remove diseased debris from the field promptly after harvest. Chemical Control - Chemical Agent Reference 75% chlorothalonil WP (slightly toxic) - Use a 600-800 times dilution for spraying 722 g/L Fabamocarb HCl Aqueous Solution (low toxicity) - Use an 800-1000 times dilution for spraying 25% Pyraclostrobin SC (low toxicity) - Use a 1500-2000 times dilution for spraying 86.2% Cuprous Oxide WP (low toxicity) - Use a 2000-2500 times dilution for spraying 72% Mancozeb/Cymoxanil WP (low toxicity) - Use a 600-800 times dilution for spraying 25% Azoxystrobin WDG (low toxicity) - Use a 1500-2000 times dilution for spraying 77% Copper Hydroxide WP (low toxicity) - Use an 800-1000 times dilution for spraying