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一、大豆霜霉病 1、症状:霜霉病在大豆整个生育期里均可发病,主要危害叶片和子粒。植株受害后叶片产生黄绿色斑点,病斑扩大后呈黄褐色,叶背后和豆粒上都附有灰白色霉层。 2、防治方法:可用70％敌克松,按种子重量的0.3％拌种,也可用50％福美双,按种子重量的0.5％拌种。在发病初期,可用50％多菌灵可湿性粉剂500倍液,或用75％百菌清可湿性粉剂700倍液,也可用35％瑞毒霉可湿性粉剂600倍液,每公顷喷洒药液750公斤。
First, the soybean downy mildew Symptoms: Downy mildew in the entire growth stage of soybean can be disease, the main hazard leaves and grains. After the damage of plants, the leaves produce yellow-green spots, lesion expanded yellowish brown, leafy back and beans are attached to the gray mold layer. 2, prevention and control methods: available 70% of the enemy clamshell, seed dressing by 0.3% by weight, also available 50% thiram, 0.5% by seed weight seed dressing. In the early stages, available 50% carbendazim WP 500 times, or with 75% chlorothalonil WP 700 times, can also be 35% Rana mold WP 600 times, spraying liquid per hectare 750 kilograms.