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1.菜用大豆灰斑病主要危害叶片,也可侵害茎、豆荚及籽粒。幼苗受害,子叶上出现半圆形深褐色凹陷斑,适温多雨时,病害扩展迅速,造成病苗枯死。叶片染病,初现褪绿小圆斑,后逐渐形成中央灰色至灰褐色、四周红褐色的蛙眼斑,直径为2～5毫米;湿度大时,叶片背面病斑中央生出密集的灰色霉层;发病重时,病斑布满整张叶片,致使病叶干枯。茎部染病,产生椭圆形病斑,病斑中央褐色,边缘红褐色,密布微小黑点。豆荚染病,病斑圆形或椭圆形,中央灰色,边缘红褐色。籽粒染病,病斑圆形或不规则形,中央灰白色,边缘暗褐色,病斑
1. Vegetable soybean gray spot disease main hazards leaves, but also against stems, pods and grains. Seedling victims, cotyledons appear dark brown depression spot, when the temperature is warm and rainy, the disease spread rapidly, causing the disease to die. The leaves began to appear chlorotic small round spots, gradually forming a central gray to brown, surrounded by reddish-brown frog eye spot diameter of 2 to 5 mm; humidity is high, the leaf back of the central plaque gave birth to dense gray mold ; When the disease is severe, the lesion covered the entire leaf, resulting in diseased leaves dry. Stems infected, resulting in oval lesions, central spot brown, edge reddish-brown, dense black spots. Pods infected disease spot circular or oval, central gray, red-brown edge. Infected grains, round or irregular spots, central gray, dark brown edge, lesion