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1大豆根腐病发生的症状和影响因素大豆根腐病在大豆整个生育期都可发生,病原菌侵染植株的根、茎、叶和部分豆荚,引起根腐、茎腐、植株矮化,枯萎和死亡。幼苗症状表现为点状,扩大后呈菱形、长条形不规则形大斑,病重时病斑呈红褐色或黑褐色,皮层腐烂呈溃疡状。严重时猝倒死亡。成株期植株受浸染后症状首先表现下部叶片变黄,随后上部叶片逐渐变黄并很快萎蔫;近地面茎部病斑黑褐色,并可向上扩展延到l0～11节位,茎的皮层及髓变褐,中空易折断,根腐
1 Soybean root rot symptoms and influencing factors Soybean root rot can occur throughout the growth of soybean, the pathogen invades the plant roots, stems, leaves and some pods, causing root rot, stem rot, plant dwarf, withered And death. The symptoms of seedlings showed dotted shape, rhomboid enlarged when enlarged, irregular big shaped plaque with long strip, reddish brown or dark brown when diseased, and ulcerated cortex. Catastrophic death in severe cases. The symptom of the adult plant was firstly manifested by the yellowing of the lower leaves, followed by the yellowing of the upper leaves and the rapid wilting; the near-surface stem spots were dark brown and could extend upwards to l0 ~ 11 nodes, and the cortex of the stem And marrow brown, hollow easily broken, root rot