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小麦根腐病又称根腐叶斑病或黑胚病、青枯病,分布很广,尤其是多雨年份和潮湿地区发生更重。小麦感染根腐病后,常造成叶片早枯,影响籽粒灌浆,降低千粒重。穗部感病后,可造成枯白穗,对产量和品质影响更大。种子带病率高,可降低发芽率,引起幼根腐烂,严重影响小麦的出苗和幼苗生长。发病症状小麦各生育期均能发生。苗期形成苗枯,成株期形成茎基枯死、叶枯和穗枯。由于小麦受害时期、部位和症状的不同,症状表现常因气候条件而不同,在干旱或半干旱地区,多产生根腐型症状。在潮湿地区,除根腐病症状外,还可发生叶斑、茎枯和穗颈枯死等症状(表1)。
Wheat root rot, also known as root rot leaf spot or black spot disease, bacterial wilt, is widely distributed, especially in wet years and humid areas occur more seriously. Wheat root rot infection, often caused by early leaves dry, affecting grain filling, reducing 1000-grain weight. Spike infected, can cause dry white spike, the greater impact on yield and quality. High seed prevalence, can reduce the germination rate, causing young root rot, seriously affecting the emergence of young wheat and seedling growth. Morphological symptoms can occur in all growth stages of wheat. Seedling blight formation at seedling stage, the formation of adult stem base blight, leaf blight and ear blight. Due to the different stages of the wheat damage, the different parts and symptoms, the symptom manifestations often vary according to the climatic conditions, and more root-rot symptoms occur in arid or semi-arid areas. In wet areas, in addition to the symptoms of root rot, but also leaf spot, stem blight and panicularis symptoms (Table 1).