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小麦根腐病是广东小麦重要病害之一。病原菌在干旱土壤中可存活281天以上,在淹水土壤中80天使死去,“麦→稻→稻”水旱轮作制的地区不存在土壤带菌问题。室外堆放的病秆所带分生孢子可存活281天以上,但菌丝体在220天以前死去,不能产孢传播。室内人工接种有6种作物和11种杂草感病,其中甘蔗、茭白、雀稗、纤毛鸭咀草和川谷为前人所未报道。但大田调查结果,除小麦外迄今未见有自然感病寄主。种子带菌很普遍,是广东小麦根腐病的主要初侵染源。 本试验对Ledingham和Chinn的土壤孢子数估算法作了改进,测定方法简单,较为准确,可供田间孢子量测定之用。
Wheat root rot is one of the important diseases of wheat in Guangdong. Pathogenic bacteria can survive for more than 281 days in arid soil, die in flooded soil for 80 days, and soil-borne problems do not exist in the areas drilled with “wheat → rice → paddy”. Conidia deposited outside the stalk can survive more than 281 days, but the mycelium died before 220 days, can not sporulation. Indoor artificial inoculation has 6 kinds of crops and 11 kinds of weed diseases, of which sugar cane, razor clam, Paspalum, crested duckweed and Chuan Valley has never been reported. However, as a result of Daejeon’s investigation, so far no natural host of disease has been found except wheat. Seed carrier is very common and is the main source of initial root rot in Guangdong wheat root rot. In this study, Ledsham and Chinn soil spores estimation method was improved, the determination method is simple, more accurate, available for field spore determination.