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通过对1991~1994年调查资料整理分析:引起安庆油菜菌核病连年重发的主要原因是:①杂交油菜等中、迟熟品种大面积推广,致使旱地连作程度加重,有效菌源积累多;②油菜品种类型增多,使全程花期拉长,提高了染病机率;③常年春季多雨,气候条件适宜发病;④氮肥用量增加,油菜徒长易倒,田间郁闭,湿度加大。据此提出实行轮作、合理施肥、降低田间湿度、喷施多效唑等农业措施和适期开展药剂防治的综合治理对策。
Through the analysis of the survey data from 1991 to 1994, the main causes of perennial relapse of rape sclerotinia in Anqing are: (1) The late popularization of rapeseed in hybrid rapeseed is widespread, resulting in the continuous cropping of dry land and the accumulation of effective bacterial sources; ② increased types of rapeseed varieties, the whole flowering period elongated, increased the probability of infection; ③ perennial spring rainy, climatic conditions suitable for disease; ④ increased nitrogen fertilizer, rape trait easy to fall, field canopy closed, humidity increased. Based on this, the author puts forward some agricultural measures such as crop rotation, reasonable fertilization, reducing field humidity, spraying paclobutrazol and comprehensive management countermeasures for the proper prevention and cure of pesticide.