摘要
向日葵菌核病(根腐型)Sclerotinia sclerotiorum在吉林省发生较重,在吉林省农安县连续5年调查,植株枯死率平均为5.13％,最重地块达17.5％,病害从6月末开始一直到9月末收获时均能发生。病情的消长呈多峰曲线。病菌浸染根颈、主根或侧根后蔓延至茎,病害由带病种子和土壤里的菌核侵染所致。重茬地发病严重,生育期(5—9月)降雨量和发病率呈正相关(r=0.98826)。
The Sclerotinia sclerotiorum of sunflowar(root rot type)is prevalent in Northeast of China.For 5 years to survey NongAn country of Jilin Province S.scleroliorum incidence was 5.13%,the highest incidence reached 17.5%.The disease occurred from late June to harvest.The incidence development as running mean curve.At the begining,the pathogen invaded the sunflower through the root collar,main root and rootlet,most through the main root,it is supposed to be seed borne or invaded by sclerotia in soil.After detected,it was shown that all the seeds from various places and different varieties could be infected.The more continuous cropping has the more sclerotia,and the disease was more heavy.During the growing period,the disease incidence increased with the rian fall from May to September,and the sclerotia more near the plants the disease showed more heavy.
出处
《中国油料》
CSCD
北大核心
1991年第2期63-65,共3页
关键词
向日葵
根腐型
菌核病
发病条件
Sunflower
Root rot type of Sclerotinia
Occurrence
