摘要
从高梁重病地块的病苗上,分离到立枯丝核菌(Rhizoctonia solani),串珠镰刀菌(Fusarium moniliforme),尖孢镰刀菌(Fusarium oxysporum),禾谷镰刀菌(Fusarium graminearum),罗氏白绢小菌核菌(Sclerotium rolfsii),瓜果腐霉菌(Pythiumaphanidermatum)6种真菌,其中以前三种的分离量比较大。致病性测定表明:立枯丝核菌的AG5是高梁苗病的病原菌,而其它5种分离菌只能造成微侵染,基本上不是致病菌,也不能促进立枯丝核菌对高梁幼苗的侵染。苗龄10—15天是从田间分离病菌的最好时期。多数表面消毒剂不适合立枯丝核菌的分离。不正常的温度、光照、湿度条件,容易导致错误的病原学结论,接近自然发病的条件的控制是研究病原学的关键。
Rhizoctonia solani, Fusarium moniliforme, F.oxysporum, F. graminearum, Sclerotium rolfsii and Pytliium aphanidermatum were isolated from diseased plants in heavily infected sorghum fields. Among them, the number of isolates of the former three organisms was far greater than that of the latter.The result of pathogenic detection indicated that R. solaniAG5 was the sole pathogen of sorghum seedling disease, while the other five organisms only caused subsidiary infection because of their non-pathogenic nature to cotton seedlings. The best period for isolation from cotton seedlings in field was at 10-15 days after emergence. Most of the surface ster(?)lant used in tests inhibited the isolation of R.solani from diseased tissue. Anomalous conditions of temperature, light and soil moisture easily usually interfered with the results of the etiological study.
出处
《植物病理学报》
CAS
CSCD
北大核心
1991年第2期95-99,共5页
Acta Phytopathologica Sinica
