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玉米,高粱和谷子纹枯病在华北地区发生极为普遍,并日趋严重。作者从该区采集作物病组织,进行丝核菌分离、鉴定和致病性测定,从玉米上得到77个丝核菌分离物,分属立枯丝核菌(Rhizoctonia solani)中的AG—1—IA(68.8%)AG—1—IB,AG—3,AG—5等菌丝融合群(AGs)和禾谷丝核菌(R.cerealis)中的CAG—3,CAG—6,CAG—8,CAG—9,CAG—10等菌丝融合群,(CAGs).从高粱上得到26个分离物,分属AG—1—IA(77%),AG—4和AG5.谷子上得到30个分离物,分属AG—1—IA(80%)。和AG—4。另外从莠子上得到3个分离物,分离AG—1—IA和AG—4。主要融合群在不同作物和地理上有一定的一致性.致病性测定表明,AG—1—IA的分离物对寄主作物有极强的致病性,但分离物间的差异明显,AG—5的分离物对高粱致病力较强,CAG—10的分离物对玉米有较强的致病力,其余各融合群的分离物致病力均较弱。
Corn, sorghum and millet sheath blight are extremely common in North China and are becoming more and more serious. The authors collected crop diseased tissues from this area for Rhizoctonia solani isolates, identification and pathogenicity determination. 77 Rhizoctonia isolates from corn were obtained, belonging to AG-1 in Rhizoctonia solani CAG-3, CAG-6, and CAG-3 in mycelial flocks (AGs) and R. cerealis such as AG-1 (68.8% 8, CAG-9, CAG-10 and other mycelial fusion groups (CAGs) .A total of 26 isolates from sorghum were obtained from AG-1-IA The isolates belong to AG-1-IA (80%). And AG-4. In addition, three isolates were obtained from the herbivores to separate AG-1-IA and AG-4. The major fusions were consistent in different crops and geographies.The pathogenicity tests showed that the isolates of AG-1-IA were highly pathogenic to host plants, but the differences among isolates were obvious. AG- 5 isolates had stronger pathogenicity to sorghum. The isolates of CAG-10 had stronger pathogenicity to maize and the pathogenicity of isolates of other fusulin groups was weaker.