Anastomosis groups and pathogenicity of Rhizoctonia diseased plants. Each isolate was hyphalsolani isolates from Brazil. Plant Disease 69:599-601. tipped and conformed to the current species concept of R. solani (15). Anastomosis groups (AG) of 130 Rhizoctonia solani isolates obtained from 31 plant species found Throughout the study, all isolates were in I I states of Brazil were determined. Fifty-nine isolates were assigned to AG-4, 10 to AG-3, 42 to maintained on potato-dextrose agar AG-2, and 11 to AG-i. Eight isolates did not anastomose with any of the tester strains or among (PDA) slants at 10 ± 1 C and transferred themselves, and no isolate was assigned to AG-5. Pathogenicity of 35 isolates from different p d a lly t f0 me dium. anastomosis groups on hypocotyls and/or leaves of kidney bean, soybean, red pepper, radish, periodically to fresh medium. sugar beet, and cabbage varied considerably, from nonvirulent to highly virulent. In general, The isolates were subjected to hyphal anastomosis groups lacked host specificity. The optimum growth temperature for isolates tested anastomosis pairing by using the tester varied from 20 to 30 C.
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