Valentín Torres, Suheidy.

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Its-5.8S-rDNA region and disease severity comparison of Rhizoctonia solani Anastomosis groups isolated from common bean (Phaseolus vulgaris L.) at Isabela, Puerto Rico
(2010) Valentín Torres, Suheidy.; Vargas, María M.; College of Arts and Sciences - Sciences; Beaver, James S.; Varela, Felicita; Siritunga, Dimuth; Department of Biology; Aponte, Nilda
Rhizoctonia solani is a widespread soilborne pathogen of common bean (Phaseolus vulgaris L.). This major pathogen is a species complex classified in 14 anastomosis groups (AG). Some AGs can cause web blight (WB), one of the most important diseases of bean plants planted in the Caribbean, while others are responsible for root rots (RR). Knowledge of these subgroups and their interactions with plant hosts represents an essential contribution to the mycological and plant breeding communities. For this reason the variability of web blight and root rot isolates were compared by detecting differential reactions among bean lines using a detached leaf method in leaf evaluations and a mycelia suspension technique in root evaluations. Disease severity evaluations demonstrated that line PR0401-259 was resistant to WB and line PR0650-27 expressed moderate levels of RR resistance. The most aggressive WB isolate was AG 4WB2 and the most severe RR isolate was AG 4RR1.