DANSHEN BASAL ROT CAUSED BY RHIZOCTONIA SOLANI IN VIETNAM.

Abstract

             Basal rot significantly damaged danshen cultivation in Thanh Tri, Hanoi in 2013-2014. The pathogen, Rhizoctonia solani, was consistently isolated from the disease samples. The identification was confirmed by pathogenicity test folowing Koch’s postulate. The optimum conditions for the development of R. solani causing danshen basal rot were 25⁰C and pH 5-6. In the 2013-2014 danshen crop, the disease appeared at the end of November, then gradually increased and was most severe in early April of the next year. The disease incidence decreased from mid April to harvest time when the temperature increased. This is the first report of the disease in Vietnam.