Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 4/20/2010
Publication Date: 6/20/2010
Citation: Jaaffar, A.M., Weller, D.M., Paulitz, T.C., Thomashow, L.S. 2010. Effect of pH on the growth of Rhizoctonia spp. from cereal-based cropping systems in eastern Washington State. Phytopathology, Vol. 100, No.6,pg. S85.
Technical Abstract: Rhizoctonia root rot caused by Rhizoctonia solani AG 8 and Rhizoctonia oryzae are serious root diseases in dryland cereal production in Washington State. Isolates of Rhizoctonia spp. from fields with different cropping histories in the low- (<12 inches) and moderate- (>12 inches) precipitation zones of eastern Washington State were identified by using six PCR primer sets
specific for AG 8, AG 2-1, AG 10, AG I (Ceratobasidium spp.) and 2 groups of R. oryzae. Of 205 isolates, AG 8, AG I, AG 2-1, R. oryzae group 2, R. oryzae group 3, and AG 10 comprised 28%, 19%, 17%, 15%, 13%, and 8% of the isolates, respectively. AG 8 comprised 67% and 33% of the isolates in the low and moderate precipitation zones. The soil pH in fields in eastern Washington varies considerably (