Cultural characteristics and virulence of acquired resistant isolate of Pythium vanterpoolii against metalaxyl
1993 Volume 22 Issue 1 Pages 13-20
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1993 Volume 22 Issue 1 Pages 13-20
A sensitive field isolate (U0P392) ofPythium vanterpooliiwas compared with its acquired resistant isolate against metalaxyl (U0P393) for cultural characteristics and virulence. The results obtained are as follows.
(1) The disease development on grasses inoculated with UOP 392 in pot was protected by metalaxyl under grasshouse conditions, whereas this was not the case with UOP 393 under the same conditions.
(2) There was no significant difference between UOP 392 and UOP 393 in various cultural characteristics such as temperature, growth rate, pH and growth habit.
(3) There were some differences between the two isolates in zoospore, hyphal swellings, oogonium and oospore formation.
(4) There was no difference between the two isolates in virulence.
(5) The isolate UOP 393 retained its resistance during 2-years storage on CMA medium at 20°C.
