Abstract
In vitro and in vivo effectiveness of fungicides were evaluated for the control of damping off caused by Rhizoctonia solani on Panax ginseng. Fludioxonil(67 mg a. i./L), flutolanil(75 mg a. i./L), thifluzamide(35 mg a. i./L), and mepronil (750 mg a. i./L) were selected from 9 fungicides, which were based on inhibition of mycelial growth of R. solani (isolate Rh 9801) and duration of fungicidal effectiveness against the pathogen in vitro. Field trials were made twice in the year of 2003 and 2004. Experimental plots <TEX>$(54m{\times}0.9m)$</TEX> of 4-year-old ginseng fields were artificially infested with 5kg and 14 kg in fresh weight of inoculum in 2003 and 2004, respectively. The fungicides were drenched at a volume of 8l in <TEX>$3.6m{\times}0.9m$</TEX> with 3 replications. Fludioxonil, flutolanil, thifluzamide and mepronil reduced the incidence of damping off by <TEX>$73\%,\;69\%,\;69\%\;and\;43\%$</TEX>, respectively. In the 2004 trial, fludioxonil, flutolanil, and thifluzamide showed similar result as reducing the incidence by <TEX>$85\%,\;84\%,\;and\;82\%$</TEX>, respectively, in the plot where the inoculum was applied 2.8 times more than the 2003. The disease incidences in untreated control were <TEX>$12\%$</TEX> in 2003 and <TEX>$47\%$</TEX> in 2004.
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