J. Bio. Env. Sci.4(6), 370-380, June 2014
The antifungal efficacy of six botanical extracts viz., Cannabis sativa L., Peganum harmala L., Datura starmonium L., Artemisia brevifolium L., Capparis spinosa L., Mentha royleana L. and two bioagents viz., Trichoderma harizanum and Trichoderma viride were evaluated in vitro against sclerotial isolates of Rhizoctonia solani causing black scurf of potato through food poison and dual culture technique, respectively. The data revealed that increasing concentration form 5 to 15% of botanical extract suppressed the mycelial growth of all isolates. A highest antifungal property was found in C. sativa which was followed by P.harmala and D. starmonium while least in Capparis spinosa. Mycelial inhibition range in the concentrations of 5-15% were recorded in C. sativa (36.43-80.00%) P.harmala (26.71-69.20%), D. starmonium (26.44-70.28 %), A.brevifolium (24.04-66.67%) C. spinosa (21.70-50.16%) and M. royleana (24.14-61.94). Highest sensitivity against botanical extracts was observed in isolates RS10, RS4 and RS5 while least in RS12 and RS16 at concentration of 5, 10 and 15% respectively. Among the tested bioagents mycelial growth inhibition of R. solani isolates was recorded in case of T.harzianum (48.32-72.72%) and T.viride (28.75-56.80%). T. harzanium caused highest mycelial inhibition in isolate RS10 and least effective in isolate RS4 whereas T.viride was most effective in isolates RS3 and least in isolate RS15.
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