Comparative Sensitivity ofRhizoctonia solaniand Rhizoctonia-like Fungi to Selected Fungicides In Vitro

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Abstract
Benomyl, carboxin, PCNB [pentachloronitrobenzene], iprodione, chlorothalonil, and triadimefon were added to potato-dextrose agar at 0, 1, 10 and 100 mg a.i.[active ingredient]/l. The in vitro growth response (inhibition of linear growth) of 16 isolates of R. solani, binucleate Rhizoctonia-like fungi, and R. zeae from several sources were tested on fungicide-amended media. R. solani and binucleate Rhizoctonia-like fungi were sensitive to benomyl (EC50 [effective concentration for 50% inhibition of linear growth] < 10 mg a.i./l, whereas isolates of R. zeae were tolerant to benomyl (EC50 > 50 mg a.i./l) but sensitive to the other fungicides. Fungi were most sensitive to iprodione (EC50 generally < 1 mg a.i./l), but growth inhibition in response to other fungicides (especially PCNB) differed considerably. Anastomosis group tester isolates of R. solani were variable in response to carboxin, PCNB, chlorothalonil and triadimefon.

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