Macrophomina phaseolina from cowpea develosed resistance to higher concentration of quintozene when serially transferred from media containing quintezone from lower to higher concentrations. On the contrary it did not show any resistance to TMTD. The in- hibition by quintozene at 2000 ppm was 83.88. and 85,52 per cent when M. phaseolina was transferred from lower concentrations of 250, 500 and 1000 ppm respectively as against 91.13 per cent when transferred from control plates.
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