Abstract
Various treatment conditions were examined to ascertain an effective utilization method of Coniothyrium minitans. Results were confirmed that a sufficient control effect was achieved at a half dose rate of the currently actual dosage. Considering a treatment timing, a better control effect was obtained by spraying at the time of plowing in residues from the prior crop than by treatment before planting. Moreover, a stable efficacy was obtained by increasing the spray volume applied per unit area to avoid uneven spraying. The results presented above suggest that a stable effect is obtainable by further study of application technique.
