The suppressive effect of application conditions of <i>Coniothyrium minitans</i> to control <i>Sclerotinia sclerotiorum </i>

Abstract

SummaryVarious 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.

Field method to monitor the mycoparasitic fungus Coniothyrium minitans

“…The disease protective value for each treatment (125-fold/100 L and 250-fold/200 L) was 61.1 and 92.4, respectively (Table S1). This trend was also observed in the previous year's disease protection test, i.e., disease protective value for each treatment (125-fold/ 100 L and 250-fold/200 L) was 37 and 59, respectively (Iwamoto et al 2015).…”

“…S2. Disease severity of sclerotinia disease by Sclerotinia sclerotiorum in the lettuce in December (Iwamoto et al 2015) was scored according to the following scale: 0, no disease; 1, patchy lesions on the bulb (lesions at the top were discarded because they were due to infection from airborne ascospores); 2, necrosis on a few leaves; or 3, necrosis on the whole plant. Disease protective value was calculated by the following equation: disease protective value = [1 -disease incidence (%) for BCA treatment/disease incidence (%) for control] 9 100.…”