48th TWC, Tob. Work. Conf., 2018, abstr. 88

Effects of spray drench Quadris on Rhizoctonia Stem Rot in fields following peanut

University of Georgia, Pearson GA USA

Rhizoctonia stem rot can cause significant early season losses in tobacco. The damage is greater in a cool wet transplant season, when tobacco goes in rotation with peanuts. Trials were conducted on tobacco in 2017 to see if azoxystrobin (Quadris) reduced losses without causing plant injury. Azoxystrobin fungicide was evaluated for efficacy against Rhizoctonia solani, causal agent of tobacco rhizoctonia stem rot (damping off). The treatment was applied in the greenhouse at 0.14 oz/1000 sq ft. as a spray on rinse off tray drench in a tank mix with imidacloprid. The tobacco plants were then transplanted in the field at a later date. The weather conditions were dry in 2017, which did not allow much Rhizoctonia stem rot to occur in the field. While there was no significant benefit associated with Quadris at any one location (p=0.05) when data was combined there was a significant (p=0.05) small improvement in stand across the experiment associated with Quadris application. Our second objective was accomplished in that we did not notice any negative effects from the treatment. We will continue this research in 2018. (Reprinted with permission)