Tolerance of peppermint to tiafenacil applied postharvest

Abstract Trials were conducted in two experimental runs at the Purdue University Horticulture Greenhouses, West Lafayette, IN, to determine ‘Redefined Murray Mitcham’ peppermint tolerance tiafenacil. Established 20-cm-diameter polyethylene pots was subjected a simulated harvest by removing aboveground biomass substrate surface; then, tiafenacil applied 0, 25, 50, 100, and 200 g ai ha −1 . Visible crop injury, height, dry data regression analysis generate predictive models. At 2 wk after treatment (WAT), injury increased from 63% 86% 25% 76% Experimental Run 1 2, respectively, as rate 25 4 WAT, 0% 4% 37% By 7 WAT (both runs), 17% height decreased 23.0 8.6 cm 17.6 10.3 0 28.1 21.4 Aboveground weight of nontreated check 20.3 pot 19.3 7.0 Despite acute necrosis, lower rates not persistent. The proposed 1X for peppermint, , resulted ≤4% only 3% reduction plant 4.7% compared check.