Effect of simulated synthetic auxin herbicide sprayer contamination in sweetpotato propagation beds

Abstract Field studies were conducted to determine the effects of synthetic auxin herbicides at simulated exposure rates applied ‘Covington’ sweetpotato propagation beds on quality nonrooted stem cuttings (slips). Treatments included diglycolamine salt dicamba, 2,4-D choline plus nonionic surfactant (NIS), and glyphosate 1/10, 1/33, or 1/66 a 1X application rate (560 g ae ha −1 1,065 choline, 1,130 glyphosate) 2 4 wk after first slip harvest (WASH). Injury treatment was greatest when WASH (21%) compared (16%). More injury caused by than addition did not increase over alone. Two weeks second application, slips cut cm above soil surface transplanted into production fields. In 2019, ground coverage 8 transplanting reduced 37% 26% 1/10X dicamba NIS, respectively. Though less with without glyphosate, transplanting, treated recover as quickly those choline. 2020, 90% greater for all treatments. Dicamba decreased marketable storage root yield 59% nontreated check, whereas treatments including 22% 29%. All 31% 36%. The yield. Results indicate that caution should be taken deciding whether transplant are suspected have been exposed