Field experiments were conducted at Murray, KY in 2005, 2006, and 2007 to compare dark tobacco tolerance and weed control from various herbicide systems applied prior to transplanting. Herbicide treatments included sulfentrazone at 0.38 lb ai/A (12 oz/A Spartan 4F) applied pretransplant (PT), clomazone at 1 lb ai/A PT (2.67 pt/A Command 3ME), sulfentrazone at 0.38 lb ai/A plus clomazone at 1 lb ai/A PT, pendimethalin at 1.48 lb ai/A (3.6 pt/A Prowl 3.3EC) applied pretransplant incorporated (PTI), pendimethalin at 1.48 lb ai/A PTI followed by sulfentrazone at 0.38 lb ai/A PT, pebulate at 4 lb ai/A PTI (2.67 qt/A Tillam 6-E), napropamide at 2 lb ai/A PTI (4 lb/A Devrinol 50DF), pebulate at 4 lb ai/A plus napropamide at 2 lb ai/A PTI, and a nontreated control. Visual injury to dark tobacco from any herbicide system was considered minor and did not exceed 11% at 3 weeks after application, and was not apparent by 6 weeks after application in any year. Weed species evaluated included annual grasses (primarily large crabgrass and goosegrass), yellow nutsedge, common ragweed, and entireleaf morningglory. Herbicide systems that included pendimethalin or clomazone were most effective against annual grasses evaluated, while herbicide systems that included sulfentrazone were most effective against yellow nutsedge and those that contained clomazone were most effective against common ragweed. Sulfentrazone was most effective against entireleaf morningglory, but control was improved with the addition of clomazone or pendimethalin. Total dark-fired tobacco yield where herbicides were applied ranged from 2,464 to 2,725 lb/A, although lowest total yield, quality grade index, and gross revenue was from tobacco that received pendimethalin only, most likely due to poor control of yellow nutsedge and common ragweed.
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Appreciation is extended to U.S. Smokeless Tobacco Manufacturing Co. for financial support.
Bailey, William A.; Lax, Tim; and Hill, Bobby, "Comparison of Herbicide Systems for Dark Fire-Cured Tobacco" (2014). Plant and Soil Sciences Research Report. 6.