Sensitivity of sweet corn (Zea mays L.) and potatoes (Solanum tuberosum L.) to cloransulam-methyl soil residues

Field experiments were conducted in 1999 and 2000 at three sites in Midwestern USA to characterize the sensitivity of sweet corn and potatoes to cloransulam-methyl soil residues the year following application to soybeans. Cloransulam-methyl was applied pre-emergence to soybeans in 1999 at 0, 1 X, 2X, and 4X the recommended rate. In 2000, there was a cultivar-by-herbicide interaction for sweet corn injury at some but not all sites. Generally, the sweet corn injury was apparent at 7 days after emergence (DAE) and peaked at 28 DAE. Sweet corn and potato injury was more severe at sites With coarse soil texture and low soil organic matter. There was evidence of differential tolerance by different potato varieties. Results suggest that cloransulam-methyl residue the year after application to soybean is high enough to injure most sweet corn and potato cultivars. (C) 2002 Elsevier Science Ltd. All rights reserved.