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Response of Sulfonylurea-Tolerant Soybean (Glycine max) and Selected Weed Species to Imazethapyr and Thifensulfuron Combinations

Published online by Cambridge University Press:  12 June 2017

D. M. Simpson  and
E. W. Stoller
D. M. Simpson
Affiliation:
Dep. Agron., Univ. Illinois, Univ. of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
E. W. Stoller
Affiliation:
USDA-ARS, Agronomy Dep., Univ. of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
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Abstract

Sulfonylurea-tolerant soybean (STS soybean) tolerance to imazethapyr (70 g/ha) plus thifensulfuron (4.4 g/ha) tank mixture was evaluated in 1993 and 1994 at two locations in Illinois. Thifensulfuron injury was reduced from 27% in non-STS soybean to 1% in STS soybean 14 days after treatment (DAT). STS and non-STS soybean did not differ in response to imazethapyr alone with < 6% injury 14 DAT. Injury from the tank mix was reduced from 40% in non-STS soybean to 24% in STS soybean 14 DAT. However, a synergistic interaction between the herbicides exists in STS soybean. The yield of injured soybean was not reduced in either STS or non-STS soybean. Injury to STS soybean from the tank mix was decreased by reducing the rate of imazethapyr from 70 g/ha to 52.5 or 35 g/ha. Reducing the thifensulfuron rate mixed with imazethapyr at 70 g/ha did not decrease injury in STS soybean. Control of smooth pigweed, common lambsquarters, and common cocklebur was not affected by reducing the rate of either herbicide in the tank mixture.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidthifensulfuron, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino] sulfonyl]-2-thiophenecarboxylic acidcommon cocklebur, Xanthium strumarium L. # XANSTcommon lambsquarters, Chenopodium album L. # CHEALsmooth pigweed, Amaranthus hybridus L. # AMACHsoybean, Glycine max (L.) Merr.Interactionssynergismtank mixturesSTS soybean
Type
Research
Information
Weed Technology , Volume 9 , Issue 3 , September 1995 , pp. 582 - 586
Copyright
Copyright © 1995 by the Weed Science Society of America 

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