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Johnsongrass (Sorghum halepense) and Pitted Morningglory (Ipomoea lacunosa) Control with Imazaquin and Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Dennis G. Riley  and
David R. Shaw
Dennis G. Riley
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

Imazaquin and imazethapyr were applied postemergence to soybeans for control of 8- to 12-leaf rhizome johnsongrass and pitted morningglory in the field. At 8 weeks, johnsongrass control was 70% with 70 g ai/ha imazaquin plus 105 g ai/ha imazethapyr but was no more than 50% with a single application of either herbicide. Imazaquin at 70 g/ha plus imazethapyr at 35 g/ha interacted synergistically to provide 90% pitted morningglory control, while 140 g/ha imazaquin controlled 77%. Imazaquin at 70 g/ha with imazethapyr from 18 to 105 g/ha controlled both weed species equal to or better than that obtained with 140 g/ha imazaquin.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidjohnsongrass, Sorghum halepense (L.)Pers. #3 SORHApitted morningglory, Ipomoea lacunosa L. # IPOLAsoybean, Glycine max (L.)Merr.SynergismantagonismimidazolinoneSORHAIPOLA
Type
Research
Information
Weed Technology , Volume 3 , Issue 1 , March 1989 , pp. 95 - 98
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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