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Johnsongrass Control with DPX-V9360 and CGA-136872 in Corn (Zea mays) in Virginia

Published online by Cambridge University Press:  12 June 2017

Chester L. Foy  and
Harold L. Witt
Chester L. Foy
Affiliation:
Dep. Plant Pathol., Physiol., Weed Sci., Va Polytech. Inst. State Univ., Blacksburg, VA 24061
Harold L. Witt
Affiliation:
Dep. Plant Pathol., Physiol., Weed Sci., Va Polytech. Inst. State Univ., Blacksburg, VA 24061
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Abstract

Five field experiments were conducted at two locations in Virginia during 1988–89 to evaluate DPX-V9360 and CGA-136872 for postemergence control of johnsongrass in field corn grown under no-till and conventional conditions. DPX-V9360 at rates of 35 (except in no-till plots), 52, and 69 g ai ha-1 applied to 8-leaf johnsongrass was 88 to 98% effective in 1988. CGA-136872 at 25, 49, and 99 g ha-1 was 80% effective at the highest rate. Applications of these herbicides to 6-leaf johnsongrass resulted in 69% or less control. DPX-V9360 at 35, 52, and 69 g ha-1 and CGA-136872 at 20 and 40 g ha-1 applied to johnsongrass up to 48 cm in height provided 77 to 97% control at 7 WAT3 in an excellent stand of conventionally planted corn during 1989. Crop yields were more than doubled with herbicide treatments relative to yields in control plots. At a second location where crop damage caused by other factors resulted in a weak stand, DPX-V9360 provided 61 to 96% control compared to 29 to 56% control with CGA-136872.

Keywords

CGA-136872, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl] benzoic acid methyl esterDPX-V9360, 3-pyridinecarboxamide, 2-(((4,6-dimethoxy-pyrimidin-2-yl)aminocarbonyl))aminosulfonyl)))-N,N-dimethylcorn, Zea mays L.johnsongrass, Sorghum halepense (L.) Pers. ♯4 SORHAAdjuvantno-tillconventional tillageSORHA
Type
Research
Information
Weed Technology , Volume 4 , Issue 3 , September 1990 , pp. 615 - 619
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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