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Maize Dwarf Mosaic Virus Severity in Corn When Infected Johnsongrass is Controlled with a Postemergence Herbicide

Published online by Cambridge University Press:  12 June 2017

Mark J. Vangessel  and
Harold D. Coble
Mark J. Vangessel
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695-7620
Harold D. Coble
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695-7620
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Abstract

The impact of either nicosulfuron or primisulfuron on maize dwarf mosaic virus (MDMV-A) severity in corn and corn susceptibility to MDMV-A infection were evaluated in greenhouse and laboratory studies. Neither herbicide influenced severity of MDMV-A in corn or corn susceptibility to the virus. Field experiments at five sites examined MDMV-A severity in corn as influenced by POST johnsongrass control with either nicosulfuron or primisulfuron applied at the fifth or eighth visible collar stage, no johnsongrass control, or johnsongrass control throughout the season with hoeing. Area under the cumulative virus curve (AUCVC) was reduced when either herbicide was applied at the fifth-leaf stage compared to the eighth-leaf stage, at four sites. Also, AUCVC was reduced when johnsongrass was controlled with a POST herbicide applied at the fifth or eighth collar stage compared to no control, at two sites. Increases in AUCVC were due to a greater number of infected plants rather than more severe MDMV-A infections.

Keywords

Nicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)-amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamideprimisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]-amino]carbonyl]-amino]-sulfonyl]benzoic acid methyl estercorn, Zea mays L.johnsongrass, Sorghum halepense (L.) Pers. # SORHAArea under cumulative virus curveAUCVCarea under disease progress curveAUDPCenzyme-linked immunosorbent assayELISAmaize dwarf mosaic virusMDMV
Type
Soil, Air, and Water
Information
Weed Science , Volume 41 , Issue 2 , June 1993 , pp. 262 - 268
Copyright
Copyright © 1993 by the Weed Science Society of America 

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