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Quantification of Viral Disease Incidence in Corn (Zea mays) as Affected by Johnsongrass (Sorghum halepense) Control

Published online by Cambridge University Press:  12 June 2017

John W. Eberwine Jr. ,
Edward S. Hagood Jr.  and
Sue A. Tolin
John W. Eberwine Jr.
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Edward S. Hagood Jr.
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Sue A. Tolin
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
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Abstract

Field and laboratory experiments were conducted to evaluate the effect of postemergence johnsongrass control on incidence of maize chlorotic dwarf virus (MCDV) and maize dwarf mosaic virus (MDMV) in corn and to confirm the presence and movement of the blackfaced leafhopper, the insect vector of MCDV. Corn plants surrounded by MCDV- and MDMV-infected rhizomatous johnsongrass were either treated or not treated with nicosulfuron at 35 g ai/ha. Corn tissue samples were taken at the time of treatment and 4, 9, 14, and 21 d after treatment and the presence of MCDV and MDMV was determined by enzyme-linked immunosorbent assay (ELISA). Virus incidence in treated experimental units was higher at the later sampling dates relative to the nontreated. Earlier differences in incidence of MCDV and MDMV double infection in corn were detected where johnsongrass was controlled. Movement of the insect vector of MCDV was observed within the experimental area after johnsongrass was controlled, but was not significantly different from that in nontreated areas.

Keywords

Nicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamidejohnsongrass, Sorghum halepense (L.) Pers. # SORHAcorn, Zea mays L.blackfaced leafhopper, Graminella nigrifrons (Forbes)Blackfaced leafhoppermaize chlorotic dwarf virusMCDVmaize dwarf mosaic virusMDMVnicosulfuronSORHAELISA, enzyme-linked immunosorbent assayMCD, maize chlorotic dwarfMCDV, maize chlorotic dwarf virusMDM, maize dwarf mosaicMDMV, maize dwarf mosaic virusPBST, phosphate-buffered saline-Tween, PVP polyvinylpyrrolidone
Type
Research
Information
Weed Technology , Volume 12 , Issue 1 , March 1998 , pp. 121 - 127
Copyright
Copyright © 1997 by the Weed Science Society of America 

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