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Effect of Johnsongrass (Sorghum halepense) Control on the Severity of Virus Diseases of Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

John W. Eberwine Jr.  and
Edward S. Hagood Jr.
John W. Eberwine Jr.
Affiliation:
Dep. Plant Pathol., Physiol., and Weed Sci., Va. Polytech. Inst. and State Univ., Blacksburg, VA 24061
Edward S. Hagood Jr.
Affiliation:
Dep. Plant Pathol., Physiol., and Weed Sci., Va. Polytech. Inst. and State Univ., Blacksburg, VA 24061
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Abstract

Field experiments were conducted to evaluate the hypothesis that johnsongrass control in corn causes increased maize dwarf mosaic virus (MDMV) and maize chlorotic dwarf virus (MCDV) disease severity because of increased movement of insect vectors from dying johnsongrass to the corn crop. Johnsongrass control treatments included 1) broadcast POST nicosulfuron, 2) directed POST imazethapyr, 3) mechanical control, and 4) no treatment. Disease severity in both a virus-susceptible and a virus-tolerant corn hybrid was evaluated. With the virus-susceptible hybrid, greater disease severity was observed where johnsongrass was controlled in the experimental area than where johnsongrass was not controlled. Increases in disease severity were independent of the method of johnsongrass control. Corollary studies conducted on the same site verified a double infection of corn with MDMV and MCDV and documented movement of blackfaced leafhoppers, the insect vector of MCDV, subsequent to treatment of johnsongrass.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidnicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamidejohnsongrass, Sorghum halepense [L.] Pers. # SORHAcorn, Zea mays L. ‘Southern States 565,’ ‘Southern States 844’blackfaced leafhopper, Graminella nigrifrons (Forbes).Maize chlorotic dwarf virusMCDVmaize dwarf mosaic virusMDMVimazethapyrnicosulfuronprimisulfuronSORHA
Type
Research
Information
Weed Technology , Volume 9 , Issue 1 , March 1995 , pp. 73 - 79
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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