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Maize Chlorotic Mottle Virus and Crop Rotation: Effect of Sorghum on Virus Incidence. Nicki Jo Phillips, Department of Plant Pathology, Kansas State University, Manhattan 66506. J. K. Uyemoto, and D. L. Wilson, Department of Plant Pathology, Kansas State University, Manhattan 66506. Plant Dis. 66:376-379. Accepted for publication 30 June 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-376.

Subplots planted to a corn-corn sequence (1979 and 1980) contained 1.6% infection of maize chlorotic mottle virus in the surveys of 28 Juneľ2 July 1980. The virus was not detected in the sorghum-corn sequence subplots in this period. Second and third surveys on 8 and 21 July revealed maize chlorotic mottle virus incidence of 4.7% in corn-corn and 0.2% in sorghum-corn subplots. On 18 August, virus incidence was 12.2% in corn-corn and 0.6% in sorghum-corn plots. Corn yields on sorghum-corn subplots were significantly higher (P=0.05), but the increased yields could not be ascribed wholly to reduced incidence of the virus. In 1979, soil fumigation trials did not reduce maize chlorotic mottle virus infections, and yields of two corn hybrids were similar.

Keyword(s): maize dwarf mosaic viruses A and B, nematodes, wheat streak mosaic virus.