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This article in CS

  1. Vol. 28 No. 4, p. 691-694
     
    Received: July 6, 1987
    Published: July, 1988


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doi:10.2135/cropsci1988.0011183X002800040028x

Yield Losses Caused by Maize Dwarf Mosaic Virus in Maize

  1. G. E. Scott ,
  2. L. L. Darrah,
  3. J. R. Wallin,
  4. D. R. West,
  5. J. K. Knoke,
  6. R. Louie,
  7. R. T. Gudauskas,
  8. A. J. Bockholt,
  9. V. D. Damsteegt and
  10. J. K. Uyemoto
  1. U SDA-ARS, Crop Sci. Res. Lab., Mississippi State Univ., Mississippi State, MS 39762
    D ep. of Plant and Soil Sci., Univ. of Tennessee, Knoxville, TN 37901
    D ep. of Plant Path., Auburn Univ., Auburn, AL 36849
    D ep. of Soil Sci., Texas A&M Univ., College Station, TX 77843
    U SDA-ARS, Plant Disease Res. Lab., Frederick, MD 21701
    D ep. of Plant Path., Kansas State Univ., Manhattan, KS 66506

Abstract

Abstract

Maize dwarf mosaic (MDM) is a virus disease of maize (Zea mays L.) that causes yield reductions. The objective of this study was to determine yield losses caused by maized warm fosaic virus strain A (MDMV-A) in susceptible maize hybrids grown over a wide range of environmental conditions. Plants inoculated with MDMV-A were compared with noninoculated plants in the years 1981 to 1984 at various locations within the USA. Inoculation levels were 100% in 1981; 33, 67, and 100% in 1982; and 50 and 100% of the plants in 1983 and 1984. The regressions of grain yields (expressed as a percentage of the noninoculated check) on MDM-diseased plants were calculated. Linear regressions best explained the results, and deviations from linearity were not statistically significant. The b values ranged from 0.118 to 0.445 for different location and year combinations. The linear regression that best described the results over all environments and hybrids was Y = 99.7 − 0.242x where Y = predicted yield (as a percentage of the noninoculated check) and x = percentage of diseased plants. Thus, maized warm fosaic virus decreased yields by an average of 2.4% for each 10% increase in MDM-diseased plants. This certainly emphasizes the need to grow hybrids that are resistant to this virus.

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