Environmental Influences on Resistance to Sitotroga cerealella1 in Varieties of Rough Rice 2

Authors:
  • RCRobert R. Cogburn
    Robert R. Cogburn
  • CBC. N. Bollich
    C. N. Bollich
  • TJT. H. Johnston
    T. H. Johnston
  • WMW. O. Mcilrath
    W. O. Mcilrath
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Abstract
Varieties of rice that had shown promise for resistance to the Angoumois grain moth, Sitotroga cerealella (Olivier), were grown at 3 locations in the southern rice belt of the U.S. to determine whether differing environments during production would affect infestability in storage. Significant differences in infestability were found among the varieties grown at each location and when data were combined to cover all locations, significant differences persisted. The locations were significantly different from each other and there were strong interactions between varieties and locations. Variety CI 12273 was the most resistant at each location and, thus, appears to have genetic resistance but the resistance base(s) was not identified. Commercial varieties from the U.S. were relatively susceptible; Far East varieties from the USDA World Collection that were selected for resistance tended to remain resistant. Another group of varieties grown at a single location but under 2 levels of N fertilization was checked for infestability. Correlations of infestability with several agronomic and physicochemical characteristics were statistically significant but none was strong enough to suggest a specific dependency.