Factors that Affect the Relative Resistance of Rough Rice to Angoumois Grain Moths and Lesser Grain Borers1

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Abstract
Susceptible commercial varieties of rice were compared with resistant World Collection varieties by using Angoumois grain moths, Sitotroga cerealella (Olivier), and lesser grain borers, Rhyzopertha dominica (F.). Imperfect hulls favored infestation by the moth, but planting date did not. Wild and domesticated strains of moths varied in fecundity, but the relative resistance of varieties was unaffected. Varieties resistant to the moth were also less susceptible to the lesser grain borer (r = 0.96). Morphological differences in the central vascular bundle in the abscission scar affect the ability of the moth to penetrate grains that have intact hulls. Moth larvae penetrated through the vascular bundle of Vista (S) but not CI 12273 (R).