Relationship Between Some Characteristics of the Corn Kernel Pericarp and Resistance to the Rice Weevil (Coleoptera: Curculionidae)1

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Abstract
Two resistant, two intermediate, and two susceptible corn genotypes were used to investigate relationships between physical characteristics of the pericarp and resistance against Sitophilus oryzae (L.). A significantly larger number of eggs were found in kernels without pericarp than in undamaged kernels. No correlation could be found between number of eggs laid and thickness of the pericarp measured in the kernel tip. A paraffin coat applied on the kernel tip, the zone most preferred for oviposition, apparently did not greatly influence the number or location of eggs laid. Pericarp topography did not seem to be associated with resistance. The ovipositional behavior of the females in the treatments used in these experiments may be explained by the presence of an ovipositional stimulant in the corn kernels.

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