Conditions Modifying Expression of Resistance of Maize Kernels to the Maize Weevil 1

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Abstract
Conditions modifying expression of resistance of maize kernels to the maize weevil, Sitophilus zeamaiz Motschulsky, were investigated in the laboratory. Sample size, moisture equilibration, and kernel aging did not modify resistance, whereas germination increased susceptibility. Earlier findings that resistance is mainly located in the undamaged pericarp were confirmed. More progeny developed on susceptible than on resistant lines after pericarp was damaged. Adding flour or dough to kernels significantly increased progeny numbers. A brief extraction of kernels in ethyl ether also increased progeny numbers significantly. The data suggested that resistance was due to nonpreference and was based on lack of feeding stimulants in resistant kernels, the undamaged pericarp acting primarily as a barrier against feeding and subsequent oviposition.

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