Varietal Resistance of Rice to the Asiatic Rice Borer, Chilo suppressalis (Lepidoptera: Crambidae), and Its Association with Various Plant Characters1

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Abstract
Infestation by the Asiatic rice borer, Chilo suppressalis (Walker), varied significantly and consistently among the 33 rice varieties of diversified germ plasm that were studied. Highly significant positive correlations were recorded between percentages of infested tillers and height of the culm, external and internal diameters of the stem, number of elongated internodes, and width and length of flag-leaf blades; correlations were negative between such percentages and number of tillers per plant and the cross-sectional culm area occupied by the vascular bundle sheaths toward the periphery of the stem. The results indicate that differences in borer infestation were caused by a combination of factors, and that no single factor was responsible for plant resistance. In general, the rice varieties less susceptible to rice borer infestation were those with hairy upper lamina, tight leaf-sheath wrapping, small stem with a ridged surface, and thicker hypodermal layers.

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