MORPHOMETRICS OF FOUR GENITAL TRAITS IN SOME PHILIPPINE POPULATIONS OF THE ASIAN CORN BORER, Ostrinia furnacalis (Guenée) (Lepidoptera: Crambidae)

Gelyn D. Sapin, Barbara L. Caoili, and Jessamyn D. Recuenco-Adorada

Abstract


The morphometrics of four genital traits were examined among the 27 local populations of Asian corn borer (ACB), Ostrinia furnacalis (Guenée). Comparison in measurements of genital traits, namely: aedeagus, sacculus and valva lengths and clasper width, showed significant differences among and within the local populations compared. Cluster analysis based on percent correct classification revealed four groups within ACB populations with 96% accuracy. However, the more sensitive jackknife correct classification analysis revealed that the groups formed were 85% accurate. The results also showed that groups were formed regardless of geographical distance. The variations in genital traits of the different ACB populations can be attributed possibly to their adaptive mechanisms to their respective localities.

Key words: Asian corn borer, Ostrinia furnacalis (Guenée), genital traits, aedeagus length, sacculus length, valva length, clasper width

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