Assesing variability in the Asiatic corn borer Ostrinia furnacalis (Guenee) (Lepidoptera : Pyralidae).

Date

4-1994

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Cesar G. Demayo

Abstract

ariability in local populations of the Asiatic corn borer Ostrinla furnacalis Guenee was assessed based on: I) some life history parameters; 2) survival, and 3) feeding behavior and growth on diet with different concentrations of the Bacillus ihuringiensis delta-endotoxin, Cry IA(c). Significant differences in larval development time, pupal development time and hatching-to-emergence time were observed within and among the four populations of 0. filmacalis that were studied. Deviation from the expected 1:1 sex ratio was also observed in all populations. When fed with artificial diet containing Cry IA(c), neonates, day-old larvae and 4-5 day old larvae showed very high mortality at all concentrations of the toxin. Low mortality was observed in 6-7 day old larvae and 3rd instars. When given a choice between normal diet and Cry IA(c)-treated diet, neonates, day-old larvae and 3rd instars exhibited avoidance toward the toxin-containing diet and preferred the unadulterated diet. Significant weight loss was observed in 3rd instars that were fed Cry IA(c)- treated diet.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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