Biology of two local populations and evaluation on the growth and feeding behavior of the striped stemborer, Chilo suppresalis (Walker) (Lepidoptera : Pyralidae) on Bacillus thuringiensis CRY IIA delta- endotoxin

Date

4-1993

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

The biology, growth and feeding behavior of Chilo suppressalis was studied based on the response toBacillus thuringiensis Cry IIA delta-endotoxin. Larval development time of the 2 populations and their hybrids showed no significant differences between the interaction of population and sex indicating that sex is not a major factor during the development of the larvae in the population to observe any differences. Pupal and total development time, however, showed significant differences between the interaction of population with sex indicating that sex is a major factor in the development of the insect to observe their differences among populations. Goodness-of-fit test showed the populations deviate from the 1:1 sex ratio and that it can be genetically inherited through hybridization. Toxicity tests showed the effects of B.t. Cry IIA delta-endotoxin on C. suppressalis. Results showed that the toxin had no "knockdown" effect on the insect but had an effect on its growth and development. Behavior of insect with the toxin showed evidence. There were reduction of weightd observed. a mechanism for the "non-effectiveness" of the toxin was proposed. Its implication on past management was also proposed.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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