Assesment of variability in a local population of the striped stemborer Chilo suppressalis (Walker) and evaluation on its response to different Bacillus thuringiensis strain formulations

Date

3-1992

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Cesar G. Demayo

Abstract

ASSESSMENT OF VARIABILITY IN A LOCAL POPULATION OF THE STRIPED STEMBORER Chilo suppressalis (Walker) AND EVALUATION ON ITS RESPONSE TO DIFFERENT Bacillus thuringiensis STRAIN FORMULATIONS.

Adviser: Dr. Cesar G. Demayo

The biology, behavior, growth and development of Chile suppressalis was determined with respect to its response to Bacillus thuringiensis strain formulations. Larval development time showed significant difference between males and females, suggesting sex to be a factor in the development of larvae. Pupal development time for both sexes were equal, while total developmental period indicates sex as a factor for the development of neonates to emergence of adults. Goodness-of-fit test showed a population not having a I:I ratio and hybridization tests indicated that the deviation from the expected ratio is genetically controlled. Percentage mean mortality on neonates was found to be highest in Dipel as compared to 1715 and HD73. Behavioral studies on third instar larvae using B.t.-formulated diets showed avoidance in diets containing the toxins. Reduction in weights of larvae feeding on formulated diets with B.t. was observed. Third instar larvae forced fed with Dipel and 1715 showed high esterase activity, while HD73 showed significantly low esterase activity.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

This document is currently not available here.

Share

COinS