Behavioral response of the green leafhopper Nephotettix virescens Distant (Homoptera : Cicadellidae) on different rice lines and Bacillus thuringiensis CryIA(c) Delta-Endotoxin

Date

10-1995

Degree

Bachelor of Science in Biology

Major Course

Major in Ecology Genetics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Cesar G. Demayo

Abstract

Within-population variability in the green leafhopper (GUI) Nephotettix virescens Distant was investigated in terms of ability to damage rice with different levels of GLH-resistance and choice and no choice responses to CryLA(c) delta-endotoxin. Using a numerical scale to describe the degree and pattern of yellowing of individual seedlings in rows of rice being screened for GLH-resistance, differences in damage were observed in rice lines rated resistant, moderately resistant, and susceptible through the Standard Evaluation System (SF,S) scale, as well as in rows of the resistant IR29 and susceptible check. A series of choice tests using honey and water solutions of CryIA(c) and no choice tests using different concentrations of CryIA(c) revealed a wide range of variability in preference and survival. The behavioral variability within the population poses a threat to the stability of GLH-resistance in rice and necessitates the inclusion of non-target but significant pests like N virescens in evaluation tests being conducted with the Bt-engineered rice.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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