Cytogenetics of carbaryl- resistant and susceptible red spider mite, Tetranychus kanzawai kishida (Acarina : Tetranychidae)

Date

5-1981

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

ABSTRACT CHRISTINE C. FRANCIA, University of the Philippines at Los Banos, May, 1981. Cytogenetics of Carbaryl-Pesistant and Susceptible Red Spider mites, Tetran chus kanzawai Kishida (Acarina, Tetranychidae). Adviser! Mrs. Adelina A. Barrion. The study determined the cytogenetics of both carbaryl susceptible and resistant populations of Tetranychus kanzawai Kishida. It presentelobservations, descriptions, illustrations and comparisons of chromosome arrangements and behavior during first meiotic stages. The red spider mites were mass-reared on mungbean (Vigna radiata) (CES 2C. 1). The resistant populations were developed by exposure sprayings with recommended rate of carbaryl once a week for one year. Embryonic cells from haploid male eggs were examined cytologically using the aceto orcein technique with one per-cent sodium citrate pre-treatment. This revealed the male egg cells to have haploid chromosome number n=4. First meiotic cells from embryonic tissues of carbaryl susceptible T, kanzawai had a mean length of 9.04 Prometa-phase chromosomes had mean lengths of 0,9,u, and 0.8u for chromosomes 1 and 2 and 0.5u for both chromosomes 3 and 4. Chromosomes 1 and 2 are bean shaped, hence, arc submetacentric• while chromosomes 3 and 4 are rod-shaped. hence, arc telocentric.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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