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Toxicity of Diazinon and Cypermethrin Against the American Cockroach, Periplaneta Americana (l.)

A. S. M. Shafiqur Rahman
Department of Zoology, University of Rajshahi, Rajshahi 6205, Bangladesh

M. Y. Akter
Department of Zoology, University of Rajshahi, Rajshahi 6205, Bangladesh

Abstract/ Executive Summary:

The LD₅₀ values were found to be 303.04 and 511.56 µg/insect respectively for cypermethrin and diazinon.

Keywords: Toxicity, Diazinon, Cypermethrin, American cockroach, Periplaneta americana (L.)

Location: Department of Zoology, University of Rajshahi, Rajshahi

Start Date:

End Date:

Program Area: Pest Management

Commodity: Insecticide

Objectives:

To evaluate the toxic potency of two selected insecticides, viz. diazinon and cypermethrin against P. americana under laboratory conditions.

Methodology:

Initially the adult P. americana used in the bioassays were obtained from different local flour mills under Rajshahi City Corporation. Dose mortality bioassays were undertaken according to the standard method with slight modification by topical application of a 1 μl of insecticide solution of different doses to the thoracic notum of individual adult using Hamilton microlitre syringe (Hamilton Bonaduz, Switzerland). Cockroaches were anaesthetized before dosing. Five replications of each of the five concentrations were prepared, each with 50 insects per concentration. Control insects were treated with acetone only. After treatment treated cockroaches were placed in Pyrex glass beakers containing small amount of food, and finally the insects were placed in a temperature-controlled incubator at 26° C ± 0.5° C. Dose-mortality data were corrected according to standard formula and analyzed by probit .

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 25, 2006. pp. 63-64

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The experiment indicated that the relative toxicity of the pyrethroid insecticide, cypermethrin might prove to be more economic to use.

Knowledge Management: Journal