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Toxicity of Malathion and Lambda-cyhalothrin with Piperonyl Butoxide Against the Lesser Grain Borer, Rhizopertha Dominica

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

Rezwana Ferdousi
Department of Zoology, University of Rajshahi, Rajshahi 6205, Bangladesh

Waliullah Talukdar
Institute of Biological Sciences, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

Initial bioassays were carried out to established the effects of single treatment. The LD₅₀ values of the adults R. dominica were 1.267 and 0.0767μg cm^-2 for malathion and lambda-cyhalothrin respectively. The result indicate that lambda cyhalothrin was highly toxic to the test insect as compared to malathion.

Keywords: Toxicity, malathion, lambda-cyhalothrin,, R. dominica

Location: Department of Zoology, University of Rajshahi, Rajshahi 6205, Bangladesh

Start Date:

End Date:

Program Area: Pest Management

Commodity: Insecticide

Objectives:

In the present investigation the synthetic chemicals malathion (organophosphate) and lambda-cyhalothrin (pyrethroid) either alone or in combination with a known synergist, piperonyl butoxide (PBO) was studied on R. dominica.

Methodology:

The lesser grain borer, R. dominica of the present investigation were collected from the storehouse of the flour mills of different local markets under Rajshashi City Corporation. Cultures were maintained in an incubator at 30º ± 0.5º C in jars (1L) and subcultures in beakers (500 ml) containing food medium. A standard mixture of wheat meal, corn meal and yeast (10:10:1.5) was used as the food medium in this experiment. Dose-mortality experiment was done by surface film technique. According to the results obtain from the pilot experiment five concentrations, e.g. 1:1, 1:5 and 1:10 (Insecticide : PBO) were prepared. Petridishes (90 mm) were treated with these chemicals and allowed to dry out through evaporation of the solvent. Adults of five days old were released to each of the treated petridish and the same experiment was repeated five times. The mortality data was recorded after 24 h of exposure. Mortality was corrected by using Abbott’s formula. The observed data was subjected to probit analysis.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 103-105; ISSN 1023-6104

Article Link (Online Journal): http://journals.sfu.ca/bd/index.php/UJZRU

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The result indicated that PBO has some synergistic effect with both insecticides on R. dominica.

Knowledge Management: Journal