Assessment of Resistance Status of the Major Storage Insect Pests of Cocoa to Deltamethrin in Ghana: Descriptive Research

Assessment of Resistance Status of the Major Storage Insect Pests of Cocoa to Deltamethrin in Ghana: Descriptive Research

Due to the versatility of insects, many of them quickly and easily develop resistance to insecticides they have been subjected to for long periods. Should resistance strains arise in a population, its control with same and at times with similar, insecticides becomes more difficult. Possible development of resistance in the major insect pests of stored cocoa bean to deltamethrin was studied at the Entomology laboratory of the Research Department of Quality Control Company of Ghana COCOBOD at Tema. Samples of Ephestia cautella, Tribolium castaneum and Cryptolestes ferrugineus were collected from two sites with different insecticide use history and exposed to different concentrations of deltamethrin. The results showed that the response of the two populations of the insects followed a similar trend. Ephestia cautella was the most susceptible insect to deltamethrin, where 100% mortality was attained at 10 x 104 ppm concentration in both populations. Generally, the 35 x 104 ppm concentration achieved 90% mortality in the Tribolium castaneum and Cryptolestes ferrugineus populations studied. Therefore all the three storage beetles tested for resistance to deltamethrin had not developed resistance to the insecticide

Author (s) Details
Dr. W. Azalekor
Department of Quality Control Company, Ghana Cocoa Board, Box Co 247, Tema, Ghana.

Prof. J. V. K. Afun
Department of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

Prof. E. A. Osekre
Department of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

Dr. E. A. Oyewo
Department of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

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