Resistance to Lindane, Malathion and Fenitrothion in Coleopterous Pests of Stored Products in New Caledonia

Abstract

Field strains of Tribolium castaneum, Rhyzopertha dominica, Oryzaephilus surinamensis, Sitophilus oryzae and S. zeamais were studied for their response to lindane, malathion and fenitrothion. Bioassay tests were conducted using the insecticide-impregnated filter paper method according to the standard technique recommended by F.A.O. The synergist triphenyl phospate was used to check for malathion specific resistance. Several strains of T. castaneum were resistant to lindane and malathion, with specific malathion resistance, R. dominica were susceptible to lindane but resistant to malathion and fenitrothion, O. surina mensis were diagnosed resistant to the three compounds tested. The last two species were non-malathion specific resistant. All Sitophilus spp. strains tested were susceptible to lindane, malathion and fenitrothion.