Genetic Plasticity of Stored-Product Insects in Relation to Insecticides: Comparative Susceptibility of Confused and Red Flour Beetles from Various Areas of California to Malathion1,2

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The toxicity of malathion to 8 strains of confused flour beetles, Tribolium confusum Jacqulin duVal, and to 39 strains of red flour beetles, T. castaneum (Herbst), collected from widely separated locations in California was compared with results from direct spray experiments with standard laboratory cultures of the same species. On the basis of 1 being assigned to LC values obtained from tests with standard laboratory cultures, the susceptibility ratio of field strains of confused flour beetles ranged from 0.84 to 1.19 at LC50and from 0.76 to 1.37 at LC95. The susceptibility ratio of field strains of red flour beetles ranged from 0.78 to 1.33 at LC50 and from 0.75 to 2.22 at LC95. Differences in susceptibility to malathion of field strains of flour beetles from various areas of California was attributed to normal genetic plasticity of the species. Resistance to malathion in the natural sample populations obtained to provide culture stock of field strains was not indicated by the results of this study.

Document Type: Research Article

Publication date: April 1, 1969

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