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In the years 2010–2012 were tested resistance of the granary weevil (Sitophilus granarius L.) and the confused flour beetle (Tribolium confusum Duv.) to active substance of insecticides used in Poland. The insects were collected from warehouses located throughout whole the country. The granary weevil was collected from 21 locations and the confused flour beetle from 11 locations. Tests of resistance to contact insecticides deltamethrin and pirimiphos-methyl were carried out according with IRAC (Insecticide Resistance Action Committee) Susceptibility Test Method No. 6. Phosphine resistance test was performed according with method of Detia Degesch in special testers “Phosphine Resistance Test Kit”. Two cases of resistance to deltamethrin of some individuals of granary weevil were found. No cases of wholly resistance of the studied populations of pests to pirimiphos-methyl or for phosphine were reported. Most of tested populations of the granary weevil and the confused flour beetle demonstrated a reduced susceptibility to deltamethrin and pirimiphos-methyl. Only a few individuals of the granary weevil demonstrated a reduced susceptibility to phosphine.

Resistance of stored grain insect pests to active substances used in Poland for protection of stored grains