Response of some main coleopteran grain pests to biinsecticide residue

Resumo

The results of experimental investigations of adult mortality of six harmful beetle species on wheat grain treated with emulsifiable concentrate of biinsecticide containing 400 g/L of pirimiphos-methyl and 10 g/L of bifenthrin are described. The period of complete protection of grain from infestation with Laemophloeus ferrugineus Steph., Rhizopertha dominica F., Sitophilus oryzae L., Oryzaephilus surinamensis L., Sitophilus granarius L., and Tribolium confusum Duv. at a dosage of 2 mL/t was 12, 4, 1, 1, 1, and 0 months, respectively; at 3 mL/t, 12, 9, 4, 2, 2, and 1 months; at 4 mL/t, 12, 9, 8, 7, 2 and 1 months; at 6 mL/t, 12, 12, 12, 12, 8, and 1 months; and at 8 mL/t, 12, 12, 12, 12, 12, and 3 months.