An aspect of resistance management in Tribolium castaneum (Coleoptera : Tenebrionidae)‎ against some insecticides

Abstract EN

Most of the stored product insects acquire resistance against many chemical pesticides used in control of these important insects Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) beetle.

Some laboratory experiments were conducted to determine the common resistance and resistance of the insect mentioned against four insecticides that belong to two groups: the organophosphorus (OP) pesticides including malathion, chlorpyriphos and pirimiphos-methyl and carbamate pesticides including methomyl using the thin film residue.

The study also included the use of anise volatile plant oil as stimulant of the studied insecticides.

The results obtained indicated that pirimiphos- methyl was the most toxic insecticide and about 5.9, 8 and 84 times as toxic as methomyl, chloropyrifos and malathion, respectively.

Results also revealed that increasing the period of exposure from 24 to 48 hours resulted in an increase the mortality of beetles.

Furthermore, selection pressure on susceptible T.

cstaneum adults from chlorpyrifos induced moderate tolerance and selection with malathion and primiphos- methyl showed moderate resistant (< 40- fold), whereas pressure from methomyl achieved high resistant (>40- fold).

The resistant strains have very little or no cross-resistance to the pyerthroids insecticides, permethrin and only less than two-fold crossresistance to the OP insecticide chlorpyrifos.

The level of cross-resistance in resistant strains varies with a compound.

For synergism studies results refers to greater synergism of all insecticides was achieved in the resistant strains.

Also results indicated that there was net gain towards synergism in the resistant strains compared to that of susceptible strains.

The findings obtained include the possibility of using anise oil to synergies the action of tested insecticides to reduce, delay and prevent resistance in the flour beetle against pesticides understudy.