مرکز منطقه ای اطلاع رساني علوم و فناوري - DETERMINATION OF RESISTANCE RATIOS OF THE COTTON BOLLWORM (Helicoverpa armigera (Hübner)) AGAINST INSECTICIDES IN ADANA

Abstract :

Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) is the major pest of cotton. Adana is one of the important cities of Turkey for cotton production. H. armigera causes important cotton production losses by damaging its generative organs, and chemical insecticides have been commonly used to reduce these losses. Intensive amount of profenofos, pyridalyl, spinosad, thiodicarb and zeta-cypermethrin have been applied to cotton farming areas for controlling H. armigera in Turkey. Resistance development of H. armigera to applied insecticides has been observed as a result of excess amount of insecticide applications in cotton growing areas. The aim of this study is to determine the resistance ratios of Adana field population of H. armigera to five different types of insecticides, with different mechanism of action, registered on cotton in Turkey, in 2008. Third instar larvae of H. armigera samples were used in the experiments. In the present study, it was determined that resistance ratios for 5 different insecticides; 1.33 fold (profenofos), 4.8 fold (pyridalyl), 3.8 fold (spinosad), 5 fold (thiodicarb) and 21 fold (zeta-cypermethrin) by using topical application bioassay method. H. armigera Adana field population showed the highest resistance level to zeta-cypermethrin (moderate resistance level) among the insecticides tested. In addition, while H. armigera showed low level of resistance to pyridalyl, spinosad and thiodicarb, it did not develop resistance to prefenofos.