Özet:

Cotton is one of the important industrial plants in Turkey and Helicoverpa armigera (cotton bollworm)(Hübner) (Lepidoptera: Noctuidae) is one of the most important pests of cotton in Turkey. This pest causes significant loss of production by damaging especially generative organs on cotton. Commonly, chemical control method was used against this pest. Furthermore, high quantity of insecticides was also used to control it in our country.  Therefore, resistance problems were seen in H. armigera against used insecticides in some years. The purpose of this study is to determine the baseline toxicity (Lethal Dose (LD50)) values in susceptible populations of H. armigera for registered active substances on cotton in Turkey. Third instar larvae of H. Armigera from susceptible populations were used in the experiments. In this study, we were determined the LD50 values for 12 active substances; azinphos-methyl (0.152 μg/larva), bifentrin (0.004 μg/larva), beta-cyfluthrin (0.001 μg/larva), esfenvalerate (0.003 μg/larva), thiodicarb (0.116 μg/larva), indoxacarb (0.043 μg/larva), lambda-cyhalothrin (0.002 μg/larva), methomyl (0.201 μg/larva), profenophos (0.096 μg/larva), pyridalyl (0.011 μg/larva), spinosad (0.015 μg/larva) and zeta-cypermethyl (0.03 μg/larva) using bioass methods. The determined LD50 values in susceptible population of H. armigera will be used to detect resistance ratio of H. armigera field populations in these insecticides resistance monitoring works.

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