Determination of lethal dose values of twelve insecticides by using topical bioassay method in susceptible population of <em>Helicoverpa armigera</em> (Hübner) (Lepidoptera: Noctuidae)

Abstract

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 important 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), profenofos (0.096 µg/larva), pyridalyl (0.011 µg/larva), spinosad (0.015 µg/larva) and zeta-cypermethrin (0.003 µg/larva) by using topical bioassay method. The determined LD50 values in susceptible population of H. armigera will be used to detect resistance ratios of H. armigera field populations in these insecticides resistance monitoring works.

Keywords

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Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)’nın hassas populasyonu üzerinde topikal biyoanaliz yöntemiyle on iki insektisit için lethal doz (LD50) değerlerinin belirlenmesi

Öz

Anahtar Kelimeler

• Yeşilkurt, Helicoverpa armigera, insektisitler, insektisit dayanıklılığı

Kaynakça

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