Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)’nın hassas populasyonu üzerinde topikal biyoanaliz yöntemiyle on iki insektisit için lethal doz (LD50) değerlerinin belirlenmesi
Determination of lethal dose  values of twelve insecticides by using topical bioassay method in susceptible  population of <em>Helicoverpa armigera</em> (Hübner) (Lepidoptera: Noctuidae)
Yazar: Uğurlu  Karaağaç, Sakine; Konuş, Metin
Dergi: Bitki Koruma Bülteni, Vol. 52 No. 3, 2012
Anahtar kelimeler: Yeşilkurt, Helicoverpa armigera, insektisitler, insektisit dayanıklılığı

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.

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.