Primary status of insecticide resistance in the cotton bollworm, Helicoverpa armigera (Hubner) in Iran
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
The cotton bollworm, Helicoverpa armigera (Hubner) is one of the most destructive pest wordwide, attacking many agricultural crops such as cotton, tomato, maize and potato.
Chemical control is still the dominant management strategy used by Iranian producers.
As insecticide resistance is a possible risk to successful management programs and due to lack of resistance report in Iranian populations, in the present study, the degree of insecticide resistance in H. armigera against thiodicarb was evaluated. H. armigera larvae were collected from cotton fields in Gorgan (Golestan Province), in 2016, and reared on an artificial diet at 26±2°C, 70±5% RH, and a photoperiod of 16:8 L:D under laboratory conditions. The bioassay was evaluated on newly moulted third-instar larvae and percentage mortality was evaluated 48 h after application of the insecticide in the artificial diet.
The results showed that the field population has reduced susceptibility against thiodicarb with resistance level around 20-fold. This is the first record of resistance to insecticide in H. armigera in Iran. Possible resistance mechanism is under investigation and our study suggests that resistance
management strategies could be applied at the farm.
Chemical control is still the dominant management strategy used by Iranian producers.
As insecticide resistance is a possible risk to successful management programs and due to lack of resistance report in Iranian populations, in the present study, the degree of insecticide resistance in H. armigera against thiodicarb was evaluated. H. armigera larvae were collected from cotton fields in Gorgan (Golestan Province), in 2016, and reared on an artificial diet at 26±2°C, 70±5% RH, and a photoperiod of 16:8 L:D under laboratory conditions. The bioassay was evaluated on newly moulted third-instar larvae and percentage mortality was evaluated 48 h after application of the insecticide in the artificial diet.
The results showed that the field population has reduced susceptibility against thiodicarb with resistance level around 20-fold. This is the first record of resistance to insecticide in H. armigera in Iran. Possible resistance mechanism is under investigation and our study suggests that resistance
management strategies could be applied at the farm.
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