Field evaluation of nucleopolyhedrosis virus and some biorational insecticides against Helicoverpa armigera Hubner (Noctuidae: Lepidoptera)

Abstract

American bolloworm, Helicoverpa armigera Hubner (Noctuidae: Lepidoptera) is considered as a major pest of various crops all over the world. It is mainly controlled by indiscriminate use of synthetic insecticides in the world due to which this pest developed resistance to most of the available insecticides. Therefore, in the current study, the efficacy of virulent strain of HaNPV (0.5 × 10 9 PIB/ml) alone and in combination with recommended doses of spintoram (20 g/100 L of water) and emamectin benzoate (200 ml/100 L of water) was tested in field. The combination of HaNPV with spintoram and emamectin benzoate 100% reduced the larval population as compared to emamectin benzoate and HaNPV alone. This suggested that the combination of spintoram and emamectin benzoate with HaNPV could be used in field to manage the infestation of H. armigera .

Evaluation of the Effectiveness of Some Synthetic Insecticides Against Cotton Bollworm, Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)

“…Widely usage of synthetic insecticides could develop resistance, therefore the use of a virulent strain of HaNPV in combination with recommended larvicide of Spintoram and Emamectin benzoate was tested in the field. The combination of HaNPV with Spintoram and Emamectin benzoate 100% reduced the larval population as compared to Emamectin benzoate and HaNPV alone (Abid et al, 2020). Comparative study of the H. armigera susceptibility to conventional insecticides showed The susceptibility of third instar H. armigera and H. zea larvae to Indoxacarb, Methomyl, Spinetoram, and Spinosad and showed Spinetoram and Methomyl exhibited the highest acute toxicity against H. armigera (da Silva et al, 2020).…”

Bioefficacy of Emamectin Benzoate against American Bollworm, Helicoverpa armigera Under Field Conditions. الفعالية الحيوية لمبيد إيمامکتين بنزوات ضد دودة اللوز الأمريکية بمحصول القطن تحت الظروف الحقلية

“…provides the most versatile fiber which accounts for about 50% of the total fiber consumption in the world. The loss in cotton yield reached 87% owing to agricultural insect pests (Abid et al, 2020a). The bollworm complex consists of three bollworms viz., American (Helicoverpa armigera, Hubner), spotted (Earias spp.…”

“…), and pink (Pectinophora gossypiella). American bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae) is a dangerous pest of numerous plant families producing losses of several billion dollars annually (Abid et al, 2020a). American bollworm has extensive hosts including most commercially grown crops.…”

“…Emamectin benzoate 5 SG (EB) is one of the bioinsecticides confirmed to be greatly active against lepidopteran insects (Moustafa et al, 2018;Temiz, 2020;Liu, 2021). EB belongs to the avermectin family of 16-membered macrocyclic lactones generated by the soildwelling microorganism, Streptomyces avermitilis (Lopez et al, 2010;Abid et al, 2020a). It is a promising bioinsecticide for lepidopteran insect management.…”

“…It is a promising bioinsecticide for lepidopteran insect management. Furthermore, this pesticide can manage several species of lepidopteran such as; Heliothis virescens, Plutella xylostella, Pseudoplusia includes, Spodoptera frugiperda, Trichoplusia ni, Spodoptera littoralis, Spodoptera exigua, and Mamestra Brassicae (Argentine et al, 2002, Firake andPande 2009;Bengochea et al, 2014;El-Sheikh, 2015;Moustafa et al, 2016) with low toxicity to non-Lepidopteran and most beneficial insects (Abid et al, 2020a).…”