Insecticidal Activity of Pyriproxyfen, A Juvenoid, and Its Suppressive Effect on Growth and Development of The Black Cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)
A., B., M., T., A., H., K., G. (2021). Insecticidal Activity of Pyriproxyfen, A Juvenoid, and Its Suppressive Effect on Growth and Development of The Black Cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae). EKB Journal Management System, 14(4), 35-61. doi: 10.21608/eajbsa.2021.198980
Bakr, N. A.; Tanani, M.; Hassan, H. A.; Ghoneim, K.. "Insecticidal Activity of Pyriproxyfen, A Juvenoid, and Its Suppressive Effect on Growth and Development of The Black Cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)". EKB Journal Management System, 14, 4, 2021, 35-61. doi: 10.21608/eajbsa.2021.198980
A., B., M., T., A., H., K., G. (2021). 'Insecticidal Activity of Pyriproxyfen, A Juvenoid, and Its Suppressive Effect on Growth and Development of The Black Cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)', EKB Journal Management System, 14(4), pp. 35-61. doi: 10.21608/eajbsa.2021.198980
A., B., M., T., A., H., K., G. Insecticidal Activity of Pyriproxyfen, A Juvenoid, and Its Suppressive Effect on Growth and Development of The Black Cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae). EKB Journal Management System, 2021; 14(4): 35-61. doi: 10.21608/eajbsa.2021.198980

Insecticidal Activity of Pyriproxyfen, A Juvenoid, and Its Suppressive Effect on Growth and Development of The Black Cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)

Egyptian Academic Journal of Biological Sciences. A, Entomology
Article 4, Volume 14, Issue 4, December 2021, Page 35-61  XML PDF (821.78 K)
Document Type: Original Article
DOI: 10.21608/eajbsa.2021.198980
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Authors
Bakr, N. A.1; Tanani, M.1; Hassan, H. A.2; Ghoneim, K.1
1Faculty of Science, Al-Azhar University, Cairo, Egypt
2Institute of Plant Protection Research, Agricultural Research Center, Giza, Egypt
Abstract
The black cutworm Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae), is generally considered to be worldwide in distribution. It is one of the destructive pests attacking nearly all vegetables and different field crops. The objective of the present study was to evaluate the toxicity of pyriproxyfen and its effect on the growth, development, metamorphosis and morphogenesis of this insect. Both the 4th instar and 5th instar larvae were treated with 6 concentrations of this juvenoid (800, 400, 200, 100, 50 & 25 ppm) via fresh discs of castor bean leaves. The most important results could be summarized as follows. Pyriproxyfen exhibited strong acute toxic activity against larvae and chronic toxicity against pupae and adults, after treatment of 4th instar or 5th instar larvae. LC50 values were calculated in 65.95 and 99.90ppm, after treatment of 4th instar and 5th instar larvae, respectively, i.e., the 4th instar larvae were found more sensitive to pyriproxyfen than 5th instar larvae. The larval body weight gain was remarkably reduced and the growth was considerably inhibited. The larval and pupal durations were considerably prolonged, in a dose-dependent course. Failure of ecdysis, as a criterion of the disrupted developmental program, was observed only after treatment with certain concentrations, but other features of the disrupted program had not been observed. The pupation was detrimentally suppressed after treatment of 4th or 5th instar larvae with pyriproxyfen. No deformed pupae were observed. Therefore, pyriproxyfen could be recommended as an eco-friendly alternative to synthetic insecticides for the IPM program of A. ipsilon.
Keywords
Adult; development; growth; larva; metamorphosis; morphogenesis; mortality; pupa
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