Effect of gamma irradiation on reproduction biology, inherited sterility and mating competitiveness of Spodoptera exigua (Lepidoptera: Noctuidae) under laboratory conditions | ||
| Journal of Crop Protection | ||
| Article 3, Volume 13, Issue 2, 2024, Pages 139-151 PDF (749.05 K) | ||
| Document Type: Original Research | ||
| DOI: 10.48311/jcp.2024.1661 | ||
| Author | ||
| Shabnam Ashouri* | ||
| Department of Plant Protection, Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, Karaj, Iran. | ||
| Abstract | ||
| The beet armyworm, Spodoptera exigua Hübner, poses a significant threat affecting sugar beet and various field crops and vegetables. AS larvae can devastate entire plants, it is crucial to implement effective and safe control measures to prevent economic losses. However, traditional chemical control methods disrupt ecosystem balance and contribute to the development of insecticide resistance. This study explores the potential of the sterile insect technique (SIT) and inherited sterility to manage S. exigua through the irradiation of pupae with Co60 gamma rays. Key factors such as reproduction, sterility, growth biology, sex ratio, mating competitiveness, and inherited sterility in both parent (P1) and F1 generations were assessed. Notably, irradiation of pupae at 250 Gy and 400 Gy resulted in sterile P1 males and females, respectively. While female emergence significantly decreased at 400 Gy, their longevity increased with higher doses. When P1 male or female pupae were irradiated at 250 Gy or 180 Gy, respectively, the developmental period of F1 larvae extended beyond that of the control group. Additionally, F1 male emergence declined with increasing irradiation doses. Crossbreeding treated male parents with normal females resulted in a sex ratio of F1 progeny skewed in favor of males. The F1 generation exhibited greater sterility compared to the P1 generation, with F1 males demonstrating a higher level of sterility than F1 females. Laboratory assessments of mating competitiveness revealed that males irradiated at 250 Gy (IM) successfully competed against untreated males (UM) for mating with untreated females (UF), even at a 1:1: 1 ratio of IM:UM:UF. | ||
| Keywords | ||
| beet armyworm; Co60 Gamma ray; F1 sterility; Radiation biology; sterile insect technique | ||
| References | ||
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