Response of maize hybrids to Spodoptera frugiperda (J. E. Smith) infestation and the impact of insecticides under field conditions
Keywords:
Fall armyworm, Maize geotypes, Pesticides, Open fieldAbstract
This study was carried out to evaluate the relative susceptibility of eight maize hybrids to Spodoptera frugiperda (J. E. Smith) infestation under field conditions during 2023 and 2024 seasons at Nubaria district, Beheira Governorate, Egypt. The results revealed that none of the hybrids exhibited high resistantance to the pest, but SC128 and SC130 hybrids showed moderate resistance. In the first season, TW352 and TW360 hybrids received the highest number of egg masses, while SC130 and SC128 were the least attractive for oviposition. A similar trend was observed in 2024, with TW352 and TW360 being the most preferred for oviposition. The abundance of larvae was measured during both seasons, showing that TW352 hosted the highest number of larvae, while SC130 had the lowest. These findings were consistent across the two years. Additionally, the infestation percentages were highest in TW352 and lowest in SC130. In both years, infestation percentages significantly differed among the hybrids, indicating into variations in susceptibility. Insecticidal treatments revealed that Pleo and Lannate were the highest efficient, with Pleo exhibiting the best residual effect. Coragen, though effective, induced the lowest larval mortality rate in both seasons. This research highlights the importance of selecting maize hybrids resistant to S. frugiperda, with the application of effective insecticides to manage S. frugiperda infestations. These results contribute valuable insights for enhancing maize pest management programs and improving crop protection strategies.
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