Laboratory analysis reveals chromens affect toxicity and biological parameters in Earias insulana and Spodoptera littoralis.
El-Tahawe, H.S., W.A.Z. El-Medany, E.M. Abd-ElAzeem and M.H.A. Metayi. 2024. Toxicological and Latent Effect of Chromens on Biological Parameters of Earias insulana and Spodoptera littoralis Under Laboratory Conditions. Arab Journal of Plant Protection, 42(1): 88-93. https://doi.org/10.22268/AJPP-001203 This study focused on toxicological and biological consequences of three chromens synthesized chemical compounds against spiny bollworm, Earias insulana (Boisd.) 1st instar larvae and cotton leafworm, Spodoptera littoralis (Boisd.) 2nd and 4th instar larvae under constant conditions of 26±1ºC. temperature and 70±5% relative humidity. The study investigated toxicological and latent effects of chromens on freshly hatched E. insulana larvae and 2nd and 4th instar larvae of S. littoralis. Synthetic chromene compounds were found to be particularly harmful to newly hatched spiny bollworm larvae, followed by 2nd and 4th instar larvae of S. littoralis. The results obtained indicated that the range of the LC50 values of the three compounds was 126.85-364.39 ppm against newly hatched E. insulana. Whereas, the LC50 range of the three compounds against the 2nd instar larvae of S. littoralis was 31671-103006 ppm. The weight of the two insects' larvae and pupae, as well as male and female longevities and fertility, were all significantly reduced. Furthermore, results showed that the tested chemical compounds reduced hatchability rates significantly.
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El-Tahawe et al. (2024) studied this question.