Toxicity and biochemical impacts of some new insecticide mixtures on cotton leafworm Spodoptera littoralis (Boisd.)

Abstract

Abd El-Mageed A.E.M., Shalaby S.E.M. (2011): Toxicity and biochemical impacts of some new insecticide mixtures on cotton leafworm Spodoptera littoralis (Boisd.). Plant Protect. Sci., 47: 166-175.The susceptibility to five new insecticide mixtures: chlorosan, feroban, cygron, engeo, and kingbo was studied in the 2 nd and 4 th instar larvae of the cotton leafworm Spodoptera littoralis (Boisd.). The efficiency and residual effects of these compounds against S. littoralis under field conditions were also investigated. Obtained results revealed that feroban was the most effective compared with the other toxicants, while engeo was the least toxic insecticide in both instars after 2 and 5 days from treatment. Data also indicated that feroban had the longest half-life (Lt 50 ) while engeo recorded the shortest one. Biochemical analysis showed that the tested compounds caused pronounced changes in acetyl cholinesterase and phenol oxidase.

Enzymatic Changes and Toxic Effect of Some Aromatic Plant Oils on The Cotton Leafworm, Spodoptera littoralis (Boisd.)

“…In addition results showed that the 2 nd instar larvae were more susceptible to tested oils than the 4 th instar larvae. These results of the effectiveness of tested essential oils coincide with those obtained by other authors (Abd El-Aziz and Ezz El-Din, 2007;Marei et al, 2009;Abd El-Mageed and Shalaby, 2011;Shabnum and Wagay, 2011;Hassan, 2012;Khedr and El-Kawas, 2013;Abdel-Aziz et al, 2013;and Ali et al, 2017). The efficacy of the applied oils met these criteria for the applied dipping assays.…”

Synthesis of novel 5‐substituted imidazolinones as insecticides against cotton leaf worm (Spodoptera littoralis)

“…The experiments that used to study the toxicity of the 5‐imidazolinone derivatives (1‐18) against “the second instar larvae of S . littoralis ” occurred by the “the leaf dip technique” . In this technique, the emulsions of the synthesized compounds in water containing 0.1% triton X‐100 were prepared and immediately used.…”

The effects of Kingbo biopesticide on Tetranychus urticae Koch female adults

“…The 24 h exposure, however, was still sufficient for causing significant sublethal effects, especially in females exposed to concentrations of 34.3 μl/l and 24 μl/l. In laboratory bioassays, oxymatrine and/or oxymatrine-based products have shown considerable toxic and antifeedant activity against several insect pest species (Mao and Henderson, 2007;Asghari-Tabari et al, 2009;Abd El-Mageed and Shalaby, 2011). The only available information on their acute toxicity to mites had been reported by Wang et al (2009), who found the combination of oxymatrine/psoralen to have an LC 50 of 150 μg/l for carmine spider mite, T. cinnabarinus.…”