The efficiency of some new insecticides, (sulfoxaflor and flupyradifurone) were compared with three neonicotinoid insecticides (clothianidin, thiamethoxam and acetamiprid), at recommended rates, against Bemisia tabaci, Aphis gossypii and their parasitoid on cucumber plants, during 2017and 2018 summer seasons at Nubarya district, El-Beheira Governorate. Results showed that, sulfoxaflor and flupyradifurone exhibited excellent and fast action activity against B. tabaci and A. gossypii, and the least reduction percentages were recorded by acetamiprid at both seasons. Under the same conditions, three neonicotinoid insecticides had moderate toxic effect against natural enemies; Chrysoperla carnea and Coccinella spp, while, sulfoxaflor and flupyradifurone had slightly toxic effect. The present study suggests the use of sulfoxaflor and flupyradifurone are preferred insecticides, with less harmful effects on the fitness components of natural enemies, for integrated pest management of sucking insects at cucumber plants.
The toxicity of thiamethoxam/chlorantraniliprole, novaluron, chlorpyrifos-methyl and methomyl applied at recommended rates was studied against the cotton leafworm Spodoptera littoralis on tomato plants, during the summer seasons of 2010 and 2011 at Etay El-baroud Agricultural Research Station, El-Beheira Governorate. The % mortalities average (initial kill) caused by thiamethoxam/chlorantraniliprole, novaluron, chlorpyrifos-methyl and methomyl were 83.8, 84.8, 91.2 and 87.4%, respectively against 2 nd instar of Spodoptera larvae, and were 82.5, 77.2, 89.9 and 87.4%, respectively against 4 th instar of Spodoptera larvae, while %mortality average (residual toxicity) were 86.0, 70.5, 71.9 and 62.6%, respectively against 2 nd instar of Spodoptera larvae, and were 71.7, 61.9, 67.6 and 56.9%, respectively against 4 th instar of Spodoptera larvae. From these data it is clear that the two novel tested insecticides have a potent insecticidal activity against both 2 nd and 4 th instars S. littoralis larvae. Results revealed that tested insecticides were more effective on second instar than forth instar and showed significant differences between tested insecticides.
Toxicity of chlorpyrifos-methyl, methomyl, chlorantraniliprole, thiamethoxam and novaluron at two low concentrations (1/2 & 1/4 field recommended rates) and their binary mixtures were tested against 4 th instar of Spodoptera littoralis larvae at two cotton TOXICITY OF SOME CONVENTIONAL, NONCONVENTIONAL INSECTICIDES AND THEIR MIXTURES AGAINST COTTON LEAF WORM, SPODOPTERA LITTORALIS (BOISD.
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