TOXICITY OF THIAMETHOXAM/CHLORANTRANILIPROLE, NOVALURON, CHLORPYRIFOS-METHYL AND METHOMYL AGAINST TWO DIFFERENT LARVAL INSTARS OF THE COTTON LEAFWORM Spodoptera littoralis (Boisd.) ON TOMATO PLANTS

Barrania, A. A.; El-Khawalka, M. H. M.; El-Bessomy, M. A.

doi:10.21608/jppp.2012.83779

TOXICITY OF THIAMETHOXAM/CHLORANTRANILIPROLE, NOVALURON, CHLORPYRIFOS-METHYL AND METHOMYL AGAINST TWO DIFFERENT LARVAL INSTARS OF THE COTTON LEAFWORM Spodoptera littoralis (Boisd.) ON TOMATO PLANTS

Document Type : Original Article

Authors

Plant Protection Res. Inst., Etay El-baroud Agric. Res. Station. Agric. Res. Center, Egypt.

10.21608/jppp.2012.83779

Abstract

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^thinstars S. littoralis larvae. Results revealed that tested insecticides were more effective on second instar than forth instar and showed significant differences between tested insecticides.