Efficacy of some natural oils on the residual toxicity of emamectin benzoate, spinosad and spinetoram against Egyptian cotton leafworm

Document Type : Original Article

Authors

1 Plant Protection Research Institute, ARC, Bacous, Sabahia, Alexandria Egypt

2 Central Pesticides Laboratory, Sabahia Station

3 Dep. Pesticide Chem., Faculty of Agric. El-Shatby, Univ. Alexandria, Egypt

10.21608/jpces.2008.459594

Abstract

During the 2006 and 2007 growing seasons, two semi-field trials were carried out to determine the efficacy of two plant oils (neem and jojoba) and two light mineral oils (Star and Kemesol) on the persistence and residual toxicity of emamectin benzoate, spinosad and spinetoram as determined by cotton leafworm, Spodoptera littoralis, 2nd instar larvae bioassay. The aim of this study was to extend the residual life (increasing persistence) and to increase the residual toxicity of these insecticides. The tested insecticides were applied at the recommended rates, while oil concentrations were selected for field testing based on their performance in a laboratory study. Results showed that, jojoba oil (at 200 ppm) increased the residual toxicity of spinosad, spinetoram and emamectin benzoate against the 2nd instar larvae of S. littoralis during the two seasons. Also, neem oil (at 200 ppm) extended the residual toxicity of spinosad, spinetoram and emamectin benzoate, but to a lesser extent than jojoba oil. Although, Kemesol and Star mineral oils (at 1500 ppm) increased the toxicity of spinosad, spinetoram and emamectin benzoate in the laboratory, these oils had no effects on the residual toxicity of the tested insecticides in the field.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 16, Issue 1
2008
Pages 37-56

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