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Fumigant Toxicity of Ziziphora clinopodioides (Boiss.) (Lamiaceae) Against Adults and Eggs of Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae)

Keywords: Callosobruchus maculatus (Fab.) , essential oil , fumigant toxicity , Ziziphora clinopodioides

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Abstract:

The insecticidal and ovicidal effects of essential oil extracted from Ziziphora clinopodioides (Boiss.) (Lamiaceae) were tested on adults and eggs of Callosobruchus maculatus (Fab.). Oil concentrations of 9, 12.5, 17.6, 24.5 and 34.2 μl L-1 air were tested on adults while concentrations of 3.5, 5.8, 9.7, 16.1 and 26.7 μl L-1 air were tested on eggs. Adults and eggs were exposed for 24, 48 and 72 h. After each exposure, insecticide effect was estimated by counting the number of dead adults of C. maculatus while ovicidal effect was estimated by counting the number of unhatched eggs. Results showed that the oil had high fumigant action against adults and eggs, the adults being more susceptible than the eggs. After 72 h of exposure to an oil concentration of 34.2 μl L-1 air , the adult mortality was 94.65% while the egg mortality was 61.10% for an oil concentration of 26.7 μl L-1 air . The lowest values after 72 h were observed on adults of C. maculatus (Fab.) (4.01). The LC50 amount for eggs at this time was 16.98 μl L-1 air . Progeny was reduced by 57.76% after a 72 h exposure of oil at a concentration of 34.2 μl L-1 air. Fumigant effects of this essential oil were considered to warrant further research into their potential for commercial use.

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