Assessment of resistance risk in Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) to chlorantraniliprole
Article first published online: 18 MAY 2011
Copyright © 2011 Society of Chemical Industry
Pest Management Science
Volume 67, Issue 11, pages 1468–1472, November 2011
How to Cite
Lai, T. and Su, J. (2011), Assessment of resistance risk in Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) to chlorantraniliprole. Pest. Manag. Sci., 67: 1468–1472. doi: 10.1002/ps.2201
- Issue published online: 12 OCT 2011
- Article first published online: 18 MAY 2011
- Manuscript Accepted: 6 APR 2011
- Manuscript Revised: 1 APR 2011
- Manuscript Received: 23 NOV 2010
- Spodoptera exigua;
BACKGROUND: Beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), is a major pest of numerous cultivated crops. Chlorantraniliprole, the first commercialised ryanodine receptor insecticide from the anthranilic diamide class, has exceptional insecticidal activity on a range of lepidopteran pests. The aim of this study was to assess the resistance of S. exigua to chlorantraniliprole in the laboratory.
RESULTS: A field-collected population of S. exigua was selected after repeated exposure to chlorantraniliprole to determine the risk of resistance evolution. After 22 generations of selection, there was a 12.0-fold increase in LC50. The realised heritability (h2) of resistance was estimated as 0.1082 by using threshold trait analysis. The projected rate of resistance evolution indicated that, if h2 = 0.1082 and 70% of the population was killed at each generation, then a tenfold increase in LC50 would be expected in 21.7 generations for chlorantraniliprole.
CONCLUSION: These results show that the risk of resistance development to chlorantraniliprole exists in S. exigua after continuous application. Copyright © 2011 Society of Chemical Industry