Authors: Ishtiaq, M.; Saleem, Mushtaq A.

Source: Journal of Economic Entomology, Volume 104, Number 4, August 2011 , pp. 1343-1348(6)

Publisher: Entomological Society of America

Abstract:

Two field populations of Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) from Dera Ghazi Khan (D.G. Khan) and Multan, Pakistan, were tested for resistance to the 10 most commonly used insecticides in Pakistan by using a standard leaf disc bioassay on the F₁ progeny. For comparison, a susceptible strain was generated from the Multan strain, which displayed lower LC₅₀ values for most of the insecticides, by either mass rearing without exposure to insecticides or single-pair crosses against selected insecticides. The single-pair crosses generated a more susceptible strain than mass rearing. The D.G. Khan field strain was highly resistant to cypermethrin, profenofos, spinosad, abamectin, and chlorpyrifos and moderately resistant to deltamethrin, indoxacarb, and methoxyfenozide compared with susceptible lab strain. The Multan strain was highly resistant to profenofos and indoxacarb. Both field populations were susceptible to emamectin benzoate and lufenuron. Rotating these two insecticides with others that show very low, low, or moderate levels of resistance and have different modes of action may be useful for the effective management of this pest.

Keywords: Spodoptera exigua; generating susceptible strain; insecticide resistance; resistance management

Document Type: Research article

DOI: http://dx.doi.org/10.1603/EC10383

Publication date: 2011-08-01

More about this publication?

• Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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