Control of Arbovirus Vector Verrallina funerea (Diptera: Culicidae) in Southeast Queensland, Australia

Authors: Jeffery, Jason A. L.; Kay, Brian H.; Ryan, Peter A.

Source: Journal of Economic Entomology, Volume 100, Number 5, October 2007 , pp. 1512-1518(7)

Publisher: Entomological Society of America

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Abstract:

In Australia, the brackish water mosquito Verrallina funerea (Theobald) (Diptera: Culicidae) is a serious pest and vector of Ross River and Barmah Forest viruses in coastal areas in the northeast of the continent. We report on the first extensive evaluation of the efficacy of various pesticides against this species, including laboratory dose–response assays and small plot field trials. In the laboratory, Ve. funerea was susceptible to temephos (Abate 100E) (lethal concentration, 95% endpoint [LC95] of 1.651 ppb), Bacillus thuringiensis subsp. israelensis de Barjac (Bti) (VectoBac 12AS) (LC95 of 0.033 ppm), s-methoprene (ProLink Liquid Larvicide [PLL]) (emergence inhibition, 95% endpoint [EI95] of 2.647 ppb), and technical grade pyriproxyfen (EI95 of 0.227 ppb). In contrast, Ve. funerea was highly refractory to Bacillus sphaericus Neide (VectoLex WG) (LC95 of >855.3 ppm). The survival of adults exposed as larvae to sublethal doses of s-methoprene was reduced for those doses greater than the EI50, although sex ratios were unaffected. Field trials demonstrated that Ve. funerea was susceptible to Bti (VectoBac G at 7 kg/ha) and s-methoprene (ProLink ProSand at 4 kg/ha), with these products giving >99 and >98% control, respectively. We also observed a significant increase in immature mortality in s-methoprene-treated pools, suggesting that s-methoprene field trials based solely on emergence inhibition of pupae may underestimate the efficacy of this insecticide.

Keywords: emergence inhibition; insecticides; sublethal; survival

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493(2007)100[1512:COAVVF]2.0.CO;2

Publication date: October 1, 2007

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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