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Effects of Anion and Cation Inhibitors and Carbonic Anhydrase Inhibitors upon the Activity of the Gypsy Moth (Lepidoptera: Lymantriidae) Nucleo-polyhedrovirus

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Twenty chemicals that were reported to act as anion transport inhibitors, cation transport inhibitors, and inhibitors of carbonic anhydrase activity were tested at a 1% concentration (wt:wt) for their effects upon the biological activity of the gypsy moth, Lymantria dispar (L.), nucleopolyhedrovirus (LdMNPV). Among the five anion transport inhibitors tested, flufenamic acid acted as a viral enhancer. None of the seven inhibitors of K+ enhanced viral activity and three (4-aminopyridine, diacetyl, and procaine) significantly reduced the activity of LdMNPV. All four Na+ transport inhibitors (abietic acid, amiloride, dicyclohexylcarbodiimide, triamterene) acted as viral enhancers. Triamterene was the most active enhancer, as the LC50 was reduced by ≈1,750-fold. Five carbonic anhydrase inhibitors were tested and four (acetazolamide, hydrochlorothiazide, methazolamide, sulfanilamide) enhanced the activity of LdMNPV. Acetazolamide (a carbonic anhydrase inhibitor), amiloride (a Na+ transport inhibitor), and flufenamic acid (an anion transport inhibitor) were tested singly and in different combinations. Every combination tested (acetazolamide/amiloride, acetazolamide/flufenamic acid, amiloride/flufenamic acid, acetazolamide/amiloride/flufenamic acid) significantly decreased the LC50 from 7.79 PIB/mm2 to a value as low as 0.008 PIB/mm2 (amiloride/flufenamic acid).

Keywords: Lymantria dispar; enhancement; inhibitors; viral activity

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493-95.2.237

Publication date: April 1, 2002

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  • 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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