Journal Article

Laboratory and Field Evaluation of Spinosad Formulation Natular T30 Against Immature Culex Mosquitoes (Diptera: Culicidae)

in Journal of Medical Entomology

Published on behalf of Entomological Society of America

Volume 51, issue 4, pages 837-844
Published in print July 2014 | ISSN: 0022-2585
Published online December 2014 | e-ISSN: 1938-2928 | DOI: https://dx.doi.org/10.1603/ME13134
Laboratory and Field Evaluation of Spinosad Formulation Natular T30 Against Immature Culex Mosquitoes (Diptera: Culicidae)

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Spinosad consisting of spinosyn A and D is derived from a naturally occurring, soil-dwelling bacterium, Saccharopolyspora spinosa. Spinosyns are neurotoxins that activate postsynaptic nicotinic acetylcholine and gamma-aminobutyric acid receptors and cause rapid excitation of the insect nervous system and ultimately exhaustion and death of the targets. During the past 30 yr, numerous spinosad-based formulations have been developed and applied to control various arthropod pests of agricultural importance. Natular T-30 is a new slow-release formulation containing 8.33% spinosad for use in mosquito larval control programs. High-level larvicidal activity, as indicated by low LC50 and LC90 levels, was demonstrated against Culex quinquefasciatus Say in the laboratory. Larvicidal efficacy was evaluated in semifield microcosms, field mesocosms, and underground storm drains. Fair performance against larval populations of Culex spp. and other mosquito species was achieved, although low efficacy during the initial few days posttreatment was encountered. This slow-release formulation will play an important role in controlling mosquitoes in persistent breeding sources.

Keywords: spinosad; Culex quinquefasciatus; microcosm; mesocosm; underground storm drain

Journal Article.  4995 words.  Illustrated.

Subjects: Disease Ecology and Epidemiology ; Entomology

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