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.
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1 July 2014
Laboratory and Field Evaluation of Spinosad Formulation Natular T30 Against Immature Culex Mosquitoes (Diptera: Culicidae)
Tianyun Su,
Min-Lee Cheng,
Jennifer Thieme
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Journal of Medical Entomology
Vol. 51 • No. 4
July 2014
Vol. 51 • No. 4
July 2014
Culex quinquefasciatus
Mesocosm
Microcosm
spinosad
underground storm drain