Authors: Rajapakse, Champa N. K.; Meola, Roger; Readio, Janice

Source: Journal of Medical Entomology, Volume 39, Number 6, November 2002 , pp. 889-894(6)

Publisher: Entomological Society of America

Abstract:

The efficacy of a photostable formulation of methoprene and two photostable juvenoids, fenoxycarb and pyriproxyfen, and their residual activity in inhibiting the emergence of adult cat fleas, Ctenocephalides felis (Bouché), was studied in topsoil. Nursery pots composed of clay, peat, and plastic, and wooden flats were used to hold soil samples. Treated soil samples were exposed to sunlight during the 63-d study period. Methoprene was as effective as fenoxycarb and pyriproxyfen against cat fleas for up to 42 d in clay, peat, and plastic pots at a concentration of 64.56 mg (AI)/m² (6 mg [AI]/ft²), but its activity declined significantly thereafter. In contrast, fenoxycarb and pyriproxyfen showed strong residual activity for the entire 63 d. The activity of methoprene declined even more rapidly over time in wooden flats, while at the same concentrations the other two juvenoids showed significant residual activity for 63 d. Clay, peat, and plastic pots were therefore considered to be equally effective for evaluating the outdoor efficacy of juvenoids in comparison to the wooden flats. However, results obtained with wooden flats may be more realistic when testing residual activity of volatile chemicals such as methoprene. Fenoxycarb and pyriproxyfen showed strong efficacy and residual activity at concentrations of 8.07, 16.14, and 32.28 mg (AI)/m², whereas methoprene did not cause a significant reduction of adult emergence at levels below 64.56 mg (AI)/m². LC₅₀ values for methoprene, fenoxycarb, and pyriproxyfen needed for preventing flea emergence when applied to topsoil were estimated to be 0.643, 0.031, and 0.028 ppm, respectively.

Keywords: Ctenocephalides felis; cat fleas; pyriproxyfen; fenoxycarb; methoprene

Document Type: Research article

Publication date: 2002-11-01

More about this publication?

• Journal of Medical Entomology is published bimonthly in January, March, May, July, September, and November. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.
  
  The journal is divided into the following sections: Morphology, Systematics, Evolution; Sampling, Distribution, Dispersal; Development, Life History; Population and Community Ecology; Behavior, Chemical Ecology; Population Biology/Genetics; Molecular Biology/Genomics; Neurobiology, Physiology, Biochemistry; Vector Control, Pest Management, Resistance, Repellents; Arthropod/Host Interaction, Immunity; Vector/Pathogen/Host Interaction, Transmission; Vector-Borne Diseases, Surveillance, Prevention; Direct Injury, Myiasis, Forensics; Modeling/GIS, Risk Assessment, Economic Impact. In addition to full-length research articles, the journal publishes interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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