Journal of Medical Entomology (1998) 35, 814-817

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M.I. Picollo, C.V. Vassena, A.A. Casadio, J. Massimo and E.N. Zerba (1998)
Laboratory studies of susceptibility and resistance to insecticides in Pediculus capitis (Anoplura : Pediculidae)
Journal of Medical Entomology 35 (5), 814-817
Abstract: The susceptibility of local head lice to permethrin, sumithrin, deltamethrin, and carbaryl was determined by laboratory bioassays in field-collected colonies. Head lice collected from the infested heads of children 6-12 yr old were tested within 3 h of collection. The longest survival of control insects in the laboratory was obtained by keeping them in the dark at 18°C and 70-80% RH. The base line susceptibility data obtained for insects collected from children not treated for lice, the reference colony, showed that deltamethrin caused the highest mortality, of the insecticides tested (LC50, 0.06%). Permethrin, sumithrin, and carbaryl showed no significant difference in mortality (superposition of confidence intervals), being 10 times lower than that caused by deltamethrin. All field-collected lice required a higher LC50 of permethrin than the reference colony. Resistance levels varied from 3 to >100 for colonies that were taken from children treated with anti-lice products. Lice colonies with permethrin resistance showed resistance to sumithrin and deltamethrin, but resistance was not observed to the carbamate carbaryl.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): María Inés Picollo, Eduardo N. Zerba

Research topic(s) for pests/diseases/weeds:
control - general
pesticide resistance of pest

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Pediculus humanus