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Predation of the Booklouse Liposcelis entomophila (Enderlein) by Blattisocius dentriticus (Berlese) and Their susceptibility to Deltamethrin and Fenitrothion

Published online by Cambridge University Press:  19 September 2011

N. Mashaya
N. Mashaya
Affiliation:
Tobacco Research Board, P.O. Box 1909, Harare, Zimbabwe E-mail: [email protected]
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Abstract

The predation of the booklouse, Liposcelis entomophila (Enderlein) (Psocoptera; Liposcelidae) by the mite Blattisocius dentriticus (Berlese) (Acari; Ascidae) was studied in a series of laboratory experiments. Known numbers of mites and booklice were placed together in small tubes and counted after various durations. Fewer booklice were found in mite-infested tubes and it was possible to rear the mite on booklice, which supports the view that the mite is a natural predator of L. entomophila. Comparative susceptibility of the mite and booklouse to deltamethrin and fenitrothion was assessed by exposing both arthropod species to deposits of the two insecticides. The mite was found to be very susceptible to both deltamethrin and fenitrothion whereas the booklouse was only susceptible to the latter. The increased prevalence of L. entomophila in tobacco storage and grading buildings in recent years may therefore be attributed, at least in part, to the use of deltamethrin which suppresses its natural enemies.

Résumé

La prédation du poux des livres Liposcelis entomophila (Enderlein) (Psocoptera; Liposcelidae) par l'acarien Blattisocius dentriticus (Berlese) (Acari; Ascidae) a été étudiée dans une série d'expérimentations en laboratoire. Des effectifs connus d'acariens et de poux des livres ont été placés ensemble dans des petits tubes et dénombrés à différents intervalles de temps. On a retrouvé moins de poux des livres dans les tubes infestés par les acariens et il a été possible d'élever les acariens sur les poux des livres ce qui suggère que l'acarien est un prédateur naturel de L. entomophila. La sensibilité de l'acarien et du poux des livres à la deltaméthrine et au fénitrothion a été comparée en exposant les deux espèces d'arthropodes aux deux insecticides. On a constaté que l'acarien est très sensible à la deltaméthrine et au fénitrothion alors que le poux des livres n'est sensible qu'au fenitrothion. La plus grande fréquence de L. entomophila dans les entrepôts de stockage et de tris du tabac au cours des dernières années peut par conséquent être attribuée, en partie, à l'utilisation de la deltaméthrine qui élimine les ennemis naturels.

Keywords

Liposcelis entomophilaBlattisocius dentriticusnatural enemydeltamethrinfenitrothiontobaccostorageLiposcelis entomophilaBlattisocius dentriticusennemi natureldeltaméthrinefénitrothionstockagetabac
Type
Short Communications
Information
International Journal of Tropical Insect Science , Volume 22 , Issue 1 , March 2002 , pp. 75 - 79
Copyright
Copyright © ICIPE 2002

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References

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