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AbstractEffects of some artificial substrates on the ability of the entomopathogenicnematode Steinernema feltiae to kill adult Musca domestica were studied.Replicate samples of different substrates were treated with known numbers ofS. feltiae suspended in 0.25 M sucrose. Then 30 adult female flies wereconfined above each sample in a crystalizing basin and mortality counts werecarried out 48 h later. The most effective substrates were poplin cotton,potting compost, silver sand and Fibertex SF250 horticultural capillarymatting, which gave LD50 in the range of 2815 to 8912 S. feltiae.Conversely, Perlite was the least efficient material and required between531 450 and 899 930 S. feltiae to achieve the LD50. These effects appearedto be related to the total porosity (ratio of the volume of air spaces ineach material to its bulk volume) of each material, with the most efficientmaterials having total porosities in a median range of between 0.81 and0.14. The significance of these observations is discussed. Les effets decertains substrats artificiels sur l’aptitude du nématode entomopathogèneSteinernema feltiae à tuer les adultes de Musca domestica ont été étudiés.Des sérics d’échantillons de différents substrats ont été traitées avec desnombres connus de S. feltiae en suspension dans une solution de saccharose0,25 M. Trente mouches femelles adultes ont été ensuite enfermées au-dessusde chaque échantillon, dans un cristallisoir, et des dénombrements demortalité effectués 48 h plus tard. Les substrats les plus efficaces ont étéla popeline de coton, le terreau de rempotage, le sable micacé et leFibertex SF250, une natte capillaire horticole, qui ont permis d’atteindrela LD50 dans la fourchette de 2815 à 8912 S. feltiae. Par contre, la Perlites’est révélée le matériau le moins efficace, et il a fallu entre 531 450 et899 930 S. feltiae pour atteindre la LD50. Ces effets semblent liés à laporosité totale (rapport entre le volume des espaces remplis d’air danschaque matériau et son volume en vrac) des matériaux, celle des plusefficaces étant située dans une fourchette médiane de 0,81 et 0,14.L’importance de ces observations est discutée.
Nematology – Brill
Published: Jan 1, 2000
Keywords: TOTAL POROSITY; ADULT HOUSEFLIES; ENTOMOPATHOGENIC NEMATODES; MORTALITY
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