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Nous avons mesuré chez des cirons des champignons ( Tyrophagus putrescentiae) adultes l'absorption de phosphine et étudié in vivo et in vitro les effets inhibiteurs de ce gaz sur la cytochrome C-oxydase et la catalase. Nous avons constaté que la phosphine a réduit l'activité des deux enzymes, les valeurs d'inhibition relative des enzymes pouvant être décrites comme suit : catalase in vivo > catalase in vitro, cytochrome C-oxydase in vivo < cytochrome C-oxydase in vitro; les effets inhibiteurs in vitro étaient proportionnels à la durée de l'exposition des extraits cytosoliques à la phosphine. L'absorption de phosphine chez les cirons des champignons adultes augmente lorsque la concentration du gaz et la durée de l'exposition s'élèvent, mais la vitesse d'absorption est alors moins élevée que lorsque la concentration est faible et l'exposition courte. ll semble que le mécanisme d'absorption de la phosphine ne soit pas le même chez les acariens que chez les insectes.The inhibitory effects of phosphine gas on cytochrome C oxidase and catalase, both in vivo and in vitro, and gas uptake by adults of Tyrophagus putrescentiae were determined. The activities of both enzymes were reduced by the gas. Relative inhibition rates of the enzymes were : in vivo catalase > in vitro catalase, in vivo cytochrome C oxidase < in vitro cytochrome C oxidase, and the inhibition effects of in vitro enzymes were proportional to the exposure period of phosphine applied to the cytosolic extracts. Although the uptake of phosphine by adults increased with an increase of phosphine concentration and exposure period, the rate of uptake was relatively slower than at low concentration and short exposure period. The absorption mechanism of phosphine between insects and mites appears to be different

Toxic action of phosphine on the adults of copra mite Tyrophagus putrescentiae [Astigmata : Acaridae]