Abstract
The effects of the host plant on the level of parasitism, development time and mortality ofEncarsia formosa Gahan parasitizing castor whitefly,Trialeurodes ricini Misra were studied. The level of parasitism varied significantly between host plants; ranging from an average high of 13/50T. ricini larvae parasitized per parasitoid per day on aubergine to an average low of 1.6/50 host larvae on potato. Development time ofE. formosa varied according to whitefly host plant; minimum average development time was 17.7 days on cotton. The mortality ofE. formosa was high on all host plants tested, and the type of host plant had no significant influence on mortality. Aubergine proved to be the most satisfactory laboratory plant for rearingE. formosa onT. ricini.
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