Abstract
Observations in the field indicated that tomato variety ‘Tiny Tim’ was more resistant to greenhouse whitefly, Trialeurodes vaporariorum (Westwood), than variety ‘Delicious.’ Experiments were carried out to obtain additional information on the performance of the whitefly on the 2 varieties and to determine how host plant resistance might affect the chalcid parasite Encarsia formosa Gahan and its whitefly host.

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