Abstract
Control of Liriomyza trifolii (Burgess) in commercially grown chrysanthemums in greenhouse trials was evaluated using three strategies: pesticide application two times per week (grower); an insect growth regulator (IGR) application; and biological control (BC) with no chemical applications until late in the crop. In the BC and IGR greenhouses, considerable migration of natural parasite fauna ( Diglyphus spp.) occurred, but Chrysacham parksi Crawford, which was released, failed to become established. Populations of adult L. trifolii were highest in the BC greenhouse, followed by the IGR and grower greenhouses, although percentage of parasitism exceeded 95% in the IGR and BC greenhouses. Parasitism increased, moving from the top to bottom strata of the chrysanthemum plant. Potential of parasites and IGR applications for control of L. trifolii on commercially grown chrysanthemums is discussed.
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