The number of viruliferous thrips dispersing from winter annual weeds into crops in spring affects tomato spotted wilt virus (TSWV) prevalence. The effects of weed management practices associated with spring land preparation for planting on the number and temporal dispersal patterns of Frankliniella fusca (Thripidae) were studied. Plots of caged common chickweed (Stellaria media) supporting populations of F. fusca were killed by spraying glyphosate at an early or late date, disking, or mechanically with a hoe. Control chickweed plots were not killed. Thrips dispersing from the chickweed were monitored weekly using yellow, sticky traps placed 0.76 m above the soil within each cage. Compared to the control, significantly more F. fusca dispersed from the glyphosate-treated plots during the 3 weeks following application of the herbicide. Subsequently, few F. fusca dispersed from glyphosate-treated plots resulting in more total F. fusca dispersing from the control plots than the glyphosate-treated plots over the course of the experiment.