Tifton 85 bermudagrass (T-85) is increasingly being adopted by dairymen because of its high productivity and nutritive value, but defoliation management practices and associated insect populations (pest and beneficial) have not been evaluated under intensive greenchop production. Dry matter yield (greenchop) was examined under four defoliation intervals (21, 24, 27, and 35 days; subplots) and two stubble heights (short, 7 cm and tall, 14 cm; main plots) that were evaluated in a split-plot experiment with three replicates in a established stand of T-85 used for greenchop in a commercial dairy in North-Central Florida. There were a total of 6, 5, 4, and 3 harvests during the 2007 season (June-Oct) for 21, 24, 27, and 35 day defoliation frequencies, respectively; therefore data was analyzed by harvest. Additionally, weekly insect population counts were conducted to evaluate the incidence of beneficial and pest insects. Dry matter yields, averaged across harvests and stubble heights, were 1150, 3150, 3060, and 5140 kg ha^-1 for 21, 24, 26, and 35 days, respectively. Dry matter yield showed significant interactions (P=0.02) of defoliation interval with stubble height depending on harvests. More uniform greenchop production per harvest seems to be associated when T-85 is cut at taller than shorter stubble. However, preliminary analyses indicate higher pest levels were associated with higher stubble heights. Defoliation management of T-85 for greenchop will need to take into consideration not only greenchop production but also pests levels.