Field studies were conducted during 1997 to determine the effect of various harvest aid chemicals on the cotton variety ‘DPL 5409' at 60 to 70% boll opening. Applications were applied in water at 10 gallons per acre (gpa) to cotton in plots of four rows each spaced 40 inches apart, 40 feet long and replicated four times in a randomized complete block design. Visual ratings were made of the percent defoliation and percent boll opening at 7 and 14 days after treatment (DAT) and of the percent shoot regrowth at 21 DAT whereby 0 = no effect and 100% = complete effect. The least significant difference (LSD) between means was determined by Fisher's Protected LSD test at the 10% level. The harvest aid chemicals with their descriptions and manufacturers are listed in Table 1.