Cotton plant densities of 10 or 40 thousand plants/acre had no effect on numbers of silverleaf whitefly, Bemisia argentifolii Bellows and Perring, adults, eggs, nymphs, extracted sugars from lint samples or thermodetector sticky cotton counts. Higher numbers of whiteflies occurred in early-season in Pima S-7 cotton than in DPL 50 or DPL 5415 cotton. Seasonal averages for sugars, percentages of total reducing sugars and thermodetector counts were higher for DPL 50 compared with Pima S-7 but not DPL 5415. The first open cotton bolls subject to honeydew contamination occurred between 17 and 22 August. Most of the sugar analyzed from lint samples occurred during a 24 day period from 22 August to 15 September for all cultivars harvested 25 September. DPL 50 and DPL 5415 had 99 and 91% of the bolls open during 22 August to 25 September as compared to 76% for Pima S-7 resulting in lower sticky cotton counts for Pima S-7 compared with DPL 50 but not DPL 5415. Insecticide treatments reduced thermodetector counts and associated sugars extracted from lint. Sticky cotton results for 20 boll randomly picked samples were comparable with results from total open cotton/plant harvests but both sample methods gave significantly lower individual sugar, percentage of total reducing sugars and thermodetector counts compared with machine-picked total cotton plot harvests. DPL 50 and DPL 5415 produced significantly more cotton than Pima S-7. Higher lint yields occurred in plots planted at 40,000 plants per acre compared with 10,000 plants per acre. Highest cotton harvests were obtained by hand picking all open bolls from all plants in 13.1 foot of row weekly as compared to a single 13.1 foot of row pick on 13 September and machine picking (spindle) on 25 September.