Technical Abstract: Whiteflies in the Bemisia complex are a global pest on numerous horticultural crops. The effect of production practices on the population of the B-biotype sweetpotato whitefly, Bemisia tabaci (Gennadius), is only partly understood. A study was conducted to examine the effect of different rates of three selected sulfur-containing fertilizers (ammonium sulfate, potassium sulfate, and superphosphate) on the population of B. tabaci in 10 selected vegetable crops. Three different rates were tested in the field for each fertilizer, but the specific rates varied among crops to reflect local recommendations in comparison with higher and lower rates. Egg, nymph, and adult whitefly counts were generally elevated with increased rates of ammonium sulfate or decreased rates of potassium sulfate. Conversely, within crops, whitefly populations were generally similar among the rates for the superphosphate fertilizer treatments. Field and laboratory data suggested a reduction in whitefly counts on cabbage and cucumber in response to increased rates of ammonium sulfate. Although each fertilizer in the study provides more than one essential nutrient to the crops, the results from the study support that certain sulfur-containing fertilizers may affect the population of the sweetpotato whitefly in vegetable crops.