Figure 2. Mean weights of Stage -7, -8 and –9 silverleaf whiteflies reared on five host plants. Plants were infested with whiteflies that had been maintained on a variety of plants, and weights of individuals were determined as described in Materials and Methods. Each value represents the mean ± S. E. of at least 10 separate determinations. GB = greenbean; SP = sweet potato. Greenbean and tomato plants have pubescent leaves; cotton, collard and sweet potato plants have glabrous leaves.