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Figure 4a


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Figure 4b


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Figure 4c


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Figure 4d


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Figure 4e
Figure 4. Ecdysteroid fluctuations during the 4th instar and during pharate adult development for silverleaf whiteflies reared on five host plants. Whiteflies were staged and collected, extracts prepared and ecdysteroid concentrations determined by EIA as described in Materials and Methods. Each value represents the mean ± S. E. of at least five separate determinations and is expressed in femtograms 20-hydroxyecdysone equivalents/whitefly or /10 µg wet weight. Means having the same letters were not significantly different. Greenbean and tomato plants have pubescent leaves; cotton, collard and sweet potato plants have glabrous leaves.
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