Abstract
Longevity, reproduction, and rate of nymphal development of 3 successive generations of the pea aphid (PA), Acyrthosiphon pisum (Harris), and the spotted alfalfa aphid (SAA). Therioaphis maculata (Buckton), were determined when they were reared on 6 alfalfa clones. Clones 1388 and 1-418 were highly susceptible, and N-556 and N-529 were highly resistant to both aphids. Clones C902 and N-466 were moderately resistant to PA but highly resistant to SAA. Reproductive rates, cumulative number of nymphs, and length of reproductive periods varied from maximal on susceptible to low or 0 on highly resistant clones. Developmental rates of SAA appeared more directly affected than PA by the various plants. Molting difficulties appeared on clone N-522 for the 3rd and 4th SAA instars which may have caused the lag phases observed. The results indicate that probably different metabolic mechanisms of both plant and insect may govern the responses of the 2 aphids.
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