Abstract
Life tables and host preference tests were used to assess the resistance of six cultivars of field peas, Pisum sativum L., to pea aphid, Acyrthosiphon pisum (Harris), in the laboratory. Antibiosisresistance in ‘Tipu’ and ‘Century’ was expressed as decreased aphid fecundity and longevity. Although differences in the reproductive rate were considerable, because prereproductive periods were similar among cultivars, there were only slight differences in the aphids’ intrinsic rate of increase (r m) among cultivars. At 10 d after infestation, ‘Tipu’ exhibited the most and ‘Triumph’ the least antixenotic resistance. At 20 d, ‘Triumph’ was still the preferred cultivar. ‘Trapper’, on which aphids had the greatest r m value, appeared to have some tolerance to aphid feeding.
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