Abstract
A field trial involving 24 cultivars of lucerne was naturally infested by three species of aphids, Therioaphis trifolii (Monell) f. maculata, spotted alfalfa aphid, Acyrthosiphon kondoi Shinji, bluegreen aphid and A. pisurn (Harris), pea aphid. Aphid establishment was found to be related to the lucerne aphid resistance ratings of these cultivars. These observations suggest that both antixenosis and antibiosis resistance mechanisms are operating.
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