Abstract
When excised leaves and whole plants of resistant and susceptible alfalfa clones were held at 27°C Therioaphis maculata (Buckton) given a free choice generally preferred the more susceptible plants. When the alfalfa was held at 10°C the aphids reacted to some resistant plants as if they were susceptible. Also, the preference of the aphids for 1 clone changed depending on whether excised leaves or whole plants were offered.
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