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Twenty-two cultivars and three selections of red raspberry were evaluated for resistance to the aphids Amphorophora agathonica and Aphis rubicola in New York. ‘Canby’, ‘Lloyd George’ and ‘NY 632’ were immune to A. agathonica ; ‘Washington’ and ‘Mailing Exploit’ demonstrated potentially useful levels of resistance. No immunity to Aphis rubicola was observed, but several cultivars manifest considerable resistance. Resistance to A. agathonica was not correlated with resistance to A. rubicola .
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Kennedy et al. (1973) studied this question.
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