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Efficiency of bean yellow mosaic virus (BYMV) transmission from broad bean source plants varied with age of leaf on which aphids, MYZU8 persicae (Sulz.), fed. Duration of infection in the source plants did not affect transmission. Observations of acquisition feeding behaviour yielded results which are interpreted to indicate that most transmission occurs with virus acquired intracellularly.
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K. G. Swenson (1962) studied this question.
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