Abstract
Ecological studies in beet seed fields of Arizona in 1961 and 1962 showed migrant green peach aphids, Myzus persicae (Sulzer), transmitting both beet western yellows and beet yellows viruses to beet seed fields at least 1 month prior to initiation of aphid-control programs. Green peach aphids transmitted persistent beet western yellows virus predominantly in the fall and semipersistent beet yellows virus in the spring. Aphids collected from safflower, Carthamus tinctorius L., did not transmit either virus.
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