Abstract
PROOF of rapid spread of yellows viruses (BYV and BMYV) in sugar beet crops by wingless Myzus persicae1, coupled with evidence of large populations of this aphid on sugar beet and mangold seed crops2, led to the suggestion that if plants in these seed crops were infective while still symptomless the control measures used in the seed crops since 19503, which have reduced heavy visible inspection in these crops to much lower levels4, may, nevertheless, not have impaired their efficiency as sources of these diseases for the root crop1.
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