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SUMMARY Aerial migrations of Metopolophium dirhodum over Europe in 1979 measured by suction traps at a height of 12.2 m indicated that alates flew first in the south of France where the warm climate probably encouraged early population increase. Subsequent spread across Europe was gradual and northerly, with the largest populations occurring in East Anglia in late July. The date of the population peak at each site was correlated with latitude, being later at northerly sites, and probably also with crop development.

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