Over 1999-2002 a research was carried out in the region of Bydgoszcz, at Minikowo, Mochełek and Topolno, on the dynamics of the occurrence and harmfulness of bean aphid (Aphis fabae complex) on Sosnowski’s hogweed (Heracleum sosnowskyi Manden.). The pest species occurred in all the research stands. The greatest aphid intensity in inflorescences was observed in 2002 at Minikowo and Mochełek. Aphis fabae was the most abundant on leaves at Mochełek in 2002 and 2000. Aphids feeding on hogweed leaves caused leaf yellowing and rigidity. Heavily infested with A. fabae, umbellules were blackening and wilting. The plants heavily infested with aphids were lower and developed umbellules smaller in diameter.

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