@ARTICLE{Wrzesińska_Danuta_Studies_2004, author={Wrzesińska, Danuta}, volume={vol. 44}, number={No 3}, journal={Journal of Plant Protection Research}, pages={267-272}, howpublished={online}, year={2004}, publisher={Committee of Plant Protection PAS}, publisher={Institute of Plant Protection – National Research Institute}, abstract={Studies on occurrence and harmfulness of celery fly on Sosnowski’s hogweed plants were performed in 1999–2002 in three plots at Minikowo, Mochełek and Topolno. At Mochełek, Minikowo and Topolno 40.65, 39.42 and 32.14% ofleaves, respectively were occupied by generation I ofthe fly while 14.8, 18.12 and 10%, respectively by the generation II. Most mines were caused by generation I in 2000 and 2002 at Minikowo and Mochełek. Generation II was characterized by a low population density in all plots.}, type={Artykuły / Articles}, title={Studies on occurrence and harmfulness of celery fly Philophylla heraclei L. on Sosnowski’s hogweed Heracleum sosnowskyi Manden}, URL={http://journals.pan.pl/Content/118675/PDF/267-272_Studies%20on%20occurrence%20and.pdf}, keywords={Heracleum sosnowskyi Manden., Philophylla heraclei L., Diptera, Trypetidae}, }