TY - JOUR N2 - 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. L1 - http://journals.pan.pl/Content/118675/PDF/267-272_Studies%20on%20occurrence%20and.pdf L2 - http://journals.pan.pl/Content/118675 PY - 2004 IS - No 3 EP - 272 KW - Heracleum sosnowskyi Manden. KW - Philophylla heraclei L. KW - Diptera KW - Trypetidae A1 - Wrzesińska, Danuta PB - Committee of Plant Protection PAS PB - Institute of Plant Protection – National Research Institute VL - vol. 44 DA - 08.10.2004 T1 - Studies on occurrence and harmfulness of celery fly Philophylla heraclei L. on Sosnowski’s hogweed Heracleum sosnowskyi Manden SP - 267 UR - http://journals.pan.pl/dlibra/publication/edition/118675 T2 - Journal of Plant Protection Research ER -