Występowanie mszyc z rodziny bawełnicowatych (Eriosomatidae) na topoli czarnej (Populus nigra)

In the town greenery of Skierniewice on black poplar (Populus nigra) ‘Italica’ the occurrence of two species of gall-inducing aphids was noted: Pemphigus spyrothecae and Pemphigus bursarius. About 70% of trees have been infested with these aphids. In 2012-2013, on black poplar the most abundant was P. spy-rothecae (64-78.5%), whilst the other species – P. bursarius was less numerous (20.6-35.2%). In the neighbourhood of the city park on black poplar ‘Italica’ appeared also another aphid species Pemphigus populinigrae, however its population was rather scarce (0.8-0.9%). Completely different species composition was noted in nurseries producing alley trees, including black poplar ‘Italica’. The most numerous were Thecabius affinis (48.7%) and Pemphigus populi (33.3%), whilst other species: P. bursarius (12.8%) and Pemphigus populinigrae (5.2%) were less abundant.