Aphid species of genus Macrosiphum Passerini, 1860 (Hemiptera, Sternorrhyncha: Aphididae) inhabiting Knautia L. in Belarus

摘要

A morphological analysis of extensive material from Belarus (45 localities, 117 samples, 2002-2010) confirms that Macrosiphum silvaticum Meier, 1985 is a junior synonym of Macrosiphum knautiae Holman, 1972. Two species of the genus Macrosiphum were found on Knautia arvensis in Belarus in 2002-2010: M. rosae (Linnaeus, 1758), and M. knautiae Holman, 1972, the latter species being predominant. In addition to common key characters, a canonical discrimination function (Rakauskas 2003) is necessary to ensure exact morphological discrimination between the two species.