Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

New records of the monophagous herbivors on the neophyte Impatiens glandulifera: Siobla sturmi (Klug, 1817) (Hymenoptera: Tenthredinidae) and Xanthorhoe biriviata (Borkhausen, 1794) (Lepidoptera: Geometridae).

Abstract

In 2005, larvae of saw wasp Siobla sturmi (Klug, 1817) and the geometrid moth Xanthorhoe biriviata (Borkhausen, 1794) were found on I. glandulifera (Balsaminaceae) for the first time. These observations were made in a valley adjacent to the Wehra River Valley (southern Black Forest, Baden-Württemberg). The switch to the new alien host plant likely is due to the plant's massive spread into the cool and moist habitat of the original host plant (I. noli-tangere). A single experiment indicates that S. sturmi accepts the new host for oviposition, when the plant is dominant.