Penestragania apicalis (Osborn & Ball, 1898), another invasive Nearctic leafhopper found in Europe: (Hemiptera: Cicadellidae, Iassinae)

Penestragania apicalis (Osborn & Ball, 1898), eine weitere invasive nearktische Zikade in Europa gefunden (Hemiptera: Cicadellidae, Iassinae). – Im Jahr 2010 wurde die nearktische Zikadenart Penestragania apicalis (Osb. & Ball) erstmalig in Europa gefunden. Insgesamt sind derzeit 16 Fundorte in Frankreich, der Schweiz, Deutschland und Österreich bekannt; daher ist davon auszugehen, dass die Art bereits seit längerer Zeit fest etabliert und in Europa und vielleicht weltweit weiter verbreitet ist. Wie in Nordamerika lebt sie an Gleditschie (Gleditsia triacanthos L.), überwintert im Eistadium und hat eine oder zwei Generation pro Jahr, mit adulten Tieren von mindestens Ende Juni bis Anfang Oktober. Ob in Europa wirtschaftlich relevante Schäden verursacht werden, ist noch unklar.In 2010 the Nearctic leafhopper Penestragania apicalis (Osb. & Ball) was found for the first time in Europe. Altogether there are now 16 known localities in France, Switzerland, Germany and Austria indicating that the species is well es‐ tablished for a rather long period and more widespread in Europe and perhaps worldwide. As in North America it lives on honeylocust (Gleditsia triacanthos L.), overwinters in the egg stage and probably has one or two generations a year, with adults at least from late June until early October. It is yet unclear if it causes relevant damage to the host plant in Europe

Bark Beetle Population Dynamics in the Anthropocene: Challenges and Solutions

Tree-killing bark beetles are the most economically important insects in conifer forests worldwide. However, despite >200 years of research, the drivers of population eruptions and crashes are still not fully understood and the existing knowledge is thus insufficient to face the challenges posed by the Anthropocene. We critically analyze potential biotic and abiotic drivers of population dynamics of an exemplary species, the European spruce bark beetle (ESBB) (Ips typographus) and present a multivariate approach that integrates the many drivers governing this bark beetle system. We call for hypothesis-driven, large-scale collaborative research efforts to improve our understanding of the population dynamics of this and other bark beetle pests. Our approach can serve as a blueprint for tackling other eruptive forest insects