Study on the Ecology, Biology and Ethology of the Invasive Species Corythucha arcuata Say, 1832 (Heteroptera: Tingidae), a Danger to Quercus spp. in the Climatic Conditions of the City of Sibiu, Romania

Abstract

This scientific paper examines the impact of climate change on the spread and survival of the invasive species Corythucha arcuata Say, 1832 (oak lace bug, or OLB) in Romania. The OLB is native to the Eastern USA and Canada, and in its native habitat, it coexists with minimal impact to the preferred host plant species Quercus. However, in Europe, the OLB in high density causes early defoliation, slowing tree growth. As Quercus spp. is a keystone species, the impact of the OLB on European forests is significant. This paper aims to address several gaps in knowledge about the OLB by presenting findings from a study conducted by the Lucian Blaga University of Sibiu (ULBS) in Romania. The study identified the species’ chronology of spread, ecology, ethology and biology of the species, in addition to foliage classification to determine the extent of attack. The study found a direct link between the temperature and the speed of the generational lifecycle. The findings support the thesis that climate change is enabling the healthy, rapid density growth of OLB, which is a danger to the Quercus spp. Further research is needed in the area of the thermal tolerance of the OLB, and the research conducted by the ULBS represents the first documented research into the thermal constant of the insect. The paper concludes that further research must be in the direction to understand how and where these insects survive during winter to find future management measures and identify chemical or biological methods as solutions to eradicate and stop the expansion of the invasion of the OLB, and the potential consequences for the Quercus sp.

The effect of the oak powdery mildew, oak lace bug, and other foliofagous insects on the growth of young pedunculate oak trees

“…L. dispar, T. viridana, E. defoliaria, and O. brumata have also been a topic of many studies (Ivashov et al, 2002;Tikkanen and Julkunen-Tiitto, 2003;Glavendekić, 2010;Milanović et al, 2020aMilanović et al, ,b, 2022. C. arcuata is still a new species for Europe so it is currently intensively studied (Bernardinelli, 2006;Franjević et al, 2018;Drekić et al, 2019;Nikolic et al, 2019;Csóka et al, 2020;Kern et al, 2021;Marković et al, 2021a;Bălăcenoiu et al, 2021b;Paulin et al, 2023;Stancă-Moise et al, 2023;Valdés-Correcher et al, 2023). As pedunculate oak is one of the most significant European oaks (Eaton et al, 2016;Mölder et al, 2019) we conducted a study to determine: how C. arcuata and other foliophagous insects affect the growth of young pedunculate oak trees; which type of foliofagous insect damage is dominant on the leaves; how oak powdery mildew affects the growth of young trees; and does the influence of foliofagous insect on the growth of young oak trees differ from the influence of oak powdery mildew.…”