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Université de Fribourg

Explaining variability in the production of seed and allergenic pollen by invasive Ambrosia artemisiifolia across Europe

Lommen, Suzanne T. E. ; Hallmann, Caspar A. ; Jongejans, Eelke ; Chauvel, Bruno ; Leitsch-Vitalos, Melinda ; Aleksanyan, Alla ; Tóth, Peter ; Preda, Cristina ; Šćepanović, Maja ; Onen, Huseyin ; Tokarska-Guzik, Barbara ; Anastasiu, Paulina ; Dorner, Zita ; Fenesi, Annamária ; Karrer, Gerhard ; Nagy, Katalin ; Pinke, Gyula ; Tiborcz, Viktor ; Zagyvai, Gergely ; Zalai, Mihály ; Kazinczi, Gabriella ; Leskovšek, Robert ; Stešević, Danijela ; Fried, Guillaume ; Kalatozishvili, Levani ; Lemke, Andreas ; Müller-Schärer, Heinz

In: Biological Invasions, 2017, p. 1–17

To better manage invasive populations, it is vital to understand the environmental drivers underlying spatial variation in demographic performance of invasive individuals and populations. The invasive common ragweed, Ambrosia artemisiifolia, has severe adverse effects on agriculture and human health, due to its vast production of seeds and allergenic pollen. Here, we identify the scale and...

Université de Fribourg

Biological control opportunities of ragweed are predicted to decrease with climate change in East Asia

Sun, Yan ; Zhou, Zhongshi ; Wang, Rui ; Müller-Schärer, Heinz

In: Biodiversity Science, 2017, vol. 25, no. 12, p. 1285-1294

The control of invasive alien plants (IAP) that jeopardize our ecosystems and economy constitutes a significant challenge for natural resource management. Classical biological control referring to the introduction of specialist antagonists from the native range has proven to be a highly cost-effective management tool against IAP. A critical issue in biological control research is to guide...

Université de Fribourg

Direct effects of insecticides on common ragweed-implications for natural enemy exclusion trials

Lommen, Suzanne T. E. ; Fogliatto, Silvia ; Vidotto, Francesco ; Citterio, Sandra ; Augustinus, Benno A ; Müller-Schärer, Heinz

In: Journal of Pesticide Science, 2018, p. -

Experimentally applying pesticides is an important method to assess the efficacy of weed biocontrol agents, but potential direct effects of the chemicals on plant performance are controversial or unknown. We assessed how three broad-spectrum insecticides applied in combination affect the performance of the widely invasive, crop-yield reducing, allergenic common ragweed (Ambrosia...

Université de Fribourg

An early suitability assessment of two exotic Ophraella species (Coleoptera: Chrysomelidae) for biological control of invasive ragweed in Europe

E.Lommen, Suzanne T. ; Jolidon, Emilien F. ; Sun, Yan ; Eduardo, José I. Bustamante ; Müller-Schärer, Heinz

In: European Journal of Entomology, 2017, vol. 114, no. 1, p. 160–169

Classical biological control is an important means of managing the increasing threat of invasive plants. It constitutes the introduction of natural enemies from the native range of the target plant into the invaded area. This method may be the only cost-effective solution to control the rapidly expanding common ragweed, Ambrosia artemisiifolia, in non-crop habitats in Europe. Therefore,...

Université de Fribourg

Biological invasion of oxeye daisy (Leucanthemum vulgare) in North America: Pre-adaptation, post-introduction evolution, or both?

Stutz, Sonja ; Mráz, Patrik ; Hinz, Hariet L. ; Müller-Schärer, Heinz ; Schaffner, Urs

In: PLOS ONE, 2018, vol. 13, no. 1, p. e0190705

Species may become invasive after introduction to a new range because phenotypic traits pre-adapt them to spread and become dominant. In addition, adaptation to novel selection pressures in the introduced range may further increase their potential to become invasive. The diploid Leucanthemum vulgare and the tetraploid L. ircutianum are native to Eurasia and have been introduced to North...

Université de Fribourg

Invasive alien plants benefit more from clonal integration in heterogeneous environments than natives

Wang, Yong-Jian ; Müller-Schärer, Heinz ; Kleunen, Mark van ; Cai, Ai-Ming ; Zhang, Ping ; Yan, Rong ; Dong, Bi-Cheng ; Yu, Fei-Hai

In: New Phytologist, 2017, vol. 216, no. 4, p. 1072–1078

What confers invasive alien plants a competitive advantage over native plants remains open to debate. Many of the world's worst invasive alien plants are clonal and able to share resources within clones (clonal integration), particularly in heterogeneous environments. Here, we tested the hypothesis that clonal integration benefits invasive clonal plants more than natives and thus confers...

Université de Fribourg

Defoliation of common ragweed by Ophraella communa beetle does not affect pollen allergenicity in controlled conditions

Lommen, Suzanne T. E. ; Ciappetta, S. ; Ghiani, A. ; Asero, R. ; Gentili, R. ; Müller-Schärer, Heinz ; Citterio, S.

In: Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2017, vol. 151, no. 6, p. 1094–1100

Ragweed allergy is one of the primary causes of seasonal allergies in Europe and its prevalence is expected to rise. The leaf beetle Ophraella communa, recently and accidentally established in N-Italy and S-Switzerland, represents a promising approach to control ragweed, but negative side effects should be excluded before its use. Since biotic and abiotic stresses are known to influence the...

Université de Fribourg

Phenology and temperature‐dependent development of Ceutorhynchus assimilis, a potential biological control agent for Lepidium draba

Virag, A. von ; Bon, M.C. ; Cloşca, C. ; Diaconu, Alecu ; Haye, T. ; Weiss, R. M. ; Müller-Schärer, Heinz ; Hinz, H. L.

In: Journal of Applied Entomology, 2017, vol. 141, no. 3, p. 219–230

Lepidium draba (Brassicaceae) is a major concern for agriculture and biodiversity in the western United States. As current control methods do not provide long-term, sustainable solutions, research has been conducted to find biological control agents. Ceutorhynchus assimilis is one of the currently investigated candidates. Known as oligophagous in the literature, a specialist clade of this...

Université de Fribourg

Climatic suitability ranking of biological control candidates: a biogeographic approach for ragweed management in Europe

Sun, Yan ; Brönnimann, Olivier ; Roderick, George K. ; Poltavsky, Alexander ; Lommen, Suzanne T. E. ; Müller-Schärer, Heinz

In: Ecosphere, 2017, vol. 8, no. 4, p. -

Biological control using natural antagonists has been a most successful management tool against alien invasive plants that threaten biodiversity. The selection of candidate agents remains a critical step in a biocontrol program before more elaborate and time- consuming experiments are conducted. Here, we propose a biogeographic approach to identify candidates and combinations of candidates to...