Biological Control of Ambrosia Artemisiifolia: Learning from the Past

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Session 7 Ecological and Evolutionary Processes 319 Biological Control of Ambrosia artemisiifolia: Learning from the Past H. Müller-Schärer1 and U. Schaffner2 1University of Fribourg, Department of Biology, Unit Ecology and Evolution, Chemin du Musée 10, 1700 Fribourg, Switzerland [email protected] 2CABI Europe-Switzerland, 2800 Delémont, Switzerland, [email protected] Abstract Common ragweed, Ambrosia artemisiifolia L., has uniquely raised the awareness of invasive plants. The main concern is its particularly large production of highly allergenic pollen that causes allergic rhinitis and severe asthma in over 20% of the population of affected areas. Furthermore, ragweed is presently the worst weed of major crops in North America and several countries in Eastern Europe. Its range is still expanding in Europe and is likely to accelerate under a changing climate. We plan to initiate and coordinate long-term management options such as biological control and vegetation management, as sustainable control measures are lacking in Europe. Ragweed is an excellent target for biological control and up to now Ambrosia has been subjected to classical biological control programs in Russia, Australia, and eastern Asia with variable success, as Australia alone has implemented a successful biological control program, resulting in a benefit to cost ratio of >100. Recently the first successes have also been documented for China. Building on the extensive studies on antagonists of ragweed in its native range in North America and on the biological control activities conducted worldwide, we recently proposed a set of seven prime candidate agents for a classical or inundative biological control of Ambrosia in Europe. Of special interest are agents with a very narrow host-range that reduce pollen and seed production, the stage most sensitive for long-term population management of this winter annual. Integration of biological control and of habitat management into existing short-term control measures may then lead to a sustainable management strategy of Ambrosia in Europe. See our recent publication: Gerber, E., Schaffner U., Gassmann A., Hinz, H.L., Seier M. and Müller-Schärer H. (2011) Prospects for biological control of Ambrosia artemisiifolia in Europe: learning from the past. Weed Research 51, 559-573. XIII International Symposium on Biological Control of Weeds - 2011.

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Amb's : the Spearheads of Ambrosia
Issue 13, December 2004 Amb’s : The Spearheads of Ambrosia Ambrosia artemisiifolia is popularly known as “ragwort”, “annual ragweed” or “short ragweed”, and is really just that: a weed. And not a harmless one… Indeed, A. artemisiifolia has already put many people’s lives in danger and is threatening to become an acute public health problem throughout the world. The good part though is that the battle waged against Ambrosia has brought about a better understanding of a number of proteins which are at the heart of the damaging effects the plant has on certain people. A modern ailment Nowadays, farmers do not feed their cattle with hay but with fodder made up of grass that has Two hundred years ago, had you been suffering been cut before it has had time to flower. Yet in from the effects of hay fever and attempted to spite of the resulting decrease in pollen, cases of describe your symptoms to a doctor, he would hay fever continue to increase. And now, to cap it have been – to say the least – puzzled. In fact, it all, a new formidable enemy has cropped up in the was only in 1819 that the condition was first fully last few years: Ambrosia. described in a scientific review by a London practitioner. For a long time, this mysterious affliction – known as ‘Bostock’s catarrh’ – was Once food for the Gods, now just a weed described as ‘a rare and most extraordinary condition’. It started as a minor medical curiosity Ambrosia –meaning ‘food for the Gods’ – covers to become, within the space of two centuries, a 40 different species that are mainly found in the very common ailment which affects 10 to 18% of temperate regions of America.
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Common Ragweed (Ambrosia Artemisiifolia L.) Interference with Soybean in Nebraska
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