Practical and economic efficacy of Ambrosia artemisiifolia L. surveillance in compliance with the international standards

Citation: Podberezko, I.M., Pylypenko, L.A., Mar’uschkina, V.Y., Borzykh, O.I. (2013) Practical and economic efficacy of Ambrosia artemisiifolia L. surveillance in compliance with the international standards. Journal of Plant Protection Research, 53( 4 ): 392 – 398

Abstract: Ambrosia artemisiifolia distribution in the Ukraine for the 1973–2013 period was analyzed. The infested areas were consequently grouped into 6 categories. Intense infestation in the region was the reason for the analysis and the categorization. A practical approach to the A. artemisiifolia surveillance system which complied with the International Standards for Phytosanitary Measures concerning “a pest free area”, “pest free places of production”, “pest free production sites” and “an area of low pest prevalence” was recommended. This action should drive the policy-making process to underpin national legislation regarding invasive species. The opportunity also presents itself for improved communications with growers and stakeholders because of the more transparent and cost effective system of A. artemisiifolia surveillance offered. There would be a chance to slow down the A. artemisiifolia invasion even though this invasive species has already occupied 3.6 million hectares.

Potential distribution of two Ambrosia species in China under projected climate change

Citation: Qin, Z., DiTommaso, A., Wu, R. S. and Huang, H. Y. (2014). Potential distribution of two Ambrosia species in China under projected climate change. Weed Research DOI: 10.1111/wre.12100.

Link to Wiley Online Library

Abstract: The invasion of Ambrosia artemisiifolia and Ambrosia trifida from their native range to occupy large areas in China has raised considerable concern. Using the maximum entropy (Maxent) method, we developed models for each Ambrosia species, based on occurrence records from both native ranges (North America) and their invaded ranges (e.g. northern and south-western Europe) to predict the availability and distribution of suitable habitats for these two species in China. For each species, we also assessed potential shifts in habitat suitability for the year 2050, using three general circulation models (GCMs) and two emission scenarios. Elevation and average mean precipitation in October contributed most to model development for both species. Potential distribution projections under future climatic change scenarios suggested an averaged percentage of suitable area (2.21%) and habitat gain (1.49%) in A. artemisiifolia distribution, with further expansion to environmentally favourable locations in south-east coastal regions, northern Taiwan and the Beijing–Tianjin–Tangshan area in northern China. Future predicted percentage of suitable area for A. trifida was 0.03% with a very limited suitable habitat gain of <1% although this species had the potential to continue to spread in northern China. Our findings suggest that management priorities should be focused on A. artemisiifolia, whilst effective control strategies for A. trifida may be optimised by concentrating efforts on those relatively fewer regions of China where the species is currently abundant.

Task Force Population Dynamics kicks off with workshop ragweed demography

Twenty participants, from France to Armenia, gathered Friday 23 May in Montpellier for the first meeting of the Task Force Population Dynamics. In a half-day workshop, organised by the coordinator Suzanne Lommen (CH), and the local organiser Bruno Chauvel (FR), everyone was trained to conduct the protocol, especially developed to study the demography of common ragweed.

Finding the Ambrosia plants

Finding the Ambrosia plants

The participants received the protocol, standardized record forms and help tools. After a presentation, they went outside to practice all aspects of the protocol on an artificially created population in the garden – from setting up the study plots, tagging individual plants, to measuring the viability of seeds extracted from soil samples. In the final discussion, the methods to take measures were optimized and fine-tuned. Now everyone is prepared to monitor their local ragweed populations. An online forum was initiated to share experiences during the field season.

Delimiting plots and measuring plants

Delimiting plots and measuring plants

Sampling soil, extracting and identifying Ambrosia seeds, and analysing their viability

Sampling soil, extracting and identifying Ambrosia seeds, and analysing their viability

COST SMARTER Working Group and Core Group meetings, May 2014

The COST SMARTER Working Group and Core Group meetings were held in Montpellier, France, 23-25 May 2014. The venue was the School of Ingenieurs of Agronomy at Montpellier SupAgro. The meeting was preceded by a special COST SMARTER session on ragweed at the European Weed Research Society’s 4th International Symposium on Weeds and Invasive Plants. The special SMARTER session was held on Thursday 25 May, and included presentations by Prof. Heinz Müller-Schärer from the University of Fribourg in Switzerland (Chair) and Dr Carsten Ambelas Skjøth from the University of Worcester in the UK (Vice-Chair).

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Participants at the COST SMARTER Working Group and Core Group meetings, Montpellier, France, 23-25 May 2014

The main SMARTER meeting kicked off in the morning of Friday 22 May with a workshop on monitoring Ambrosia populations, which was attended by members of the Task Force on Population Dynamics. Working Group meetings convened on Friday afternoon, and continued again on Saturday morning. Many of the participants also continued their discussions during the SMARTER dinner that was held in the old centre of Montpellier on Friday evening.

The Working Group meetings finished on Saturday 23 May with an excursion to view three different Ambrosia species (A. psilostachya, A. tenuifolia, and A. artemisiifolia) at sites with different habitats. The excursion concluded with dinner at a “little French restaurant on the road”, by the historic and picturesque Roman aquaduct “Pont du Gard”. After a busy few days, the SMARTER meeting came to an end at Sunday lunchtime, 25 May, after the Extended Core Group Meeting.

Gradual loss of genetic diversity of Ambrosia artemisiifolia L. populations in the invaded range of central Serbia

Citation: Kočiš-Tubić N., Đan M., Veličković N., Anačkov G., Obreht D. (2014) Gradual loss of genetic diversity of Ambrosia artemisiifolia L. populations in the invaded range of central Serbia. Genetika, 46 (1): 255-268

Link to full text

Abstract: Considering the importance of genetic studies in understanding of invasive species, our main objectives in this study were to analyze the genetic diversity and genetic structure of Ambrosia artemisiifolia populations from Central Serbia, a relatively recently invaded region. Comparing values of genetic measures obtained by microsatellite analyses, a number of differences were detected in genetic diversity between sampled populations of Ambrosia artemisiifolia L. . Allelic richness-r (ranged from 5.42 to 7.80), the mean number of alleles per locus-NA (5.8-8.4) and the mean number of rare alleles per locus-NR (2.8-5.8) have quite similar ranges across populations. We observed greater genetic variability in populations from the northern part of investigated area than in southern populations. Based on pairwise Fst values, AMOVA results and PCo Analysis, moderate differentiation among population was detected, while the STRUCTURE analysis clearly separated SR-Kru and SR-Les. Data obtained for analyses of differentiation and gradual losses of genetic diversity of sampled populations provides useful information about invasion dynamics of common ragweed in recently invaded region.