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Nous présentons la deuxième partie de l'analyse phytosociologique des prairies dominées par Agrostis stolonifera (all. Pontentillion anserinae Tx. 1947) de la péninsule ibérique et des îles Baléares. A cette occasion, nous caractérisons géobotaniquement quatre associations (dont trois nouvelles) réparties dans les îles Baléares et le secteur ibérique oriental. Le Prunello vulgaris-Agrostietum stoloniferae O. Bolòs & Masalles 1983, caractérisé floristiquement par Trifolium fragiferum et Plantago lanceolata, où, en plus, on distingue deux sousassociations (subass. typicum & subass. juncetosum inflexi subass. nov.) ; le Molinio caeruleae-Agrostietum stoloniferae ass. nov., caractérisé par Molinia caerulea; le Scirpoido holoschoeni-Agrostietum stoloniferae ass. nov., caractérisé par Scirpoides holoschoenus et Equisetum ramosissimum, où l'on distingue également deux sous-associations (subass. typicum et subass. juncetosum subnodulosi subass. nov.) ; et, enfin, le Carici otrubae-Agrostietum stoloniferae ass. nov., caractérisé par Carex otrubae et Poa trivialis., Damos a conocer la segunda parte del análisis fitosociológico de los herbazales dominados por Agrostis stolonifera (all. Pontentillion anserinae Tx. 1947) de la Península Ibérica e Islas Baleares. En esta ocasión, caracterizamos geobotánicamente a cuatro asociaciones (tres de ellas nuevas) que se distribuyen por las Islas Baleares y el sector oriental ibérico. El Prunello vulgaris-Agrostietum stoloniferae O. Bolòs & Masalles 1983, que se caracteriza florísticamente por Trifolium fragiferum y Plantago lanceolata, donde, además, distinguimos dos subasociaciones (subass. typicum y subass. juncetosum inflexi subass. nov.); el Molinio caeruleae-Agrostietum stoloniferae ass. nov., caracterizado por Molinia caerulea; el Scirpoido holoschoeni-Agrostietum stoloniferae ass. nov., caracterizado por Scirpoides holoschoenus y Equisetum ramosissimum, donde también distinguimos dos subasociaciones (subass. typicum y subass. juncetosum subnodulosisubass. nov.); y, finalmente, el Carici otrubae-Agrostietum stoloniferae ass. nov., caracterizado por Carex otrubae y Poa trivialis

Nous présentons les premiers résultats sur l'analyse phytosociologique des prairies hygrophiles dominées par Agrostis stolonifera (all. Pontentillion anserinae Tx. 1947) dans la péninsule ibérique et les îles Baléares. Dans ce premier article, nous caractérisons géobotaniquement deux associations d'Europe centrale qui se développent jusqu'au secteur nord de la péninsule. D'une part, le Rorippo sylvestris-Agrostietum stoloniferae Moor ex Oberd. & T. Müll. in T. Müll. 1961, caractérisée floristiquement par Rorippa sylvestris, Barbarea vulgaris et Equisetum arvense, où, en plus, on distingue deux nouvelles sous-associations (subass. bidentetosum tripartitae nov. et subass. lythretosum salicariae nov.) ; et d'autre part, l'Agrostio stoloniferae-Potentilletum anserinae T. Müll. ex Oberd. 1983, caractérisée par Potentilla anserina, et où nous décrivons une nouvelle sous-association (subass. juncetosum inflexi nov.), Damos a conocer los primeros resultados sobre el análisis fitosociológico de los herbazales dominados por Agrostis stolonifera (Pontentillion anserinae Tx. 1947) de la Península Ibérica e Islas Baleares. En este primer artículo, caracterizamos geobotánicamente a dos asociaciones centroeuropeas que llegan a desarrollarse hasta el sector septentrional de la Península. Por una parte, Rorippo sylvestris-Agrostietum stoloniferae Moor ex Oberd. & T. Müll. in T. Müll. 1961, caracterizada florísticamente por Rorippa sylvestris, Barbarea vulgaris y Equisetum arvense, donde además distinguimos dos subasociaciones nuevas (subass. bidentetosum tripartitae nov. y subass. lythretosum salicariae nov.); y por la otra, Agrostio stoloniferae-Potentilletum anserinae T. Müll. ex Oberd. 1983, caracterizada por Potentilla anserina, y donde describimos una nueva subasociación (subass. juncetosum inflexi nov.)

We explored the total and pathogenic fungi community of sixteen grassland species affiliated to two plant functional groups (grass and forb) grown as monocultures to assess which plant-related predictor, such as plant identity, plant functional group and host phylogeny was better in explaining the variation in fungal richness and community structure among the plants studied. Moreover, we investigated the response of the fungal community to drought. Briefly, the experiment consisted of plant communities comprised of the following plant species: the grasses Agrostis stolonifera, Anthoxanthum odoratum, Arrhenatherum elatius, Briza media, Festuca pratensis, Festuca rubra, Phleum pratense, Trisetum flavescens and forbs Achillea millefolium, Centaurea jacea, Galium mollugo, Leontodon hispidus, Leucanthemum vulgare, Prunella vulgaris, Ranunculus repens, and Sanguisorba officinalis. The plant species were grown in plot of 70 cm x 70 cm, with six replicates for each plant species, leading to a total of 96 plots. These plots were distributed in 3 blocks, which contained 2 plots (2 replicates) of each of the sixteen species per block. In the growing season of the fourth year (10 June -14 July 2017) a drought treatment was set up in half of the replicates using rainout shelters and supplementary watering of control plots.

Slechts een beperkt aantal Nederlandse greenkeepers heeft ervaring opgedaan met het doorzaaien van hun greens met iSeed struisgras. Bij het STRI werd hiernaar in 2011 en 2012 een onderzoek gedaan. In deze Greenkeeper geven we u een korte samenvatting van dit onderzoek, en van de ervaringen met het doorzaaien op de green van de Kennemer. Daarbij is natuurlijk de ene soort struisgras de andere niet! ‘Doorzaaien met struisgras om de samenstelling van de grasmat te veranderen, is natuurlijk een uitdaging."

Agrostis stolonifera is in Nederland de minst gebruikte variëteit van de grassoort Agrostis. Van dit grassoort zijn enkele tientallen variëteiten bekend. In Amerika, wordt Agrostis stolonifera vooral gekweekt en gebruikt op golfbanen en dan specifiek voor de putting greens. Dit grassoort produceert horizontale, ondergronds groeiende wortels, stolonen genaamd. Onder gunstige omstandigheden stellen zij dit grassoort in staat een zeer dichte grasmat te vormen en de competitie te winnen van polvormende grassen en onkruid met brede bladeren. In een gazon kan deze agressieve grassoort met zijn andere bladstructuur voor problemen zorgen. Door het woekergedrag kunnen stolonen boven het maaiveld uitgroeien, terwijl plekken met struisgrassen opvallen

Marco Wouters is trots op zijn greens met 99 procent witstruis die jaarrond egaal en groen zijn. Ze liggen op de course van Wassenaarse Golf Groendael. Deze luxe baan werd vijf jaar geleden aangelegd volgens Amerikaanse karakteristieken: veel grondverplaatsing (500.000 kuub) en wit struisgras op de greens

Growth and development of creeping bentgrass ( Agrostis stolonifera L.) under non-competitive and competitive conditions were studied.Growth chamber experiments under non-competitive conditions with high and low tiller producing bentgrass populations produced plants with differing tiller appearance rates. However, the plants developed at a similar rate with respect to growth stage (using West's growth stages for stoloniferous plants). The populations produced similar above ground dry weights plant -1. Dry weight partitioning patterns between tillers within the populations were different with the high tiller producing population demonstrating a more even dry matter distribution.Tiller development patterns were similar under long and short days. Short days led to a reduced growth stage and tillering rate and retarded stolon development. The low tillering population had more coleoptilar tillers than the high tillering population. Coleoptilar tillers accounted for a large portion of the difference in tiller number between the short and long day environments for the low tillering population.Increased tillering rate in seedlings led to higher turf tiller densities. Stolon internode length was negatively related to turf tiller density. A positive relationship was found between seedling stolon internode length and internode lengths found under turf conditions. Seedling selection may be used to reduce selection cycle duration where tillering characteristics are of interest.Seeding rate was found to influence the rate of turf development. Lower seeding rates led to an increase in tillers plant -1, larger plant weight and better wear stress resistance potential. Wear stress resistance potential of turf appeared to have equilibrated at 9-12 weeks after seeding.Tiller density increased with turf age up to three years after seeding. Cultivar differences were consistent over time. Within year fluctuation in tiller density was found. Above ground biomass accumulation increased with

Agrostis stolonifera is a polyploid complex in which clonal propagation is predominant. Polyploidization often results in the induction of chromosomal aberrations at the mitotic and/or meiotic level. We observed that variation in ploidy level was present in Agrostis stolonifera, and that variation in chromosome number within genotypes also occurred. Populations differed in the degree of variation observed. Analysis of the frequency distribution of chromosome numbers per cell among different populations showed a wide range of variation in the inland meadow population, an intermediate level in the polder and salt marsh populations, and a very low level in the sand dune population. The results are discussed in the context of the origin of somatic chromosome number variation.

Tiller populations of three grass species, Agrostis stolonifera, Festuca rubra and Poa irrigata (= Poa pratensis ssp. irrigata), were studied for 5 years on a Baltic seashore meadow in Sweden. No significant relationships were found between the death rate of tillers and tiller density in any of the species. The birth rate of F. rubra tillers was negatively related to their density. An increase in death rate of F. rubra tillers lead to an increase in their birth rate. The frequency of flowering in F. rubra was negatively related to its density. Negative relationships were found between spring termperature and the death rates of F. rubra and P. irrigata tillers. The birth rates of tillers of all species were positively related to summer precipitation.