Ribes Alpinum Research Articles

Place des haies du bocage du Bas—Berry (lndre) et de Ia Marche (Creuse) dans le synsystéme phytosociologique

summary The authors describe three vegetal groupments within the hedged areas of Low Berry and Marche: first, a Carpino-Prunetum spinosae and a Lonicero-Rubetum ulmifolii, in a comparative study with similar groupments from other regions; then, an apparently original groupment with Ribes alpinum for which the name of Euonymo-Ribetum alpini is proposed.

WATER REQUIREMENTS OF WOODY LANDSCAPE SHRUBS

Four woody plant species were grown during the 1988 and 1989 growing seasons under three irrigation treatments at two sites in two soil types. The three irrigation treatments which were implemented included: 1) control, 2) drip irrigated with no water stress, and 3) drip irrigated with water stress. Rainfall and additional water applied during the 1988 and '89 growing seasons were recorded. Analysis of this data showed the no stress treatment receiving more water at both sites, especially in 1989. After two years of growth, no statistical differences in new growth (height) were observed with any plant species evaluated at either site from the three water treatments. Comparing new growth, no statistical differences were observed except with Juniperus sabina. No visual differences were observed with Ribes alpinum and Cornus sericea. Visual differences were observed with Potentilla fruticosa and Juniperus sabina. The experiment will be continued during the 1990 growing season.

Blister rust in Romania

AbstractIn a survey of the incidence of Cronartium ribicola in Romania, this parasite was found to be present all over the country, except in mountain regions.The heaviest attacks occurred in Ribes nigrum and in young plantations of Pinus strobus, whereas old plantations of P. strobus and other pine species were free from blister rust, as were natural populations of Pinus cembra, Ribes alpinum, and R. petraeum in the Carpathians.

The genus Eriosoma Leach in Sweden, with descriptions of two new species: Studies on Eriosomatidae I (Homoptera, Aphidoidea)

AbstractThe species of the genus Eriosoma Leach found in Sweden are described and figured, including two new species. Eriosoma (Schizoneura) anncharlotteae n.sp. causes curling of the leaves of Ulmus carpinifolia and U. procera and the secondary host is Ribes alpinum. E.(S.) sorbiradicis n.sp. has only been found on the roots of the secondary host, Sorbus aucuparia. Keys are given to emigrants, apterous exules and sexuparae.