Overstory, shrub-layer, and herbllayer flora composition and abundance patterns in eleven forest sites were studied to evaluate species diversity and richness before implementing three types of harvest treatments. The sites were within the Wine Spring Creek Watershed and were classified as high elevation, dry, Quercus rubra-Rhododendron calendulaceum based on McNab and Browning’s Landscape Ecos...

Plant extracts, made by grinding 2 g of fresh tissue in 5 ml of water, were toxic to Tylenchorhynchus dubius and Hoplolaimus spp. Such extracts from leaves and stems of bean (Phaseolus vulgaris L.) and leaves of tobacco (Nicotiana tabacum L.) were most toxic; those from leaves of corn (Zea mays L.), tomato (Lycopersicon esculentum Mill.) and rhododendron (Rhododendron catawbiense L.) were less ...

Foliar hosts of Phytophthora ramorum are often susceptible to root infection but the epidemiological significance of such infections is unknown. A standardized test system was developed to quantify inoculum in runoff from root-infected Viburnum tinus ?Spring Bouquet? or Rhododendron ?Cunningham's White? cuttings. Cuttings of both species gave off a maximum amount of inoculum 1 to 3 weeks after ...

Rhododendron arboreum is an evergreen shrub or small tree with a showy display of bright red flowers. Rhododendron is the national flower of Nepal and is known as (Laligurans) & the state tree of Uttarakhand. It is called ‘Burans, Bras, Buras or Barahkephool’ in local dialect. Rhododendron arboreum is a wild plant species possesses high ecological importance and the flower of the species having...

Caribou (Rangifer tarandus) rely on the short Arctic growing season to restore body condition, support demands of lactation, and prepare for long arctic winter, making them susceptible even small changes in forage availability or quality. Body condition summer autumn is linked winter survival rates fecundity cows, critical factors productivity caribou populations. Climate change predictions war...

The most important hosts of Phytophthora ramorum in Europe are cultivated Rhododendron species and hybrids. Since November 2002, EU emergency phytosanitary measures are being taken to prevent the introduction and spread of P. ramorum in Europe. Surveys at all commercial Rhododendron-growing premises are part of these measures and have led to P. ramorum findings at 2 to 5% of the inspected sites...

Rhododendron delavayi Franch. is globally famous as an ornamental plant. Its distribution in southwest China covers several different habitats and environments. However, not much research had been conducted on Rhododendron spp. at the molecular level, which hinders understanding of its evolution, speciation, and synthesis of secondary metabolites, as well as its wide adaptability to different e...

The diversity of Phytophthora spp. in rivers and riparian ecosystems has received considerable international attention, although little such research has been conducted in South Africa. This study determined the diversity of Phytophthora spp. within a single river in Gauteng province of South Africa. Samples were collected over 1 y including biweekly river baiting with Rhododendron indicum leav...

Rhododendron, one of the most famous ornamental plants in the world, is traditionally a medicinal plant. However, the potential bioactivities of native Rhododendron in Taiwan have not been completely studied. In this study, the results revealed that Rhododendron pseudochrysanthum exhibited the best antioxidant activities among 10 native Rhododendron species in Taiwan. Furthermore, based on a bi...

There is widespread concern among scientists and land managers that Phytophthora ramorum may be accidentally introduced into oak-dominated eastern U.S. forests through the transfer of the pathogen from infected nursery plants to susceptible understory forest species (for example, Rhododendron spp.) at the forest-urban interface. Inspection programs can be made more efficient by identifying loca...