Progressive diebacks of outer canopy branchlets of Ceanothus crassifolius were repeatedly observed after rainless periods up to 9 mo in duration in the Santa Monica Mountains of southern California. Mean xylem pressures of branchlets near the end of drought were as low as -11.2 MPa (N = 22) with a mean of about 60 dead branchlets per shrub. Inoculation (N = 15) with three species of fungi previ...

Abies sibirica Ledeb.-dominated stands degradation is of special concern. Nevertheless, insufficient attention paid to the role pathogens in this process. The aim present study assess coenotic infectious diseases fir-dominated south Central Siberia. research was based on a forest pathological examination conducted A. sibirica-dominated Krasnoyarsk Krai. cenotic identified unequal. Stem decay an...

The current increase of severe droughts associated with climate change is one the main causes observed dieback in Mediterranean holm-oak ( Quercus Ilex subs ballota ) forests. Effects forest soils are greatly variable and depend on a number local factors, but generally include increased soil organic C due to litter inputs, alterations nutrient contents, changes nitrogen cycle, detrimental effec...

Abstract The complete or partial collapse of the forests Amazonia is consistently named as one top ten possible tipping points Planet Earth in a changing climate. However, apart from few observational studies that showed increased mortality after severe droughts 2005 and 2010, evidence for such depends primarily on modelling. Such are notoriously deficient at predicting rainfall Amazon basin ho...

In Lithuania, the dieback of European ash (Fraxinus excelsior L.), caused by alien ascomycete Hymenoscyphus fraxineus, started in mid-1990s, resulting a large-scale decline F. and its dominated forest habitats. Nevertheless, recent inventories show presence several hundred hectares naturally regenerated stands. We used seven sites three planted progeny trials to collect leaves, shoots, roots, s...

Biological invasions, resulting from deliberate and unintentional species transfers of insects, fungal and oomycete organisms, are a major consequence of globalization and pose a significant threat to biodiversity. Limiting damage by non-indigenous forest pathogens requires an understanding of their current and potential distributions, factors affecting disease spread, and development of approp...