Unasylva 231/232, Vol. 60, 2009 Forests, which today cover 30 percent of the world’s land surface (FAO, 2006), are being rapidly and directly transformed in many areas by the impacts of expanding human populations and economies. Less evident are the pervasive effects of ongoing climatic changes on the condition and status of forests around the world. Recent examples of drought and heat-related ...

Remote sensing of vegetation condition using high resolution digital multispectral imagery (DMSI) is an option for land managers interested in quantifying the distribution and extent of dieback in native forest. Crown condition is assessed as reference to the physical structure and foliage (i.e. density, transparency, extent and in-crown distribution) of a tree crown. At 20 sites in the Yalgoru...

A disjunct population of red stringybark (Eucalyptus macrorhyncha) trees in South Australia is experiencing increasing amounts dieback. Because the considered vulnerable to extinction, we investigated spatiotemporal vegetation changes, quantified extent dieback, and determined how topography influences dieback using aerial satellite imagery. Classification health status hyperspectral imagery in...

For nearly two decades, the American Southwest has been in grips of a long-term ‘megadrought’, punctuated by number short and severe ‘global change type droughts’ (i.e., negative precipitation anomalies co-occurring with high temperature). These events have caused widespread mortality drought-sensitive piñon pine (Pinus edulis) while co-dominant Juniperus spp. historically much more drought tol...

In California's Mediterranean climate, management of grapevine trunk diseases (Botryosphaeria dieback, Eutypa Phomopsis Esca) focuses on protecting vines during the dormant season, when pruning coincides with rain-induced spore dispersal causal fungi (‘trunk pathogens’). Applying protectants (fungicides, toxic barriers, sealants, biocontrol agents) after can minimize infection wounds. For seaso...

Abstract American sycamores ( Platanus occidentalis L.) are found in many ecosystems and planted urban landscapes worldwide. The trees highly susceptible to anthracnose canker pathogens, causing leaf blight branch dieback. On Ohio State University campus Columbus, Ohio, an sycamore was observed thrive among symptomatic sycamores. healthy tree, subsequently protected as cultivar ‘Davis,’ vegetat...

Under the rules for the naming of fungi with pleomorphic life-cycles adopted in July 2011, the nomenclaturally correct name for the fungus causing the current ash dieback in Europe is determined to be Hymenoscyphus fraxineus, with the basionym Chalara fraxinea, and Hymenoscyphus pseudoalbidus as a taxonomic synonym of H. fraxineus.

Here, we report the genome of Fusarium euwallaceae strain HFEW-16-IV-019, an isolate obtained from Kuroshio shot hole borer (a Euwallacea sp.). These beetles were collected in Tijuana, Mexico, from elm trees showing typical symptoms of Fusarium dieback. The final assembly consists of 287 scaffolds spanning 48,274,071 bp and 13,777 genes.

during 2004-2007, a field survey was conducted in different vineyards to determine the fungal pathogens associated with grapevine decline in different provinces of iran including fars,hamedan,isfahan, and kohgiluyeh and boirahmad. twenty-seven isolates of botryosphaeriaceae were recovered from vines showing decline and dieback symptoms only in fars province. based on morphological and cultural ...