The condition of tree crowns is an important indicator of tree and forest health. Crown conditions have been evaluated during inventories of the US Forest Service Forest Inventory and Analysis (FIA) program since 1999. In this study, remeasured data from 55,013 trees on 2616 FIA plots in the eastern USA were used to assess the probability of survival among various tree species using the suite o...

Describing a recent drought-related forest dieback event in southwestern Australia in 2011 (Matusick 2012), a colleague remarked upon the distinctive sounds of wood boring beetles feeding on weakened eucalypt trees during one of the most severe droughts on record (K. Ruthrof, personal communication). For this insect population, normally scarce and benign, drought stress had most likely triggere...

Given the multifunctional role of forests, there is an urgent need in forming biologically stable and productive tree stands to obtain maximum ecological economic effect for Ukraine present-day conditions. Therefore, studies species composition, spread, pathogenic action, harmful effects pathogens infectious diseases main forestforming Zhytomyr Polissia allow designing a real phytosanitary situ...

The phenomenon of patch dieback in stands of Nothofagus on Mt. Giluwe, in the southern highlands of Papua New Guinea, is described. Ecological studies that have been carried out are reviewed. Based upon the results of surveys on Mt. Giluwe, the role of Phytophthora cinnamomi in contributing to the dieback is examined. A comparison is made of Nothofagus dieback on Mt. Giluwe with Metrosideros di...

A major dieback of seagrass occurred in South Australia where 12,717 ha of intertidal and shallow subtidal seagrasses were lost along the north eastern coast of Spencer Gulf. This was a rapid decline, occurring toward the end of summer in January or early February of 1993. The extent and location of the dieback was mapped from aerial photographs taken before (1987) and after the event (1994). E...

Stems or roots + stems of potted, 2-year-old paper birch (Betula papyrifera L.) were subjected to simulated winter thaws of various durations in climate-controlled chambers. The simulated thaws induced dieback of shoots of the treated plants. Although the stem thaw treatment did not significantly increase dieback, there were significant (P < 0.05) correlations between growing degree days above ...

brown leaf spots; or diffuse yellow blotches. Severely affected plants have rotten basal stems and stumps and black, rotten roots. Symptoms of ‘awa dieback may resemble other ‘awa diseases or conditions. The mosaic symptoms associated with ‘awa dieback resemble nutrient deficiencies (e.g., nitrogen, potassium, and iron) caused by insufficient fertilizer applications or planting in a nutrient-po...