The cause of the dieback is still under investigation, but U.S. Forest Service researchers suspect the shortage of rain this year, after several rainy winters that encouraged wild brush to grow beyond its ability to survive in a dry year.
Starting today here in Gomel, Belarus, an FAO-organized expert meeting is about to look closer at the problem and validate the primary causes of pine dieback, with a focus on early detection and pest management.
Sudden oak death can kill small madrones and cause significant dieback of larger madrones.
The world has committed to keeping warming to no more than 2C above such levels, with an aspiration to limit rises to 1.5C, which the Intergovernmental Panel on Climate Change (IPCC) has said will cause the dieback of coral reefs, sea-level rises and extreme weather in many regions.
The disease is characterized by distinct necrotic spots on leaves, stems and petioles that eventually expand and cause a dieback of apical tissues.
The sores often surround branches in the infected area of the tree, causing the dieback of shoots, twigs, branches and smaller stems.
These beetles, in concert with other defoliating insects, have caused widespread dieback of pasture eucalypts, and continue to hamper establishment of eucalypts in intensively developed pasture land.
The UC researchers say it is unclear what caused the dieback of a mature redwood tree in Mill Valley, widely reported earlier this year as having been infected by P. ramorum.
The temporal uniformity of dieback suggested that a single inundation event caused the trees to drown.
Widely distributed in southern Australia, the fungus is responsible for a disease known as Armillaria root rot, a primary cause of Eucalyptus tree death and forest dieback.
