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Tag: Tree

Olive tree killer disease still poses risk to Europe

Olive tree killer disease still poses risk to Europe

Science
Southern Europe countries are said to be at the greatest risk from a deadly disease described as a "very serious threat" to the EU's olive industry.The European Food Safety Authority (ESFA) says computer modelling has helped understand how it spreads, but there is no cure for infected plants.Experts describe Xylella as one of the "most dangerous pathogens worldwide".It was first recorded in Italy in 2013, and has since spread to other European nations.Olive killer disease reaches Spain"One of the problems of Xylella is that is a bit of a silent spreader," explained Dr Stephen Parnell from the University of Salford and chairman of the EFSA's working group on Xylella fastidiosa pest risk assessment."You can have different lengths ...
Oklahoma City bombing ‘Survivor Tree’ DNA to live on

Oklahoma City bombing ‘Survivor Tree’ DNA to live on

Technology
Science and technology are helping Oklahoma City to sustain the DNA — and the spirit — of a tree that has symbolized hope in the 24 years since the deadliest act of domestic terrorism in U.S. history shook the city to its core. As part of an annual remembrance of the bombing, civic leaders and state officials on Friday transplanted a tree that was cloned from a scarred American elm that lived through the blast that leveled half of the Alfred P. Murrah Federal Building on April 19, 1995. The "Survivor Tree" features prominently at the Oklahoma City National Memorial, overlooking 168 chairs that represent those killed. The intent of the DNA work is that the younger elm will replace the nearly 100-year-old "Survivor Tree" after it eventually dies. "While we hope that tree li
UK scientists discover world’s tallest tropical tree

UK scientists discover world’s tallest tropical tree

Science
Scientists in the UK and Malaysia say they have discovered the world's tallest tropical tree measuring more than 100m (328ft) high. The lofty yellow meranti was spotted in a Borneo rainforest by a team from the University of Nottingham last year. Researchers from the University of Oxford then carried out 3D scans and drone flights to confirm the record. The tree, found in the Danum Valley Conservation Area in Sabah, has been named Menara, which is Malay for tower.Local climber Unding Jami, who scaled the tree with a measuring tape, said it was a "scary and windy" ascent."But honestly the view from the top was incredible. I don't know what to say other than it was very, very, very amazing," he added. ...
Tree rings help researchers understand drought intolerance

Tree rings help researchers understand drought intolerance

Science
Dec. 26 (UPI) -- Tree rings are giving scientists answers for how fire suppression has increased forest density and reduced their tolerances for droughts and wildfires, a study says. Researchers at Oregon State University and Utah State University analyzed 2,800 hectares of mixed-conifer forest in central Oregon. Some of the ponderosa pines have inhabited the study area since before 1910 -- that's around the time when putting out forest fires became federal law. "We wanted to document the trajectory of sensitivity to drought stress in response to progressively increasing fire deficits, and the threshold level of stand occupancy where decreasing resistance and resilience to drought stress, bark beetles and wildfire set in," Christopher Still, a researcher at OSU College of Forestry and stu...
Tree rings helped scientists date ancient Greek eruption

Tree rings helped scientists date ancient Greek eruption

Science
Aug. 17 (UPI) -- Tree ring analysis has helped scientists pinpoint the date of Thera's eruption. The volcano on the Greek island of Santorini erupted sometime during the 15th or 16th century BC, but scientists have previously been frustrated by discrepancies between radiocarbon and archaeological evidence of the ancient eruption's precise timing. "It's about tying together a timeline of ancient Egypt, Greece, Turkey and the rest of the Mediterranean at this critical point in the ancient world -- that's what dating Thera can do," Charlotte Pearson, an assistant professor of dendrochronology at the University of Arizona, said in a news release. The latest findings, analysis of carbon in tree rings traced to the time of the eruption, have revealed an agreement, or overlap, between the timeli...