Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Shade trees getting ’scorched’ by plant disease

29.11.2005


Bacterial leaf scorch is severely affecting urban shade trees grown not only to provide shade, but to help clear the air, reduce noise, and improve the aesthetics in many U.S. communities, say plant pathologists with The American Phytopathological Society (APS).



According to Ann Brooks Gould, associate extension specialist at Rutgers University, New Brunswick, NJ, bacterial leaf scorch (BLS) affects many shade tree species such as American elm, red maple, sweet gum, sycamore and London plane, and a number of oak species. The disease has been found in landscapes, street plantings, and small woodlots throughout the eastern U.S. and as far west as Texas.

According to Gould, BLS affects as many as 35 percent of susceptible street and landscape oaks in some central New Jersey communities. Current loss of value plus replacement costs for older trees affected by this disease is estimated at $8,000 per tree. Landowners and tree care professionals in these locations must plan for the loss of property values and high costs of replacement as shade trees in landscapes, wood lots, and golf courses affected by BLS decline and must be removed.


BLS is caused by a bacterial pathogen, Xylella fastidiosa, which has a wide host range that includes common landscape ornamentals and weeds. X. fastidiosa is spread by insects, mainly sharpshooters.

Symptoms of BLS are very similar to those caused by environmental stresses. Because of this, the disease is often overlooked or misdiagnosed. On oak trees, BLS symptoms include scorching in late summer or early fall on leaves of all ages at about the same time. On sycamores and elms, symptoms progress from older to younger leaves. Affected leaves may curl and drop prematurely, and as the disease progresses, branches die and the tree declines. Elms may be killed outright by the disease. Other affected species eventually decline to the point where the dead branches pose a safety risk and the tree must be removed.

According to Gould, current management options of BLS in urban trees include:

  • Maintain plant vigor. The development of BLS is enhanced by other diseases, insects, and environmental stresses such as drought. BLS may also predispose infected plants to other disease and insect problems.
  • Practice sanitation. Branches that have died due to BLS should be routinely removed. Infected trees that are in a severe state of decline should also be removed.
  • Use tolerant plants. In areas where BLS occurs, avoid planting highly susceptible trees, and design new tree plantings with a diverse complement of tree species.

More on the symptoms of BLS and disease management options is available in this month’s APSnet feature article at http://www.apsnet.org/online/feature/bls/.

Amy Steigman | EurekAlert!
Further information:
http://www.scisoc.org
http://www.apsnet.org/online/feature/bls/

More articles from Life Sciences:

nachricht Designer cells: artificial enzyme can activate a gene switch
22.05.2018 | Universität Basel

nachricht Flow of cerebrospinal fluid regulates neural stem cell division
22.05.2018 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Spinning rugby balls: The rotation of the most massive galaxies

23.05.2018 | Physics and Astronomy

Raiding the rape field

23.05.2018 | Agricultural and Forestry Science

Turning entanglement upside down

23.05.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>