Navigation Links
Shade trees getting 'scorched' by plant disease

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/.


'"/>

Source:American Phytopathological Society


Related biology news :

1. Poplar trees redirect resources in response to simulated attack
2. Family trees of ancient bacteria reveal evolutionary moves
3. Alien woodwasp, threat to US pine trees, found in N.Y.
4. Seeing the forest and the trees
5. Why Christmas trees are not extinct
6. Amazon trees much older than assumed, raising questions on global climate impact of region
7. Underdogs in the understory: Study suggests nature favors rarer trees
8. Of mice, men, trees and the global carbon cycle
9. Genome info from plant destroyers could save trees, beans and chocolate
10. Mystery of fossilized trees is solved
11. How trees manage water in arid environments
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/30/2017)... March 30, 2017 The research team of ... three-dimensional (3D) fingerprint identification by adopting ground breaking 3D fingerprint minutiae ... realm of speed and accuracy for use in identification, crime investigation, ... cost. ... A research ...
(Date:3/28/2017)... -- The report "Video Surveillance Market by ... Devices), Software (Video Analytics, VMS), and Service (VSaaS, Installation ... 2022", published by MarketsandMarkets, the market was valued at ... reach USD 75.64 Billion by 2022, at a CAGR ... considered for the study is 2016 and the forecast ...
(Date:3/24/2017)... Research and Markets has announced the addition of the ... Industry Forecast to 2025" report to their offering. ... The Global Biometric Vehicle Access ... 15.1% over the next decade to reach approximately $1,580 million by ... and forecasts for all the given segments on global as well ...
Breaking Biology News(10 mins):
(Date:4/20/2017)... (PRWEB) , ... April 20, 2017 , ... ... light sources for advanced technology applications, announced today that Chief Executive Officer (CEO) ... , SEMI is the global industry association connecting the electronics manufacturing ...
(Date:4/20/2017)... Minneapolis, MN and Bethesda, MD (PRWEB) , ... ... ... for Advancing Innovation announce the formation of a unique intellectual property (IP) sharing ... commercialization potential of their most promising inventions. A main component of this effort ...
(Date:4/20/2017)... PETACH TIKVAH, Israel , April 20, 2017 ... of adult stem cell technologies for neurodegenerative diseases, announced today ... at the Alliance for Regenerative Medicine,s (ARM) 5 th ... 27, 2017 at 09:40 EDT in Boston ... MD, MHSc, Chief Medical Officer & Chief Operating Officer, will ...
(Date:4/19/2017)... ... April 18, 2017 , ... ... been a key device for generating monodisperse droplets of known diameters for research ... for generating monodisperse solid particles by drying monodisperse droplets. , The VOAG ...
Breaking Biology Technology: