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15351 |
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Date: August 17, 2018 at 16:59:05
From: pamela, [DNS_Address]
Subject: The Torrey Pine Tree Die off, Why they need to be analyzed |
URL: https://youtu.be/WYdpaq3Jt-Q |
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The Torrey Pine Tree Die off, Why they need to be analyzed
Published on Aug 14, 2018
Subscribe 4 This video provides an overview of the Torrey Pine die-off as of 2018, explains that the official story of drought and beetles is oversimplified, and shows how fungal damage and aluminum poisoning are involved.
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Date: August 18, 2018 at 01:47:53
From: Alan, [DNS_Address]
Subject: Re: The Torrey Pine Tree Die off, Why they need to be analyzed |
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Pine bark beetles are getting the blame. But according to Ron Matranga, Master Arborist for Atlas Tree Service, they are simply opportunists. Lack of rainfall set the process in motion.
“It is my opinion that the extended drought of the early 2010’s has led to stress to pine trees in landscaped areas. PBB is typically a secondary issue that exploits a stressed host. All pines are susceptible, but most of our PBB problems are currently with Monterey and Torrey pine, with Aleppo, Canary Island, and Italian stone pines also seeing attacks.”
https://pointloma.org/dying-pines/
http://www.delmar.ca.us/DocumentCenter/View/2258/Tree-age-Label?bidId=
Torrey pine forest is an open to moderately dense forest dominated by the Torrey pine, Pinus torreyana, and by Quercus dumosa, Cneoidium dumosum, and Eriogonum fasciculatum . Fog may provide moisture to the forest throughout the year, but is less common in winter and late spring. Most growth and flowering occurs during the rainy season in late winter and spring, but growth may occur outside of those seasons at more mesic sites. The canopy is open with trees less than 15 meters tall. There are 3 MSP species associated with Torrey pine forest vegetation.
Threats
Very few seedlings survive to reproductive age, with water stress in July and August the leading cause of mortality, highlighting the sensitivity of seedlings to drought and drier conditions. Additionally, due to low genetic variability, Torrey pines have little ability to respond to change through natural selection. Another threat to the Torrey pines is air pollution due to the proximity to densely populated San Diego. A bark beetle infestation in the late 1980s-early 1990s killed 12% of adult Torrey pines. This infestation was controlled with the placement of synthetic pheromones in traps to attract and capture the beetles. The recent prolonged drought has led to a resurgence in 2014-2016 of bark-beetle caused mortality and current management includes cutting down and removing infested trees, watering trees, and trapping to remove beetles.
https://sdmmp.com/veg_community_profile.php?taxaid=SDMMP_vegcom_8
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