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Search Results for ' Abies'
PAL Questions: 3 - Garden Tools: 1
Can I attempt to diagnose a diseased tree online? We're getting more brown spots on our grand fir and I would like to try to figure out what is wrong.
You can attempt it, but you will not know for certain based solely on a comparison of symptoms. You can certainly get an idea of what the potential problems could be. Try the Pacific Northwest Disease Management Handbook online---it has excellent photos. Search for fir.
There are several possibilities with brown spots as symptoms, especially:
*needle casts (there are 3 kinds)
*current season needle necrosis
*interior needle blight
The best way to diagnose a problem is to bring photos of the affected tree along with samples (if you can reach them) to your local county extension agent or Master Gardener diagnostic clinic.
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I would like to remove a burl from one of my fir trees. Can I do this without causing harm to the tree?
I was unable to find any information on the incidence of burls (lignotubers) on fir trees (Abies), but I did locate information about redwood (Sequoia sempervirens) burls from a version of The Sempervirens Fund website which is no longer available:
About Redwood Burl
by Chris Brinegar, PhD
"The swollen tissue at the base of some redwood trees is commonly known as a "burl" although scientifically it is referred to as a lignotuber (from the Latin for "woody swelling"). All redwoods have lignotuber tissue but not all have large visible burls. Lignotuber tissue is derived from cells that exist in the tree's seedling stage and then proliferate near the base of the tree as it ages. Buds form within the woody burl and remain dormant until stimulated to grow by damage to the main trunk (usually by fire or logging). The resulting shoots grow rapidly using carbohydrates stored in the surrounding cells and minerals transported through the parent tree's root system. Lignotubers can also form their own roots.
Lignotubers are responsible for vegetative (clonal) reproduction common in redwoods. Without this mode of propagation, the redwood forest would appear far different than it does currently. The second and third-growth redwoods in our coastal forests were generated vegetatively after 19th and 20th century logging of the original forests. If redwoods were solely dependent on reproduction from seed, their numbers would only be a small fraction of what we see today.
Most people think of burl as the "sliced redwood" sold in gift shops and roadside stands, but they do not realize that many of these burls were obtained illegally. There is a growing black market for burl with much of it coming from unscrupulous dealers who harvest it from healthy redwoods on protected forestland. In some cases, removing burl can kill a tree or, at the very least, deface it and reduce its reproductive potential.
Burls can be planted under the appropriate conditions to allow the shoots to form roots and then grow into trees, but the typical buyer of a redwood burl places it in water, watches the shoots grow, then disposes of it after the shoots die from lack of nutrients. If you are determined to grow a redwood tree we suggest that you purchase a small seed-derived tree from a reputable nursery rather than trying to grow one from a burl that may have been acquired through questionable methods."
According to the information here, it seems that by removing a burl, you may risk harming or killing the tree. You might want to contact a certified arborist in your area, and ask them what they recommend. Here is a link to the website of the Pacific Northwest chapter of the International Society of Arboriculture, where you can find lists of certified arborists.
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We planted a young Fraser fir last March. It has a lot of new growth, but has developed some dead-looking tips here and there that are a reddish rust color. I am wondering if we have a serious problem or should I just remove the affected tips and not worry about it? I have noticed a lot of trees this summer on my travels out through the Cumberland-Enumclaw area that look a similar cinnamon color and are totally dead!
The problem you describe could be the result of drought injury, or it could be one of several rust and fungal diseases which affect fir trees. Was the tree watered well after planting? Here is information on drought injury, from Oregon State University's plant disease database (no longer available online). Excerpt:
Drought injury usually progresses from the top of the tree downward and from the outside to the inside of the crown. Top dieback and branch death may be common. Defoliation of the mid-crown or loss of needles at the base and tip of shoots can also occur in Douglas-fir. Older needles commonly turn yellow and are shed prematurely. Roots may be alive even though the entire above-ground parts are dead. Winter injury, gopher and root weevil problems can produce similar symptoms.
Your description also sounds like the symptoms of Phytophthora, a fungal disease which is common in our area. (search under "Common plant diseases") Excerpt:
Phytophthora root rot is usually a problem only in areas with poor drainage or where flooding occurs. The fungus attacks the roots, which rot and die. The infection moves up into the crown, where the cambium (soft inner bark) turns reddish-brown or caramel in color instead of the normal white to greenish color. Older trees may develop cankers on the trunk, which are a dark reddish-brown when cut. The cankers may be accompanied by split bark and oozing pitch. Lower branches wilt, turn dark red, and die back. Younger trees are often killed outright, while infected mature trees may show wilting, branch dieback, and/or gradual decline.
Missouri Botanical Garden's Integrated Pest Management site has information and includes an image of Fraser fir suffering from Phytophthora.
The Connecticut Agricultural Experiment Station has published a guide entitled "Recognizing and Managing Phytophthora Root Rot and Other Conifer Diseases" which may be of use to you. (Caution: this is a large file!)
I recommend taking a sample of one of the cinnamon-colored branches to a Master Gardener Clinic, and also taking photos of the whole tree, so that you can have the problem diagnosed. If you are near Enumclaw, the Pierce County Master Gardeners offer diagnostic clinics.
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The Pacific Northwest is an excellent climate for growing evergreens because our winters are generally mild. We can grow far more species than just Douglas Firs and Red Cedars, and in city gardens dwarf conifers are much more suitable. Explore the wide world of conifers, plants that produce cones, by joining the American Conifer Society. Membership costs $25 per year which includes a nice quarterly journal with color photos. Their website has a database with descriptions and photos, as well as information on becoming a member. Call (410) 721-6611 to join.
Favorite four conifers as voted on by members of the American Conifer Society:
- Picea orientalis 'Skylands'
- Abies koreana 'Silberlocke'
- Tsuga canadensis
- Chamaecyparis obtusa 'Nana Lutea'
Season: All Season
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December 12 2014 11:33:49