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#1
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Black Spots Turning Live Oak Leaves Brown
With all the rain we had in the late spring/early summer, my live oaks have
gone bananas, putting on all kinds of new growth. However, with this hot spell we got last week, all of a sudden I started noticing something strange on a few of them. The leaves are starting to turn brown. This seemed like it happened almost overnight. About half the leaves on an afflicted tree are browning, but I suspect they will all end up turning brown and falling off before it's all said and done. Closer inspection shows black spots on the leaves... on the green ones even before they start turning brown. My guess is it's some kind of mold or fungus related to the extra wet conditions. Here are a couple photos: http://www.employees.org/~harper/leaves/P8160009.JPG http://www.employees.org/~harper/leaves/P8160011.JPG Is this anything to be concerned about? If so, is there anything that can be done to stop it? On a related note, I have a few end tips of branches that are turning brown as well. But they don't have the black spots on them. When you look at them, the branch looks like it has been damaged, enough so to kill it off. It almost looks to me like it got so much water that it grew to fast and ruptured itself. I suppose it could be birds or squirrels doing the damage though. These are few and far between, so I'm not too concerned about them... mostly just curious. Here's a picture of one of these: http://www.employees.org/~harper/leaves/P8160012.JPG scott |
#2
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Black Spots Turning Live Oak Leaves Brown
"Scott Harper" wrote in message
io.net... With all the rain we had in the late spring/early summer, my live oaks have gone bananas, putting on all kinds of new growth. However, with this hot spell we got last week, all of a sudden I started noticing something strange on a few of them. The leaves are starting to turn brown. This seemed like it happened almost overnight. About half the leaves on an afflicted tree are browning, but I suspect they will all end up turning brown and falling off before it's all said and done. Closer inspection shows black spots on the leaves... on the green ones even before they start turning brown. My guess is it's some kind of mold or fungus related to the extra wet conditions. Here are a couple photos: http://www.employees.org/~harper/leaves/P8160009.JPG http://www.employees.org/~harper/leaves/P8160011.JPG Is this anything to be concerned about? If so, is there anything that can be done to stop it? On a related note, I have a few end tips of branches that are turning brown as well. But they don't have the black spots on them. When you look at them, the branch looks like it has been damaged, enough so to kill it off. It almost looks to me like it got so much water that it grew to fast and ruptured itself. I suppose it could be birds or squirrels doing the damage though. These are few and far between, so I'm not too concerned about them... mostly just curious. Here's a picture of one of these: http://www.employees.org/~harper/leaves/P8160012.JPG scott Its not just your live oaks, its most in Texas area doing the banana thing with branching and leaf growth. Your guess is right on. Its a fungus, Morenoella quercina. And, as you guessed, is due to too much long term rain. If its widespread and there's neighboring oaks with same problem not on your property, you probably have to let it run its course. Can be treated with general fungicide if localized. Improve air circulation by pruning. Keep the dead leaves picked up, and burn em. The branch problem that I perceive on the upper canopy is what I believe to be oak decline. If you're in a new home, could be root injury as one cause. Oak decline is a sign of a stressed tree. More common in drought conditions. Cut the dead limbs off the tree. No, I don't claim to be an arborist. Dave |
#3
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Black Spots Turning Live Oak Leaves Brown
Scott Harper wrote:
With all the rain we had in the late spring/early summer, my live oaks have gone bananas, putting on all kinds of new growth. However, with this hot spell we got last week, all of a sudden I started noticing something strange on a few of them. The leaves are starting to turn brown. This seemed like it happened almost overnight. About half the leaves on an afflicted tree are browning, but I suspect they will all end up turning brown and falling off before it's all said and done. Closer inspection shows black spots on the leaves... on the green ones even before they start turning brown. My guess is it's some kind of mold or fungus related to the extra wet conditions. Here are a couple photos: http://www.employees.org/~harper/leaves/P8160009.JPG http://www.employees.org/~harper/leaves/P8160011.JPG Is this anything to be concerned about? If so, is there anything that can be done to stop it? On a related note, I have a few end tips of branches that are turning brown as well. But they don't have the black spots on them. When you look at them, the branch looks like it has been damaged, enough so to kill it off. It almost looks to me like it got so much water that it grew to fast and ruptured itself. I suppose it could be birds or squirrels doing the damage though. These are few and far between, so I'm not too concerned about them... mostly just curious. Here's a picture of one of these: http://www.employees.org/~harper/leaves/P8160012.JPG scott check this out http://www.wildflower.org/expert/show.php?id=1540 |
#4
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Black Spots Turning Live Oak Leaves Brown
In article , wrote:
check this out http://www.wildflower.org/expert/show.php?id=1540 That's encouraging to hear, and is about what I suspected... however, none of the specific diseases he references (from the pictures in the link to his article) are what I'm seeing. I am pretty sure it's not oak wilt though... scott |
#5
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Black Spots Turning Live Oak Leaves Brown
Scott Harper wrote:
In article , wrote: check this out http://www.wildflower.org/expert/show.php?id=1540 That's encouraging to hear, and is about what I suspected... however, none of the specific diseases he references (from the pictures in the link to his article) are what I'm seeing. I am pretty sure it's not oak wilt though... scott Every time we had a bunch of summer rain there are numerous posts about oak branch tips browning out and littering the yard. The article's comment about only and inch or two of twig/branch being affected seemed too conservative from my observations. I'm seeing it on my backyard live oaks and some places it's several inches. Since we've lived here for +20 years and have seen this about 4-5 times without any permanent tree damage I'm not losing any sleep over it. My main complaint to it is the darn things pretty much end up in my pool :-( Your question did help out my neighbor. They've had an oak suffering from actinopelte dpp for years and when I saw the pics in that article it was woohoo! |
#6
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Black Spots Turning Live Oak Leaves Brown
Hi Scott,
I live in the same city as you based on your email address. I have exactly the same black leaf spot on my leaves as you. I am curious if you called the County Extension office to have an arborist ID your black spots as Morenoella quercina? The Department of Plant Pathology & Microbiology at Texas A & M University calls it Tar Spot (layman for Morenoella quercina) at http://plantpathology.tamu.edu/Texlab/Trees/tree4.html (see the last paragraph). The advice is the same as Dave's below, to prune low hanging branches to improve circulation. After reading that I noticed that only the lower leaves were affected, not the upper leaves. None of my neighbors have the black spots on their Live Oak leaves. I was hoping to find more on it from the Florida Division of Forestry (www.fl-dof.com), but the website is down. There is a 1987 publication on Tar Spot there and another at www.doacs.state.fl.us, which of course is also down. grr. Best regards, Leanne On Aug 17, 9:21 am, "Dave" wrote: "Scott Harper" wrote in message io.net... With all the rain we had in the late spring/early summer, my live oaks have gone bananas, putting on all kinds of new growth. However, with this hot spell we got last week, all of a sudden I started noticing something strange on a few of them. The leaves are starting to turn brown. This seemed like it happened almost overnight. About half the leaves on an afflicted tree are browning, but I suspect they will all end up turning brown and falling off before it's all said and done. Closer inspection shows black spots on the leaves... on the green ones even before they start turning brown. My guess is it's some kind of mold or fungus related to the extra wet conditions. Here are a couple photos: http://www.employees.org/~harper/leaves/P8160009.JPG http://www.employees.org/~harper/leaves/P8160011.JPG Is this anything to be concerned about? If so, is there anything that can be done to stop it? On a related note, I have a few end tips of branches that are turning brown as well. But they don't have the black spots on them. When you look at them, the branch looks like it has been damaged, enough so to kill it off. It almost looks to me like it got so much water that it grew to fast and ruptured itself. I suppose it could be birds or squirrels doing the damage though. These are few and far between, so I'm not too concerned about them... mostly just curious. Here's a picture of one of these: http://www.employees.org/~harper/leaves/P8160012.JPG scott Its not just your live oaks, its most in Texas area doing the banana thing with branching and leaf growth. Your guess is right on. Its a fungus,Morenoellaquercina. And, as you guessed, is due to too much long term rain. If its widespread and there's neighboring oaks with same problem not on your property, you probably have to let it run its course. Can be treated with general fungicide if localized. Improve air circulation by pruning. Keep the dead leaves picked up, and burn em. The branch problem that I perceive on the upper canopy is what I believe to be oak decline. If you're in a new home, could be root injury as one cause. Oak decline is a sign of a stressed tree. More common in drought conditions. Cut the dead limbs off the tree. No, I don't claim to be an arborist. Dave |
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