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[IBC] Sudden Maple Death
Hi everyone. I had a strange and depressing thing
happen this week. It *is* depressing. But if you want to know what caused it, you need to look at the roots immediately, because the longer you wait, the harder it will be to figure out what happened (people often send maples to the diagnostic lab months after they first showed symptoms, and we can't tell by then what happened). So just to be safe i cut the branch off well above the dying back section leaving space for any die back which sometimes occurs. That's a good plan if the plant has a blight disease, but won't help if it has a root disease. It did not turn black and did not look like vertimiculum wilt, which i have run into before. It could be, though. You need to get a single-edge razor blade or a good knife and shave the bark at the base of the trunk. Keep shaving until you get to the wood, then watch as you shave, for brownish streaks in the wood. If you sent it to me (or to a Cooperative Extension Office) we would put a block of wood in a moist chamber and watch to see if Verticillium grew out of the xylem vessels). Vert is often difficult to diagnose, and the fungus disappears once the tree has been dead for a while. Then you start picking up secondary pathogens. Other possibilities: look for cankers (sunken areas) on the trunk. The tree could have been girdled by a Nectria canker, or by bark beetles. Do what Jim advised, and clean your tools, get rid of the corpse and soil far away from your other trees, and keep those other trees in peak condition. Trees can fight off Verticillium. If you live somewhere with hot summers, heat will make one of the two species of verticillium go dormant, and often the tree will then wall it off and go on to be healthy. -- Nina Shishkoff Frederick, MD ************************************************** ****************************** ++++Sponsored, in part, by Mike Page ++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
#2
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[IBC] Sudden Maple Death
Nina Shishkoff wrote:
SNIP clean your tools, get rid of the corpse and soil far away from your other trees, and keep those other trees in peak condition. Trees can fight off Verticillium. If you live somewhere with hot summers, heat will make one of the two species of verticillium go dormant, and often the tree will then wall it off and go on to be healthy. Nina Shishkoff, Frederick, MD ==== Nina: Do you have any data on how hot and how long the heat must be there for Verticillium to go dormant. And is this a virus or a bacterium? Alan Walker, Lake Charles, LA, USA http://LCBSBonsai.org http://bonsai-bci.com ************************************************** ****************************** ++++Sponsored, in part, by Mike Page ++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
#3
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[IBC] Sudden Maple Death
Nina: Do you have any data on how hot and how long the heat must be there for Verticillium to go dormant. And is this a virus or a bacterium? Alan Walker, Lake Charles, LA, USA http://LCBSBonsai.org http://bonsai-bci.com Do I look like a virologist? Do I look like a bacteriologist? I do not. I look like a mycologist, and Verticillium is a fungus. My reference (Sinclair, Lyon and Johnson) does not give a temperature, but says that the fungus is killed in above-ground parts of trees in California, and survives in the [cooler] root systems. I found a paper by some scientists in Syria who were enclosing olive trees in plastic tents to cure them of vert, and they were using temperatures of 30-36 C. In bonsai, the whole plant can be heated up, and theoretically cured. I have never heard of a nursery trying this, however. The best treatment is prevention: buy clean stock and plant it in soil-less media. If you don't splash infected soil around, and you use clean tools, it will be difficult for the fungus to get into the bonsai soil. -- Nina Shishkoff Frederick, MD ************************************************** ****************************** ++++Sponsored, in part, by Mike Page ++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
#4
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[IBC] Sudden Maple Death
====
Nina: Do you have any data on how hot and how long the heat must be there for Verticillium to go dormant. And is this a virus or a bacterium? Alan Walker, Lake Charles, LA, USA http://LCBSBonsai.org http://bonsai-bci.com Mmm. WE qualify, Alan. ;-) So do TX, NM, AZ, S. Calif. and a few of the lower states in the Midwest. But it doesn't always happen. It is going to depend on how healthy the tree is in all other respects. You will want to dose it heavily with Nitrogen fertilizer while you're hoping it will "wall if off." Jim Lewis - - Tallahassee, FL - The phrase 'sustainable growth' is an oxymoron. - Stephen Viederman ************************************************** ****************************** ++++Sponsored, in part, by Mike Page ++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
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