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Nina,
Are you the Nina Shishkoff, plant pathologist from the LIHRL, that wrote "Using Fungicides to Control Bonsai Diseases" at: http://www.evergreengardenworks.com/fungicid.htm? That article talks about using "An ERADICANT" to "...kill fungi that have already invaded the plant." Later in the article several fungicides are mentioned, including Fosetyl-A1 and Metalaxyl for water molds and thiophanate methyl for other fungi, but fails to distinguish if these are systemic fungicides or eradicants. Has more recent work invalidated portions of that article? Would sustained, judicial, treatment of all three types of fungicides (protectant, systemic, and eradicant) not slow or halt progression of the infection allowing more time in which to perform repots and continued isolation and removal of the infected tissue. I've also read that the use of thiophanate methyl will affect the mycorrhizal fungi. Should new colonies be introduced after any use of this fungicide? This tree was a gift from my wife and it was immediately obvious that the organics in the soil had broken down and the soil compacted. I repotted the tree but the only soil I had available was shohin soil - low organic and free draining but the particle size could have been larger. The roots looked a little thin but otherwise ok at that time. I trimmed them back to about half their length - about 18", still too long but I was considering the overall quantity of roots tips and figured I could adjust at the next potting - then treated with rooting hormone to increase root mass near the base. That was several months ago and now I'm getting suspicious that the tree may have root rot. I've had a couple of limbs die and while I'm getting new growth the old growth seems to be suffering. I'm planning to repot to an inorganic soil (lava) of the appropriate particle size and want to be prepared for what I find. Thanks, Don -----Original Message----- From: Internet Bonsai Club ] On Behalf Of Nina Sent: Saturday, April 09, 2005 9:33 AM To: Subject: [IBC] Root Rot-TREATMENT Does anyone have any suggestions for a systemic fungicide for use on a Texas Ebony (Pithecellobium flexicaule) with root rot? I can answer this question with absolute certainty, because I just finished a study of the effects of systemic fungicides on Phytophthora ramorum on Rhododendron (come to Austin, Texas this August for the American Phytopathology Society meeting, and you can watch my Powerpoint Presentation!)*. The answer: Systemic fungicides do NOTHING for an existing infection. They aren't fungi-CIDES (i.e. fungal-killers), they are fungistatics (fungal growth inhibitors). The pathogen will stop growing for a couple of weeks, then it will start up again. The only way to use a systemic is as a preventative measure, and I don't recommend that for a hobbyist- only for a professional with thousands of plants. My reason for looking at this is because nursery retailers in California are suspicious that big wholesalers are treating plants with systemic fungicides to arrest "sudden oak death" long enough to sell them. But my findings are pretty clear: they symptoms are still visible, even if the pathogen isn't growing, and a PCR molecular test will detect the pathogen. Nina, who infected 30 plants last week in order to look at the effect of systemic fungicides on antibody-based detection methods. *Any bonsai-related stuff to do in Austin? ************************************************** ************ ****************** ++++Sponsored, in part, by Edmund Castillo++++ ************************************************** ************ ****************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- -- +++++ Questions? Help? e-mail +++++ ************************************************** ****************************** ++++Sponsored, in part, by Edmund Castillo++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
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