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20-Sep-2006
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#1 |
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one love
Join Date: Feb-2005
Location: Chicago
Country: United States
Posts: 75
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black spot on new elm
okay so i just got a new elm tree not too long ago, and i noticed that it somehow got the BLACK SPOT fungus on the leaves, so i cut most of the leaves that had this black on them off, and ordered a botte of mancozeb. i was just wondering how i should go about treating this elm so it doesnt die? and how do i use the mancozeb?
another thing, i live in chicago illinois, and its starting to get cold, so what type of winter preporations should i take, and what would be the best place to put this tree when the temp starts to drop drastically? i have it sitting outside in the backyard for now, with partial shade. |
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black spot on new elm |
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21-Sep-2006
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#2 |
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recovering pine addict
 
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black spot
If you're talking chinese elm the black spot was due to water setting on the leaves. Try to keep the leaves as dry as possible. During rainy periods move it to shelter. I use daconil or even neem on my elms to control it. Keep it above 25 degrees and out of the wind in winter. I keep mine above 32 but I'm zone 8.
Tim Last edited by TimZ8 : 21-Sep-2006 at 12:02 PM. |
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21-Sep-2006
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#3 |
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BonsaiTalk Master B.S.er
 
Join Date: Jun-2002
Location: Richardson, Texas
Country: God Bless America
USDA Zone: 8
Posts: 1,284
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Your Chinese elm's blackspot should be able to be treated effectively with this fungicide. You will need to follow the fungicides instructions for application. It is important to note that the black spot is caused by moist humid conditions when the tree is just leafing out. The single best preventative is not to water/wet the foliage while it is still green and tender after leafing out. Water directly to the soil surface, and keep out of rain until the leaves harden off.
Winter preparation methods vary, but you will want to allow your chinese elm to loose it's leaves and enter dormancy, and for it to remain in dormancy until night time temps are again above freezing next year. In my location, I put my deciduous trees into my unheated garage for the winter, still maintaing moist soil conditions. For you, I would recomend checking with more experienced bonsai club members in your location for how they over winter theirs.
__________________
Emerging from winter slumber Bonsai trees burst buds anew Spring is upon us! -Paul S. |
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21-Sep-2006
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#4 |
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bonsaiTALK ArchMaster
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You may have made a very bad mistake in removing leaves to get rid of black spot. Since it is fall, the tree was outside, it was probably preparing itself for a winter dormancy. Pruning of any sort this close to fall can result in flush of new growth. That's a very very bad thing, if you're going to winter the tree outdoors, since all that new growth willbe killed off come first freeze. That will weaken the tree before its witner rest and will greatly diminish its stored capacity to begin growing next spring.
I would stop futzing around with trying to prevent spots on leaves that will be on the tree only for a few more weeks anyway.  I'd also stop almost all activity with the tree. It just needs to be left alone, with an eye to keeping it moist, but not wet in the coming weeks. I'd also look for a sheltered spot in the yard or unheated garage to store the tree in beginning in mid-November. Let the tree get hit by thre or four frosts before putting it away... |
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21-Sep-2006
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#5 |
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one love
Join Date: Feb-2005
Location: Chicago
Country: United States
Posts: 75
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so i shouldnt treat the tree with the medicine i got? would it really be better to just leave it alone?
and if i take the tree in my unheated garage for the winter, when should i do this?, and how much light will the tree need? i made a ledge right under a window in my garage. the window that the ledge is under is facing WEST, so it wouldnt have any morning sun, only afternoon, will this be ok? Last edited by barczak769 : 21-Sep-2006 at 11:03 PM. |
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22-Sep-2006
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#6 |
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one love
Join Date: Feb-2005
Location: Chicago
Country: United States
Posts: 75
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22-Sep-2006
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#7 |
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bonsaiTALK ArchMaster
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Let the tree alone. Leave it outside until mid November. Let it get hit repeatedly by frosts--not hard freezes below 25 though. Frosts are a key part of a tree's dormancy cycle. They slow the tree down and make it drop its leaves. Once the tree's leaves have either fallen off, or have turned brown--some elms will retain dead leaves in the winter--move the tree into the garage. Bury the tree's roots--pot and all--into a box of pine bark mulch that's been well-moistened. Dormant deciduous trees need no light during dormancy. Keep the tree away from the window and sunlight, as that can warms things up too much, resulting in early bud break. Let the plant alone--save for checking every few weeks to make sure the roots remain moist--not soggy. Don't worry if the root ball freezes. As long as it stays above 20 F in the garage, the tree will be fine.
As buds begin to swell in the spring, you've got to make sure the tree doesn't come out too early. This can mean moving the plant outside in the daytime to a shaded place that remains cold, and back inside at night... |
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