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31-Mar-2007
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#1 |
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Bonsai Barry
 
Join Date: Dec-2004
Location: Santa Maria, CA
Country: USA
USDA Zone: 9
AHS Heat Zone: 3,4
Posts: 1,157
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Mystery boxwood plague
I have four different varieties of boxwood that seem to all be dying. I've researched diseases without success. About six weeks ago we had an unseasonable cold snap for four or five days with temps dipping into the low 20's (f). Would this have cause the die back?
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Bonsai Barry "Our talent lies in our choices." |
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Mystery boxwood plague |
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31-Mar-2007
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#2 |
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CATAMENIA
Join Date: Dec-2006
Location: Bakersfield, CA
Country: US
Posts: 35
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That happened to me as well. My boxwood and a couple of my Cherry bushs got a little shocked by a few consecutive cold nights. My boxwood looked just like those, but it came back nicely.
 Thats my guess. Your from Santa Maria... Have you been to the nursery in Nipomo? (Muranaka) I made a visit a couple of weeks ago. Fun fun!
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31-Mar-2007
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#3 |
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Enthusiast
 
Join Date: Feb-2005
Location: Carlsbad, California..coastal desert
Country: United States
USDA Zone: 11
Posts: 5,462
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A friend of mine had a saikei planting with boxwoods. The two big ones in the middle died, and the rest were fine! We found out that the two in the middler were one type (Korean?) and the others were another type (Chinese? I don't remember which was which). Anyway, one type is more prone to a disease than the others.
Joanie
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31-Mar-2007
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#4 |
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bonsaiTALK Master
 
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The symptoms shown on the leaves do not look like a parasitic disease but more like desication of the leaf tissue due probably to cold desication during cold periods.
During cold spells the trees continue to lose water by transpiration and is greatest during periods of strong winds, and more so, when it is bright and sunny. Even though the air temperature is cold the temperature inside the leaf can still be warm but during bright sunlight and wind the rate of transpiration becomes much higher. This causes desiccation of the exposed leaf tissue since water is leaving the plant foliage faster than the roots can replenish lost moisture. Furthemore, root absorption can be reduced or prevented when the soil is cold or frozen. This causes the foliage to turn yellow or orange due to the same type of desiccation. More severe injury can be observed as discolored, burned leaves as shown on your tree and in the most severe cases the branches can also dry out. Damage is normally worst on the side of the plant facing the wind or the especially if the tree is near a reflective surface like the white wall of a house, a concrete paving or snow cover. |
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31-Mar-2007
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#5 | |
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Bonsai Barry
Join Date: Dec-2004
Location: Santa Maria, CA
Country: USA
USDA Zone: 9
AHS Heat Zone: 3,4
Posts: 1,157
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Quote:
Very informative. I've learned something today. Thanks.
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Bonsai Barry "Our talent lies in our choices." |
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