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14-Mar-2006
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#1 |
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bonsaiTALK Master Craftsman
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Boxwood leaves
My large boxwood has been experiencing some yellowing in its inner leaves. There si some healthy new growth in the crown but the inner leaves are acquiring this rusty color. My question: This is my first boxwood, is this normal this time of the year or am I dealing with a disease? Thanks in advance...Will try to post a picture later on.
Jorge
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Boxwood leaves |
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14-Mar-2006
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#2 |
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bonsaiTALK Craftsman
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My first reaction was frost burn but I then saw your location.
Because boxwoods develop such a dense canopy, the inside leaves will sometimes get insufficient light. If yours is particularly thick, a thining might be the answer. |
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14-Mar-2006
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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: 5,433
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Are they yellow, or rusty? Mine turned a bronze/rust color because of the cold (not that cold really) and that seems to be the norm in the winter.
Joanie
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Dogs are just children who eat off the floor
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14-Mar-2006
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#4 |
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bonsaiTALK ArchMaster
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That coloring means the leaves are old and the tree is dropping them. Boxwood are broadleafed evergreens, but like pines, they do drop leaves. They just don't drop them all at once in the fall. They give up old leaves in spring in favor of new growth. The inner leaves are the oldest on the plant.
Such leaf drop can also indicate the inner portions of the plant aren't getting enough light. Thinning out new growth can stimluate new leaf development on inner shoots. |
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14-Mar-2006
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#5 |
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bonsaiTALK Master Craftsman
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We haven't had any frosts here in S. Texas for over a year. Rockm is right, most of the yellowish/ornange colored leaves are deep inside the canopy where they don't get much light; they are also old. The new leaves are at the top of the canopy and they are light green and softer. The tree does not seem to be sick otherwise and, except for the color, the leaves are spotless. Now, I've heard about something called canker and from what I know is a bad disease. I'm not sure if this could be canker...
Thanks again Jorge Jorge
__________________
"Always acknowledge a fault. This will throw those in authority off their guard and give you an opportunity to commit more." Mark Twain |
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14-Mar-2006
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#6 |
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bonsaiTALK Master
 
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canker
canker is an infection of a branch or the trunk by a fungus or bacterium which prevents the circulation of the sap to the leaves.
The symptoms of the disease would be the wilting of the leaves on the infected branch and a gradual dieback if the canker completely girdles the branch. As was said, it is normal for old leaves to fall off when its job is done to be replaced by new ones. |
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