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Image Courtesy Canadian Forest Service
The birch tree miner is a threat to a birch tree and it is the larvae of the birch leaf miner which causes damage by burrowing into birch leaves in search of nutrients. The first indications of birch miner infestation are small green spots on the leaf surface, usually noticeable in May or June, which develop into ugly brown splotches. A birch leaf miner infestation rarely kills birch trees on its own but it is disfiguring and can weaken a tree. The leaf miner season begins in late April to mid May with eggs laid in slits on the upper surfaces of birch leaves. Of the number of pests which are attracted the birch trees, the bronze birch borer is the most important as it is both lethal and difficult to control. Evidence of borer infestation is a progressive thinning of the crown of the tree beginning at the top. Trees generally die after about two or three years, that is, after two or three infestations by the larvae. If caught early enough, there are insecticides available to prevent new infestations of the borer but these will not kill larvae already active in the tree. Insecticides such as dormant oil control only the egg stage. Trees with advanced crown loss will not benefit from insecticide use and should be removed. The good news is that healthy, well-situated, well-maintained birches are more resistant to the borer. Females prefer to lay eggs in the sunlight and are less attracted to trees whose trunks are shaded. The insects are also attracted to tree wounds and so care should be taken to avoid damaging the bark of trees.
Image Courtesy Canadian Forest Service
What else can I help you with?
What year did Rosalind Franklin die?
Rosalind Franklin died on April 16, 1958 at the age of 37.
What do you call a flower that died?
A flower that has died is often referred to as a "wilted" flower.
What would happen if you put the stem of a white flower in water color red?
Osmosis. Osmosis is the diffusion of water. The plant sucks up the water that was died red and it is brought all the way to the petals through the xylem tubes by osmosis. Celery does that too. Most plants do.
When did Carolus Linnaeus live?
Carolus Linnaeus died on January 10, 1778 at the age of 70.
When did James Watson Kernohan die?
James Watson Kernohan died in 1981.
What season did Snow White die?
Snow White died in the spring.
What are the achievements of Thomas Birch Freeman?
Thomas Birch died on January 9, 1766 at the age of 60.
When did Preben Birch die?
Preben Birch died in 1992.
When did Lamorna Birch die?
Lamorna Birch died in 1955.
When did Albert Birch die?
Albert Birch died in 1936.
When did Arnold Birch die?
Arnold Birch died in 1964.
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Cliff Birch died in 1990.
When did Frank Birch die?
Frank Birch died in 1956.
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Halvor Birch died in 1962.
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Reg Birch died in 1994.
When did Eugenius Birch die?
Eugenius Birch died in 1884.
When did Jim Birch die?
Jim Birch died in 1935.
