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Bronze leaf disease usually starts at the bottom
of the tree and moves upwards.
Bronze leaf disease is caused by the fungus Apioplagiostoma populi and affects mainly Swedish columnar aspen and Tower poplar trees in Grande Prairie. Symptoms occur in late summer and early fall, when leaves rapidly turn bronze or chocolate brown. Veins remain a livid green colour and eventually turn to black. Infected leaves tend to remain on the tree over winter and in spring the fungus releases its spores from these leaves to be carried on the wind and infect other trees.
As the disease spreads, it slowly girdles the branch, eventually killing it. Bronze leaf disease almost always starts at the bottom of the tree and moves upward.
There are no chemical controls available for Bronze leaf disease at this time. The only way to control the disease is through pruning and sanitation.
Bright green veins turning to black is a common characteristic of bronze leaf disease in both Swedish columnar aspen (above) and Tower poplar trees (right).
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