whats the cause/problem of orange powder on leaves of a grafted willow tree



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    • If the orange powder is on the underside of the leaves it is most likely due to an infection called rust. It is caused by a fungus and is quite common on different species of willow trees. The fungus uses the living cells of the willow tree as its host cells to obtain energy to carry out its life processes. It can be treated by removing the infected leaves and disposing of them and then spraying with the correct fungicide.
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