We also have numerous archived posts on Smoke tree. This article gives additional information on possible Smoke tree problems. Fungal spores spread by splashing waterso avoid overhead watering and prune the tree to improve air circulation around the tree so that the leaves dry out quicker after a rainfall. Leaf Spot Diseases: Leaf spots are caused by fungal infections and rarely are a danger to healthy trees. Dispose of the infected material, do not place it in the compost bin The only course of action is to prune away infected areas and clear away any fallen leaves and other plant debris from around the tree. This soil-borne fungal disease blocks the water-conducting cells in the tree causing the leaves to wilt due to lack of water. Verticillium Wilt: Leaves will appear to wilt and turn yellow around the edges. That being said, there are a number of diseases that can affect the Smoke tree-: The mulch helps keep the roots cool in hot summer weather, helps retain moisture and insults the roots in the winter. I would also suggest adding 3-4” of mulch around the roots of the tree making sure to keep the much away from the tree trunk, since this promotes fungal diseases and rot. I would begin by giving the tree a thorough soaking. Usually normal rainfall should be enough for the tree except in prolonged periods of drought, which is what we have seen in the month of August. Smoke trees are known to have a high tolerance for drought. Unless, you have been giving the tree additional water it could be that the tree is naturally losing leaves to protect itself from water loss through leaf transpiration. During the month of August and September we have had significantly little rainfall accompanied with extremely hot sunny days. My first thought would be that the leaves are drying up due to premature leaf drop. It is difficult to say why the leaves of your smoke tree have been turning brown. The Royal Horticultural Society has given it the prestigious Award of Garden Merit (AGM).Thank you for contacting the Toronto Master Gardeners concerning your Smoke tree, Cotinus obovatus. The fluffy pink plumes in summer really do look like clouds of smoke. Cotinus coggygria ‘Royal Purple’ – this large shrub puts on a great show with the deep purple leaves turning rich red in autumn.Large fluffy pink flower plumes appear in summer. Cotinus 'Candy Floss' – this large shrub has bronzy young leaves, turning green in summer and shades of yellow, orange, and purple in autumn.The flowers appearing in June and July are a smoky yellow. The Young foliage is yellow with hints of red, turning fiery orange in autumn.
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