Later this month, once the tree is dormant probably after Thanksgiving , prune the tree to reduce the number of spores overwintering on the tree and remove as many leaves as possible from the scene of the crime. Taphrina deformans spores are hardy, so it is best to keep these affected leaves out of compost by bagging them up and using the grey bin.
The disease can spread through leaf detritus. After pruning, spray the naked trees until they are dripping with a copper-based fungicide that coats the tree and kills remaining spores so they will not infect new leaves come spring. Some winters in Alameda are so short and mild that just two treatments may be enough. A favorite plant nursery will be able to help choose the best spray for your yard. Some gardeners treat all their peach and nectarines even if they did not show signs of infection the previous year just to prevent contagion.
Should a tree continue to show symptoms of a fungal infection when the new leaves emerge, or if a newcomer to the garden arrives infected, there are a few steps to take to help your tree as much as possible.
It overwinters within the buds in a saprophytic, yeast-like state feeding very little and on non-living material. As buds break, the fungus penetrates the leaf tissue, causing massive distortion known as hypertrophy swelling and distortion without killing the leaf tissues.
It then produces a bloom of spores on the infected leaves. These lodge in cracks in the bark and the buds, forming the overwintering yeast-like state which persists until the next spring. The tree may produce a second flush of leaves to replace the fallen, infected leaves, but these will not be reinfected by the fungus.
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Plant health. Take part in our research. Meet the team. Shoots that are thickened, distorted and yellow-green in colour. Heavily infected shoots might be killed. Fruit that have raised, irregular rough patches and are often red in colour. Such fruit often falls prematurely.
Economic importance If uncontrolled, leaf curl is very destructive. Disease cycle and environmental conditions Cool, wet conditions during leaf emergence in spring favour the development of leaf curl.
Controlling peach leaf curl with fungicides Leaf curl can usually be controlled satisfactorily by a spray of a suitable registered fungicide at any stage of dormancy. Where the disease has been difficult to control in previous seasons, use a program of 3 sprays: Apply the first spray in autumn, at leaf fall. Apply the second spray immediately before budswell at the late dormant stage.
Apply the third spray about 1 week later at budswell.
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