Fungal disease commonly found on the leaves of stone fruit such as plums, peaches, and nectarines. The fungus overwinters in crevices in the tree bark. Afterwards it affects the leaves causing them to curl up and bubble. In bad cases photosynthesis will be affected, growth of the whole tree may suffer, and the leaves may even turn brown, shrivel up, and fall off the tree.
Only a problem in severe cases, though it’s worth treating early to avoid any later complications.
Fungal diseases like this thrive in warm, humid conditions and are more likely to badly affect unhealthy plants.
Keep plants healthy by ensuring they are well fed and watered.
Improved air flow around the tree will help to reduce the problem. Improve air flow by ensuring there is sufficient space between trees, and training and pruning the tree into an open vase shapes (for best results summer pruning is generally recommended).
Spray thoroughly with Liquid Copper in late winter, just as the buds begin to swell. If Leaf curl becomes a severe problem repeat spray after the tree has finished flowering.
In most cases copper sprays are allowed to used around 4 times a year under organic certification.
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