Optimal Conditions
When there is lack of airflow, the lack of spores are more likely to infect
Signature
Leaves turn a paler green colour and then begin to curl and ‘bubble’ and turn darker.
Prevention
The infection jumps from tree to tree, so keep an eye on neighbouring plants for signs and keep your plant healthy and strong.
Coping
Remove any infected leaves, from both the tree and the ground and dispose in the bin (not compost bin). You will also need to give the tree some extra love to limit stress. Apply a seaweed solution to the soil and to the leaves every month and keep it well watered.
Eradicating
Just before bud burst, spray your trees with copper hydroxide or copper oxychloride, ensuring thorough coverage over all branches and leaves. If your tree was severely infected the previous season, it doesn’t hurt to spray in mid-winter and then again just before bud-swell.