Q How do I recognise plum rust?

A From mid-summer, the upper surface of infected leaves are covered with tiny, bright orangey-yellow spots, each with a corresponding tiny orangey-brown spore-filled pustule beneath. The spores darken as the season progresses and leaves fall prematurely. 

Caption: Plum rust causes affected leaves to fall prematurely

Q What should I do if my tree has plum rust?

A Only if severe infections occur for several years in a row does the tree suffer. Regularly mulch trees and keep them well fed and watered to encourage new growth.

Q How can I prevent plum rust?

A The plum variety 'Victoria' is particularly susceptible, so is best avoided if rust is troublesome. Raking up infected leaves promptly helps to reduce disease spread and carry over from year to year. The fungus also lives on anemones so check none of these are showing symptoms.