Q.Plum disease
Our usually very productive plum tree (purple plums) is diseased this year. Some fruit ok but some diseased. Brown spots at start then fruit is rotting. What should I spray with and when please?

Certified GKH Gardening Expert
This article will help with regard to the types of spray and when to apply it. https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-spraying.htm
This article should help you identify what's harming your tree: https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm