Problem Solver


Brown Rot

Monilinia fructicola

What is Brown Rot?

Brown rot is a problem mostly of stone fruit such as peaches and nectarines. The fungus
overwinters in mummified fruit which has either fallen to the ground or is still attached to the tree. Cankers
on stems and spurs are another source of disease spores. At blossom time the fruiting bodies of the fungus
develops toadstool-like structures which shed millions of spores. These spores will shed at the slightest

What are the symptoms?

Flowers of fruit trees wilt and turn brown. Flowers will often stay attached to the tree. Brown spots
appear on fruit which expands to a powdery mass of tan coloured spores. The fruit quickly rots and if left
on the tree will dry and turn into a “mummy”.