Monilinia fructigena

Alternative names
Sclerotinia fructigena

The fungus Monilinia fructigena develops in the spring (as Blossom Blight) particularly in moderately warm, moist weather. Infections occur on stamens, stigmas, petals or sepals generating brown lesions that spread to other parts of the flower, and through peduncles to other flowers in the cluster and into the twigs. In autumn the same fungus can cause Brown Rot affects ripening or mature fruit.  It typically develops rapidly spreading, buff-coloured pustules of the fungi on the fruit surface, often in concentric rings. Usually seen under wet conditions. Although infection of fruits can take place at any time during fruit development, the disease is only severe in ripe or ripening fruits.

Similar Species

Monilinia laxa

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.


Affects species such as Apple, Pear, Plum, Cherry and Peach.

When to see it

The Blossom Blight stage occurs in spring and Brown Rot is most evident as fruit matures in autumn.

Life History

Survives from year to year on infected twigs, branches, old flower parts, or mummified fruit.

UK Status

Although believed to be fairly common and widespread in Britain it is not well recorded.

VC55 Status

Believed to be fairly common and widespread in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map