Pest and Beneficials Search (search again)

Pear stony pit

Unknown, virus suspected

Dark-green spots appear on developing fruit about two to three weeks after petal fall. The tissue around the affected areas continues to grow, forming deep pits. Older pits develop necrotic centers. Heavily infected fruit are often severely deformed, gritty, and difficult to slice through (A). Doing so, however, reveals pitting throughout.


Widespread; it is the most important viral disease of pear.

Similar Species

Similar symptoms can be caused by the pear plant bug.


Pear stony pit is almost exclusively managed in the nursery through the use of disease-free propagated material. In the orchard, trees affected one year may not be affected in subsequent years.

Pest and Beneficials Search (search again)

The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the AgBioResearch, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.