P&PDL Picture of the Week for
November 21, 2005

Bitter Pit or Cork Spot of Apple

Gail Ruhl, Senior Plant Disease Diagnostician, Purdue University

Bitter pit and cork spot are physiological disorders caused by a calcium deficiency in the developing fruit. The damage affects the surface of the fruit and does not not affect taste or texture (spots are slightly corky) of the apple.

For more information, refer to:
Ohio State University
University of California -Davis

Photo by Phil Harmon, former Botany & Plant Pathology graduate student

Click image to enlarge

Bitter Pit or Cork Spot of Apple

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service