Stony Pit

You'll see severe fruit pitting, dimpling, and deformation on pears (especially 'Bosc'), with excessive stone-cell development below pits. A graft-transmissible virus causes this under specific climatic conditions. The disease is sporadic in the PNW. Use only certified virus-tested trees and remove infected trees completely. Prevention through disease-free propagation is the only control.

Remove and replace with a tree that has been tested and found free of all known viruses. Establish new plantings only with certified virus-tested trees.