A destructive leaf and fruit disease which can cause defoliation in mid-summer. Infection starts with olive-green spots with indefinite borders which become more prominent and darken to a greenish black. Severe spotting will cause leaves to senesce and fall off. Spots on young fruit will cause deformation and cracking. Wet spring weather, fog, lack of air-flow through tree, and humidity are contributing factors. Spray treatments can help but usually take several years to be effective. Also, removal of dead leaves and fruit is imperative.