Plum Pox (Sharka)
Plum pox virus (PPV)
36 host plants
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
Leaves show pale rings or mottling patterns while fruit develops sunken spots and internal staining, becoming completely unmarketable. This virus causes severe economic damage in stone fruit production throughout the region. Use virus-tested stock only and remove infected trees promptly to prevent spread through space.
The most practical approach is to reduce the conditions plum pox (sharka) needs to thrive. Prune for better airflow, water at the base rather than overhead, and remove infected material promptly. For high-value plants or recurring problems, preventive treatments timed to protect new growth during the infection window can make a measurable difference.
Quick Reference
Management
Initial infection occurs when aphid vectors feed on infected and healthy trees during spring and early summer (April-July). Leaf symptoms become visible by mid-summer (June-July) as chlorotic flecking or rings appear. Fruit symptoms develop on fruit maturing in late summer (July-August). Once infected, trees remain infected for life with recurring annual symptoms on new foliage and fruit. Young stone fruit plantings are vulnerable to nearby infected trees via aphid vectors. Most economic impact seen in subsequent seasons as tree vigor declines and productivity is lost. Source: USDA APHIS
Symptom expression depends on PPV strain and host cultivar susceptibility. Leaf symptoms (flecking, ring spots, lineations) vary with cultivar. Fruit symptoms develop during growing season showing pitting, discoloration, and color rings. Cooler temperatures may suppress symptom expression in some cultivars. Environmental stress increases symptom severity. Virus replication rates and systemic spread influence symptom timing and intensity. Young infected trees show symptoms earliest. Source: USDA APHIS