Decline/Collapse Syndrome
Candidatus Phytoplasma pyri
6 host plants
Last updated
Decline and collapse syndrome cause sudden plant death without obvious external symptoms. You see rapid wilting and collapse despite adequate environmental conditions. Multiple factors may contribute to this complex condition. Remove affected plants and investigate underlying causes.
Management depends on catching it early. Scout susceptible plants regularly and remove affected tissue before the pathogen can spread. Improve growing conditions by addressing drainage, spacing, and irrigation practices. For persistent or severe cases, contact your local Master Gardener program or Extension office for treatment options specific to your host plants.
Quick Reference
Management
Presence of infected source trees; vector population abundance; spring bud break favoring transmission; proximity of susceptible plantings to vectors; tree stress increasing symptom severity
Cultural Controls
- Use resistant or tolerant rootstocks. Remove infected trees from nurseries and young orchards. Collect hardwood cuttings or scion stock in the winter or early spring. Use the best orchard management practices, including the best possible insect and disease control, irrigation, drainage, fertilization, and pruning. Control pear psylla. See the PNW I