Yellows
Various causes (phytoplasma or viral)
1 host plant · Viral
Last updated
Data Coverage 3 of 6 dimensions
Yellows can show up on landscape plants, producing visible damage that ranges from leaf spots and discoloration to branch dieback depending on severity. Early detection gives you the best management options.
Start with sanitation: remove and dispose of affected material as you find it. Thin dense growth to improve air circulation, and redirect irrigation away from foliage. If the condition persists despite cultural adjustments, your local Extension office can help identify the pathogen and recommend targeted treatments.
Quick Reference
Agent Type
viral
Causal Agent
Various causes (phytoplasma or viral)
Host Plants
1
Management
Cultural Controls
- Use nursery stock that has been tested and found to be free of all known viruses.
- If propagating your own trees, use both virus-indexed budwood and virus-certified rootstock.
- Do not introduce infected pollen into healthy orchards during pollination.
- Establish new plantings in blocks, the larger the better, and preferably at some distance from older orchards.
- Rogue infected trees in new virus-indexed orchards, but it is not economical to rogue or replant mature infected orchards.
- Thermotherapy (24 to 32 days at 38°C) and/or apical meristem culture have been used to eliminate various viruses.