Ramorum Shoot Dieback
Phytophthora ramorum
0 host plants
Last updated
Data Coverage 2 of 6 dimensions
Symptoms associated with Phytophthora ramorum infections include needle blight, a shoot blight resulting from needle infections, and stem lesions resulting from the growth of the pathogen from infected newly emerging needles/shoots into older wood. Symptoms are similar to Botrytis shoot blight on young seedlings.
Remove infected material promptly and improve air circulation. Avoid overhead irrigation that prolongs leaf wetness. For persistent problems, consult WSU Extension for current treatment recommendations.
Quick Reference
Causal Agent
Phytophthora ramorum
Host Plants
0
Favorable Conditions
Cool (55-65°F), wet conditions; young leaves especially susceptible; higher n...
Management
What Triggers Infection
Cool (55-65°F), wet conditions; young leaves especially susceptible; higher nitrogen increases lesion severity; persistent moisture from overhead irrigation
Cultural Controls
- Avoid conditions that promote long moist foliage conditions such as overhead watering, evening watering, and planting too close to a fence.
- Give plant adequate spacing.
- Avoid overwatering plants by watering deeply but infrequently.
- During dry summer months, allow the soil to drain and dry out between waterings.
- Do not plant junipers in poorly draining soils.
- Improve drainage when possible.