Medusa Needle Blight
Davisomycella medusa
42 host plants
Last updated
Lodgepole pine needles transition from green to straw color, with distinctive elongate black fruiting bodies visible on most needles in late spring. Davisomycella medusa severity increases following drought stress. Remove and destroy infected material. No chemical control is established for forest conditions.
Remove blighted tissue promptly, cutting well below visible symptoms. Improve air circulation by thinning dense growth. Avoid overhead watering, especially during bloom and new growth periods when tissues are most susceptible. For recurring problems, preventive fungicide applications timed to protect new growth can reduce infection, but cultural controls should be your first approach.
Quick Reference
Management
Open, exposed stands with good air movement favor spore dispersal; drought stress increases susceptibility; intensity increases in years following drought
Cultural Controls
- Remove and destroy blighted plant material and plant debris that is found under trees or caught in limbs.