Gummy Stem Blight (Vine Decline)

Magnolia shows cankers and stem gumming, with vascular streaking and general vine decline. This fungal disorder causes various symptoms depending on the pathogen involved. Use resistant rootstocks, avoid injuring trees, manage irrigation carefully, and select trees from clean nursery stock for best results.

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.