Elm Wilt
Dothiorella ulmi
A serious fungal wilt disease that affects elms, causing progressive yellowing, wilting, and dieback. The fungus enters through wounds and moves through the vascular system, plugging vessels and creating characteristic cankers.
Identification & Symptoms
What to Look For
Potential Damage
Lifecycle
The fungus moves down leaf petioles into twigs, entering and plugging vessels. Cankers develop around infection sites. New pycnidia develop during summer and autumn, releasing spores during spring rains. Spores spread by wind, rain, overhead irrigation, and pruning tools.
Professional Treatment Approach
Apply Fungisol as preventive treatment during high-risk periods
Remove and destroy infected branches during dry weather
Avoid wounding trees through improper pruning or equipment damage
Sterilize pruning tools between cuts with 70% alcohol
Improve tree vigor with Arborfos to enhance natural resistance
Avoid overhead irrigation that promotes spore dispersal
Recommended Mauget Products
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