Oak Leaf Blister Of Oak

Disease Information

Oak Leaf Blister

Symptoms and damage

Oak leaf blister is a disease caused by the fungus Taphrinacaerulescens. Most oak species are susceptible, but pin oak and the white oak group are especially so. Minor infections cause little harm, but midsummer defoliation can occur when infections are severe. Blister-like patches appear on the leaves. They are often lighter green than the surrounding tissue and later turn brown. The blister-like patches result from overgrowth of infected leaf tissue, which is caused by substances secreted by the fungus.


 Leaf blister is rarely severe enough to require control measures. Once infection has occurred, fungicide treatments usually are ineffective. If infection is very heavy and if the tree is small enough to obtain good coverage, a fungicide could be applied in the spring just before bud break.


Examples of Fungicides (Myclobutanil - Neem Oil – Propiconazole - Thiophanate-methyl )



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