Hosts
The fungus attacks species in both the red and white oak groups.
Oak Leaf Blister
Pathogen Type
Scientific Name
Taphrina caerulescens
Frequency
2
Severity
2
Symptoms
The infection site bulges upward on the upper surface and is sunken on the lower leaf surface. The infected area starts out tan and turns brown as the disease progresses.
Cycle
The fungus overwinters on twigs and bud scales and infects new leaves while they are emerging from the bud when there are mild and moist conditions.
Management
At this time, no chemical control is really necessary in the Midwest since this disease does not cause enough damage to justify a preventive fungicide treatment.
Credit
James E. Schuster, retired Extension Specialist, horticulture & Plant Pathology, University of Illinois
PathogenID
34
Images
Image
picID
35081
Image
picID
54771
Image
picID
54770
Image
picID
35088
Image
picID
35089