Wednesday, August 11, 2010
Hackberry leaf spots may be insect caused.
Hackberry (Celtis spp.) leaves often have spots on the upper surface that looks somewhat like measles or blisters but are light green or yellow in color.
These spots are caused by the Hackberry Blistergall maker (Pachypsylla celtidisvesicula). The blisters are 3 to 4 mm in diameter and only slightly raised from the leaf surface.
There are 25 millimeters (mm) in an inch so these spots are quite small.