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Photo by Jeff Burbrink, Extension Educator in Elkhart County.
This Io moth caterpillar (Automeris io) was found on an apple tree.
Io moth larvae are green with red and white stripes running the length of their bodies, which can be about two inches long. Notice the numerous spines that are very painful to the touch (described by some as a sting).
Although these larvae potentially will feed on the foliage of any tree or shrub, some of their favorites include apple, rose, and cherry. Damage is rarely severe.
Plant and Pest Digital Library and Digitally Assisted Diagnosis, Purdue University, West Lafayette, Indiana.