Oak leaf rollers and oak leaf tiers fold over or roll leaves which protect them from predators.

Last month I reported on a location in Marinette where oak leaf tier and oak leaf roller were defoliating oak. Since then I had a report of this same combination of pests causing defoliation near Rhinelander. Typically this defoliation is not severe, but when the leaves are rolled up or folded in half it can make it look like the defoliation is more severe.

Written by: Linda Williams, forest health specialist, Woodruff, (Linda.Williams@wisconsin.gov), 715-356-5211 x232.