By Linda Williams, forest health specialist, Woodruff, Linda.Williams@wisconsin.gov, 920-360-0665
Oaks in some northern counties are experiencing defoliation from oak sawflies this year. These native defoliating insects are small, hairless, semi-transparent larvae or “slugs” that feed on oak leaves.
Oak slug sawflies feed in groups on the undersides of oak leaves.
By Linda Williams, forest health specialist, Woodruff, Linda.Williams@wisconsin.gov, 920-360-0665
Barklice tend to congregate in large groups on trees, which can lead some people to worry about tree health, but they are actually quite harmless.
Immature barklice congregated on bark. Striped abdomens are easy to see before the insects mature into adults and develop wings.
