Tree cattle are herding up
Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.
Paul Wylie, CED in Allegan County, sent me some nice photos of some large bark lice (Order: Psocoptera) he observed crawling about on a tree. Paul, whose entomological skills go way beyond modest, identified the bugs as tree cattle, Cerastipsocus venosus. These bark lice are among the biggest of their kind in Michigan. They are usually about 0.125 to just under 0.25 of an inch in length. Their yellow striped abdomens make them quite conspicuous as they move in large herds on the trunks of trees and shrubs feeding molds and fungi that grow on bark. All psocids are characterized by a swollen bump on their faces. Tree cattle are another example of interesting entomological phenomenon and no control measures are needed since they do no harm to the tree.