Noted: Grubs attack a treeâ??s roots, said Chris Williamson. He is an associate professor of entomology for the University of Wisconsin-Madison and UW-Extension, and heâ??s also Lieschâ??s supervisor. An older tree, with a more extensive root system, can tolerate losing some roots to grubs, he said. Young trees, those about 18 inches tall, canâ??t.
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