By Carl Wilson, Horticulturist, Denver Cooperative Extension
Plant bugs lacerate growth and suck plant juices producing scattered brown spots and distorted growth. Young leaves can be killed. Unless infestations are severe, some damage can be tolerated by trees. Research is incomplete, but experts generally consider six or more insects shaken from a single growth tip significant. In these cases, the terminal growth will appear visibly damaged and insecticide treatments may be considered.
Damage to Honeylocust foliage
Any spraying should be done when insects are small. Mature bugs in the lasts stages of an infestation in June are hard to kill and will disappear shortly anyway. Most shade tree insecticides are effective.
Photographs courtesy of University of Minnesota and Jeff Hahn.
© CSU/Denver County Extension Master Gardener 2010
888 E. Iliff Avenue, Denver, CO 80210
Date last revised: 01/05/2010