Utah State University Extension
Lygus bug, Lygus lineolaris, is a true plant bug in the family Miridae (Fig. 1). Sometimes this insect is also called tarnished plant bug. Lygus bug is native to North America and is distributed throughout Mexico, United States and Canada. Western tarnished plant bug, L. herperus, is closely related to the lygus bug and has overlapping distributions in the western United States.
Hodgson, Erin W. and Pace, Mike, "Lygus Bug in Alfalfa Seed" (2007). All Current Publications. Paper 922.