The association of the insect with these damage symptoms confirms black grass bug damage. If black grass bug is found, check the extent of the infestation by taking sweep net samples beginning at the field margin and progressing to the center of the field.
Infestations are usually heaviest or entirely confined to the edge of the field.
No economic thresholds have been established. No pesticides are registered for treatment of black grass bug on small grains. The Regents of the University of California. All rights reserved. For noncommercial purposes only, any Web site may link directly to this page or photo file.