Aphthona czwalinae
Adults are found on plants from May through July.
Agonopterix alstromeriana
Mature larvae are small, green caterpillars with three dark stripes running the length of the body.
Aceria malherbae
A. malherbae are visible when viewed under a microscope.
Larinus minutus
Damage can reduce stand density and provide excellent control.
Cyphocleonus achates
C. achates can kill knapweed plants in a single year, but populations are often not dense enough to reduce entire stands of knapweed.