There are several species in Manitoba, including Lygus borealis and Lygus desertinus . This IPM profile only discusses the first 2 species but much of what is given is also applicable to other lygus bugs. Adult lygus are about 5 mm long and 2.5 mm wide. Legs and antennae are relatively long. Eggs are slightly curved and approximately 1 mm long.
Young nymphs are blue-green in colour, and look like aphids but are more active.
Colour in the older nymphs becomes more variable and is similar to that of the adults. Nymphs develop prominent black dots on the top of the thorax and abdomen. There are five nymphal instars. A cuneus is present and 1 or 2 cells are present at the base of the membrane. Pale greenish-yellow in colour, they are tinged with brown.