As an infestation builds, the mites move up and infest the whole plant. Mottled, brown leaves are caused by mites feeding on the underside of the leaves. In high infestations, fine webbing is seen. Plants which have been severely infested are stunted and may die. Damage to the plant usually results in reduced yields.
Adults are yellowish-green with a large dark spot on each side of the abdomen.
With the onset of cooler conditions in autumn they become reddish-orange. Females can lay up to 60 to 70 eggs each. Mite eggs are very small and spherical. Juveniles hatch six to 10 days after laying, depending on the temperature. Juvenile stages of mites are similar in appearance to adults but smaller and lighter in colour.