Bean spider mite adults are about 0.5 mm long with eight legs and are uniformly red, without spots. Nymphs and larvae are yellow-green and may show dark spots on each side near the middle.
Damage caused to crops are a bronzing or whitening of the upper leaf surface, particularly near the leaf stalk. Depending on the crop type, leaves turn red or yellow with heavy populations and fine webbing is visible on the lower leaf surface. Heavy infestations can result in leaf desiccation and leaf drop.