Identification & Incidence: Drought conditions initiated during the spring may lead to the development of two-spotted spider mite (TSSM) outbreaks by early or mid summer. Initial signs of infestation will be evident where drought stress is most severe. Foliage discoloration and mites will be detected on the underside of the foliage. Use of a hand lens is advised to detect presence of adult and immature stages. Mite eggs appear as clear or yellow marbles under magnification. Recently hatched nymphs have 6 legs compared to later nymphs and adults, which have 8 legs.
Sampling and Assessment: Evaluation of a TSSM depends on the distribution of TSSM in a field and the presence of egg and nymph stages, which indicate that infestation may be expanding.
Management Options: Treatment of TSSM may be applied by air or ground equipment. Aerial treatments require use of a miticide with systemic activity. Onset of cool and wet weather conditions may reduce TSSM infestations.