Neem or pesticides registered for use in the control of spruce spider mite can be applied in fall to eradicate the adults. In fall, if infestations are severe, apply a dormant oil spray in mid-winter to kill the overwintering eggs.Click to see full answer. Also know, how do you treat spider mites on spruce trees?You can treat spider mites with insecticidal soaps and horticultural oils, but these treatments can have an undesirable side effect. They remove the silvery-blue pigment that gives blue spruce its color. A safer option is to spray spruce trees weekly with a forceful jet of water to dislodge mites from the branches.Subsequently, question is, how do you treat spider mites on evergreens? Treatments Certified arborists will spray insecticide on affected plants. Repeat applications may be necessary as mites are detected or at 30 day intervals. Injection by a certified arborist can be done on trees where spraying is not practical or the saving of beneficial insects is desired. Consequently, what is the best pesticide for spider mites? Insecticidal soap or botanical insecticides can be used to spot treat heavily infested areas. On fruit trees, horticultural oil should be applied early in the season or late in the fall to destroy overwintering eggs. Dust on leaves, branches and fruit encourages mites.How do you kill boxwood mites?Using a fast stream of water from the hose, wash mites from the boxwood foliage. If this approach isn’t working, you can spray the foliage in summer with horticultural oil. As a last resort, treat the boxwood spider mites with abamectin (Avid), bifenthrin (Talstar), malathion or oxythioquinox (Morestan) in early May.