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From: Steven Wright
Green Bay, WI
I have very small insects, (only seen on white paper after shaking branch of my Emerald Green Arborvitae looking for mites) that are oval with two antennas and tan in color. After a few seconds of hitting the white paper they ran around very fast. The needle are turning brown. What will kill them?

Extension Message
From: Richard Hentschel
Extension Educator, Horticulture
DuPage/Kane/Kendall Unit
Spider mites once established and in high numbers can severely damage needled evergreens including Arborvitae. Mites are not closely related to our typical insects and are more difficult to manage. This one may be spruce spider mite, known to attack arborvitae as well. Non chemical treatments include weekly spraying the needles with a strong forceful stream dislodging the mites and syringing the foliage during hot dry spells when feeding damage is more visible. Stressed plants seem to be more attractive to the mites. Insecticidal soaps will also be effective, Be sure to get through coverage. Suggest a call to your local Extension Office for a more local and focus reply. Additionally Wisconsin may have products to use not allowed in Illinois.

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