Two-spotted spider mites hit high tunnel vegetables

In mid-June I saw several high tunnel tomatoes and cucumbers with moderate to severe two-spotted spider mite (TSSM) Tetranychus urticae infestations (Fig. 1 at top). These pests vary in color from white to yellow to red. Mites feed by sucking chlorophyll from the plant, which at first appears as small white or yellow marks on the top surface of the leaf (Fig. 2). This damage may look like other problems early on and because the mites are difficult to see on the underside of the leaf a