ORCHARD INSECTS OF THE PACIFIC NORTHWEST 



17 



Figure 18. — Overwintering eggs of the European red mite. About X 2 l / 2 



them. Two are of European origin and the other is native. 



The Pacific mite (Tetranychus pacijlcus AlcG.) 5 (fig. 17) causes 

 more injury than the other mites occurring in the Pacific Northwest, 

 and in some orchards it is the most serious pest that the grower has 

 to deal with. It may be recognized most easily by the quantity of 

 webbing it spins, which often collects dust and gives the foliage a 



6 This species has been confused with the common red spider or two-spotted mite (T. telarius (L.)). A 

 closely related species (T. willamettei McG.), having similar habits, is prevalent on apple and pear in the 

 Hood River and Rogue River Valleys of Oregon. 

 291255° — 41 3 



