Spruce spider mites feed on fir, arborvitae, spruce, and other conifers. This mite feeds on older foliage first and damaged foliage has a yellow to bronze coloration. Spruce spider mites begin to feed about 2301- 3957 [3094 peak] GDD base 50 and usually continue until a hard frost. The mite is dark green to dark red after initial feeding and overwinters as a reddish colored egg. The
damage found during the summer on plants is the result of heavy feeding by this mite the previous fall and spring.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjY154IGnjEVHoqHc3i_fnk6oSUqNgV6DXOtSWTZceeqwHRrk4iagPcy2SDrE0dYwNwcmqq6L60nzlMBH4lSiHBOSYlj_fotx_N_-fOLYEBeD7QbAzx8YeI5TlHOvNi9JywZwDGnfiIK8w/s400/sprucemite2.jpg)
Information from Brian Kunkel, Ornamental IPM Specialist, UD
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