Spruce Spider Mites are native to North America and are one of the most destructive spider mites in the U.S. Its preferred host is spruce but will also feed on other trees and plants. They can cause considerable damage early in the season and again in the fall.
The young hatch in mid March to late April. Feeding begins and continues through the cool, moist days of spring. When hot, dry conditions begin and daytime temps reach above 70 degrees activity slows and resting eggs are laid. The young will hatch again when the cooler days of fall resume.
The first indication of Spruce Spider Mite damage is an off-green color, mottling or stippling of the needles. This may not be very noticeable until early or late mid-summer. Fine webbing may also be present. In severe cases, twigs and branches can drop all their needles and die leaving dead areas. These stressed trees may be killed.
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