PEST ALERT- Spruce Spider Mite

— Written By and last updated by Arizona Gragg
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Spruce Spider Mite

It is very important to take the time to scout your trees. Over the past few days, I have found higher than normal populations of Spruce spider mite in multiple tree fields.

In “go to market” trees, a 10% incidence is a high enough rate to treat. The level of infestation and how long the Spruce spider mites are in your trees, will help determine the management strategy. Two products stand out as either stand alone or mixed together. The active ingredients are bifenthrin (Sniper) and spirodiclofen (Envidor). If the infestation is severe, then you will need to think about tank mixing these and/or using the higher mix rates. On the Evidor label, it acknowledges the potential for poorer control if the infestation is severe. Keep this in mind if you use a higher mix rate.


It is best to wait until after the rain has passed to see if the rain has caused the crashing of your particular population. There is a lot of rain in the forecast so let’s hope for some help from the rain.

For more information on Spruce spider mite, please see the articles linked below.

For more information on treatments and scouting, contact Jerry Moody, County Extension Director, at 828-733-8270

Spruce Spider Mite
Spruce Spider Mite on Fraser Fir

Recommendations for the use of agriculture chemicals are included as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services does not imply endorsements by North Carolina State University nor discrimination against similar products or services not mentioned. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label.