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Spider mites in Junipers #941637

Asked August 05, 2026, 3:49 PM EDT

I have a yellow & brown coloration in the junpers that appeared quickly in the last 2 weeks. It may have started earlier due to the high heat we have been having but there seems to be some fine webbing on some branches so I am concerned about the possibility of spider mites. These juniper beds are in several places in my yard and are about 30 years old. What miticide would you recommend I use to get rid of spider mites and where can I buy it? Thanks for your help.

Weld County Colorado

Expert Response

Thanks for contacting us about your junipers. The pictures and descriptions (which are great – thanks) are consistent with this problem. Rather than restating the info in this email, please see the link below which will answer the different questions you have. Go into the store armed with the active ingredient listed in the chart and you can select the miticide treatment that meets your needs.


Note that increased water (including some jetted hosing) can help. Also, often mites have natural predators that keep these mites in check. Many insecticides used in the area can eliminate/kill those natural predators and cause increased populations of mites.


Watch for next year’s new growth, and prune out any dead (crispy) branches at ground level. Depending on how much damage is done, you may have some bare areas but over time they may fill back in with new growth.

https://extension.colostate.edu/resource/spider-mites/

Karin


Weld County Colorado Master Gardeners Replied August 07, 2026, 2:23 PM EDT

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