Ants on our property (Chaya, Montana, USA)


Hello,

I've always thought red and black ants were carpenter ants but I cannot find any picture of a carpenter ant that looks like these--and my land is crawling with them. We do have black carpenter ants on our porch (most unfortunately), and these are something else entirely.

Could you identify these for me? Is there anything I need to do to keep them in check within my ecosystem, and what natural controls would be optimal?

Thank you,

Chaya

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Hi Chaya,

Carpenter ant is the common name for ants in the genus Camponotus, but the ants on your land are wood ants in the genus Formica. We have a few previous posts that mention these ants here and here. Wood ants are native to North America and play an integral part in your local ecosystem by clearing away other insects and harvesting fallen pine needles for their nests. They are relatively harmless and do not normally require special control measures unless you find them to be excessively bothersome. They often change the location of their colonies so you may notice their numbers vary over time, even without any outside influence. Many wood ants can also construct large thatch mounds like the one shown here:

FormicaObscuripesNest-M.jpg Photograph courtesy of alexanderwild.com

Thanks for being concerned about your backyard ecosystem!

Ben Rubin, Alexandra Westrich & the AntAsk Team

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