The NSW government will not attempt to eradicate an exotic bee parasite from the state after it was detected near Tamworth.

The NSW Department of Primary Industries (DPI) said braula fly was found during routine surveillance for varroa mite on hives at its Tamworth Agricultural Institute on January 15.

Once considered a major threat to the commercial beekeeping industry, DPI manager of plant biosecurity, prevention and preparedness Chris Anderson said it was now considered a minor and insignificant pest.

"There's no scientific or economic justification for attempting to eradicate braula fly from NSW," Dr Anderson said.

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