ST. PAUL, Minn. (AP) - State agriculture officials are recommending an expansion of a proposed emerald ash borer quarantine in northeastern Minnesota.

The state Agriculture Department in September issued an emergency quarantine for the southeastern portion of St. Louis County, after a second infestation of the tree-killing bug was discovered in Duluth.

The agency is now recommending the northeastern corner of Carlton County also be included. A public comment period runs through Jan. 15.

Quarantines limit the movement of firewood and ash material out of an area. Under the proposal, 15 of Minnesota's 87 counties would be fully or partially quarantined for the invasive insect.

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