Persectania aversa, commonly known as the southern armyworm, is a moth of the family Noctuidae. It was first described in 1856 by Francis Walker. It is endemic to New Zealand and can be found throughout the country including the North, South, Stewart and Chatham Islands. This species inhabits open grasslands. Larvae feed on grass species including commercial crops such as oats and barley and as a result this species is regarded as an agricultural pest. Adults are nocturnal and are attracted to light. They are on the wing throughout the year.

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