Wiseana umbraculata, also known as the bog porina, is a species of moth belonging to the family Hepialidae.

[2] Bog porina occur throughout New Zealand; however, they are uncommon in the northern half of the North Island.

Very hot, dry weather can decimate young porina populations, especially in short open pastures.

[6] Adult porina moths mate as soon as they emerge from the soil after completing the larval stage.

They sever grass and clover leaves at the base of the plant and drag them back to their burrow to consume.

Porina numbers are strongly influenced by diseases from naturally occurring pathogens in pasture.

[4] Under natural conditions, the Wiseana nucleopolyhedrosis virus can cause larval mortalities of up to ninety percent.

[7] At the larval stage, porina will concentrate their foraging behaviours as close to the burrow entrance as possible.

[9] Heavy stocking and close grazing in the summer can reduce the survival of eggs and larvae.