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Pest Information



  • Latin Name: Plecoptera
  • Common Name: Stoneflies
  • Latin Family Name: Plecoptera - Order
  • Other Names: Salmon flies

Pest Details



An Order of common native insects in North America, with around 470 species in 10 families.


These medium to large insects undergo simple metamorphosis, with the nymph stage (“naiad”) living in water, where some species feed on small insects while others feed on algae, bacteria, or vegetative matter. They are most commonly found in creeks with rapidly flowing water and rocky bottoms, where they hide under the rocks. The larvae are an important food resource for fish. The adult insect has well developed wings, but is a poor flyer and remains near the aquatic habitat it came from. They may also be attracted to lights at night. These insects are harmless to people, and some species do not feed as adults, resulting in very short life spans.


The nymph stage will be seen only when disturbed by removing rocks from creek beds. It has 3 pairs of very long legs and a pair of long anal bristles. Adults are characterized by the large, soft wings that are held folded over the abdomen when at rest. Colors are generally drab brown or gray. There are 3 pairs of very long legs and a pair of very long antennae. The tarsi have only 3 segments, separating stoneflies from some other similar insect groups.

Characteristicts Important to Control:

Control is not necessary for stoneflies. They are beneficial insects in the environment. If they are present in a structure they can be removed by hand or with a vacuum, and steps should be taken to prevent their ability to fly in. Exterior lights around doorways should be changed to yellow bulbs or turned off at night when not needed.

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