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Have a Caddisfly Problem?


The Caddisfly is a small, winged insect that lives and breeds near freshwater streams and lakes. The Caddisfly is closely related to butterflies and moths and may be mistaken for a moth. Adults have two pair of wings and a pair of antennae that can be twice the length of the body.

The female Caddisfly will lay eggs or next to fresh water where they remain until the larvae hatch. The larvae remain underwater until they emerge as adults. Newly hatched adults often swarm close enough to the water that fish can eat them. The Caddisfly is a favorite lure of fisherman as bait for trout.

The Caddisfly is attracted to bright lights and the adults may become a nuisance when they swarm to lights at night.


Brown to black


up to 1”


Adult caddisflies are commonly 3 to 15 millimetres (0.118 to 0.590 inch) in length. Their anterior wings usually range from 4 to 20 millimetres in length, providing wing spans of 8 to 40 millimetres.

Control Advice

Use to yellow ‘bug’ lights in outdoor lighting areas to discourage Caddisflies from swarming around lights at night. Use a vacuum to remove Caddisflies that come inside.

Active Seasons

The Caddisfly is most active in spring and summer.

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