Phrygania grandis, Phrygania striata - Great Red Sedge

Phylum: Arthropoda - Class: Insecta - Order: Trichoptera - Family: Phryganeidae

Great red sedge

The Great Red Sedge is the largest caddis or sedge fly that hatches in the British Isles. These are flies of lakes and slow-flowing rivers, and they hatch on summer afternoons and evenings. In Ireland in particular the common name Murragh is used more often than Great Red Sedge.

The larva makes its case from plant material, which it fashions into a spiral tube. After pupating, the adult emerges and heads for land, where it rests among the stones and low bushes.

Fishing tip

A size 12 G&H sedge is a very effective imitation, and is best dragged across the surface just as darkness is descending.

A good place to try is beside a reed bed or other dense emergent vegetation. This tactic often brings to the surface trout that are mainly cannibal, and so a strong leader is recommended.


O'Reilly, Pat. (1997; 8th reprint 2010) Matching the Hatch. Shrewsbury: Quiller Publishing.

Barnard, P & Ross, E. (2007) A Guide to the adult caddisflies or sedge flies (Trichoptera). Taunton: Field Studies Council.

Wallace, I. (2006) Simple Key to Caddis Larvae. Taunton: Field Studies Council.

Wallace, I.D., Wallace, B., & Philipson, G.M. (2003) Keys to the Case-bearing Caddis Larvae of Britain and Ireland. Ambleside: Freshwater Biological Association.

Macan, T.T. (1973) A Key to the Adults of the British Trichoptera. Ambleside: Freshwater Biological Association.

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