Green Sedge Caddis

Description
Overview: The Green Sedge Caddis (Rhyacophila angelita), also known as the Green Rock Worm or Olive Caddis, is a large caddisfly species found in cold, fast-flowing streams and rivers, particularly in the northern United States and parts of Canada. These caddisflies are notable for their vibrant green coloration, which is reflected in both their nymph and adult stages. They are most active during late spring to early summer, typically hatching when water temperatures range from 50–58°F. The Green Sedge is important to anglers due to its large size and the consistent hatches it produces, providing a reliable food source for fish during the hatching period. Common hook sizes for imitating the Green Sedge Caddis typically range from 10 to 14.
Nymph: The Green Sedge Caddis nymph is a large and robust insect, measuring approximately 1 inch in length. It has a distinct green, brown, or olive-colored body with a well-developed thorax and a segmented abdomen. The nymphs are typically found clinging to rocks and submerged vegetation in fast-moving streams, where they construct protective cases made from small stones or debris. These nymphs are active feeders, often crawling along the substrate before transitioning into their pupal and adult stages. Common hook sizes for Green Sedge Caddis nymph patterns are typically 10 to 14.
Dry/Dun/Spinner: The adult Green Sedge Caddis, or dun, measures about 1 inch in length and has a greenish body with large, translucent wings that often appear slightly grayish or pale. The Green Sedge dun typically emerges in late spring to early summer, and its hatches are often triggered by water temperatures between 50–58°F. These caddisflies usually hatch in moderate numbers, but the size and visibility of the insect make it a prime target for fish. The adult's wings are held upright or tent-like over the body when resting. Hook sizes for dry flies typically range from 10 to 14.
Hatch Chart
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