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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - 1/4 inch - 1/2 inch long > Bristly roseslug

Bristly roseslug

Cladius difformis

Bristly roseslug

Jeff Hahn


Size: Up to 1/2 inch long

Where/When: Feeds on the surface of rose leaves between the veins. Older larvae chew holes. Active from mid May through early September.

Significance: Feeding produces windowpane or lacey appearance to leaves, eventually causing damaged areas to turn brown. Entire parts of the leaves are also eaten. Feeding affects the appearance of roses but rarely impacts their health.

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