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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 > Roseslug

Roseslug
Photo Credit: Jeff Hahn Roseslug
Photo Credit: Jeff Hahn

Roseslug
Endelomyia aethiops
Size: Up to ½ inch long

Where/When: Feeds on the upper surface of rose leaves between the veins. Active from mid May through June.

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