The Colorado potato beetle, also known as the Colorado beetle, the ten-striped spearman, the ten-lined potato beetle or the potato bug, is a dangerous pest of potato crops. It is approximately 10 millimetres (0.39 in) long, with a bright yellow/orange body and five bold brown stripes along the length of each of its elytra. The appearance of these bugs is not unique: the false potato beetle, which is the Colorado beetle's close relative and looks alike, is often taken for the potato bug.

Adult beetles average 6–11 millimetres (0.24–0.43 in) in length and 3 millimetres (0.12 in) in width. The beetles are orange-yellow in colour with ten characteristic black stripes on the elytra. The species name decemlineata, meaning 'ten-lined', derives from this feature. Adult beetles may, however, be visually confused with L. juncta, the false potato beetle, which is not an agricultural pest. L. juncta also has alternating black and white strips on its back, but one of the white strips in the center of each wing cover is missing and replaced by a light brown strip.

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