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The cotton bollworm is very variable in both size and colour. The body length varies between 12 and 20 millimetres (1⁄2 and 3⁄4 in) with a wingspan of 30–40 millimetres (1+1⁄4–1+1⁄2 in). The fore wings are yellowish to orange in females and greenish-gray in males, with a slightly darker transversal band in the distal third.[6] The external transversal and submarginal lines and the reniform spot are diffused. The hind wings are a pale yellow with a narrow brown band at the external edge and a dark round spot in the middle.[5]