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Figure

Key Identifying Characteristics of Cotton Bollworm and Tobacco Budworm*

A) Cotton Bollworm spines are absent on tubercles on eighth abdominal segments; no large tooth (retinaculum) present on mandible.
B) Tobacco Budworm has short spines present on tubercles on top of eighth abdominal segment and a large tooth (C) usually present on inner side of mandible, but it may be worn or broken.

*Note: It is not possible to distinguish tobacco budworm from cotton bollworm reliably before the third instar.

Adapted from Integrated Pest Management for Cotton in the Western Region of the United States, 2nd ed., Univ. Calif. Agric. Nat. Res. Publ. 3305.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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