Helicoverpa zea

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Helicoverpa zea larva on maize ear (click on image to enlarge it)
Author(s): Sturgis McKeever, Georgia Southern University
Source: IPM Images

Helicoverpa zea (Boddie, 1850) - (American cotton bollworm)

This moth is regarded as an economically important pest in the Americas, infesting crops like maize, cotton, soybean, vegetables and many other crops. The host range also includes some weeds. However, in North America, the impact on grain yield and quality of maize appears to be small (Bibb et al., 2018).

The insect does not overwinter in areas above ~40° latitude in North American, but regularly invades these areas by migration. The caterpillars feed mainly on buds and developing fruits, but may also bore into the whorls or stems. The development from egg, through 5-6 larval stages to mature adult lasts 3-8 weeks, depending on the temperature. Correspondingly, the number of generations per year ranges from 1 to 5 or more.

Vernacular names
• Deutsch: Amerikanischer Baumwollkapselwurm
• English: American cotton bollworm
corn earworm
tomato fruitworm
• Español: gusano de las cápsulas del algodón
• Français: ver de la capsule du cotonnier
ver de l'épi du maïs
• Português: lagarta-das-espigas
broca-grande-do-fruto
lagarta-da-espiga-do-milho

The caterpillars have a variable color from light green to dark brown. Usually there is a dark band along each side, followed by a lighter, more ventrally located band. The adult has a wingspan of about 4 cm. The forewings are brownish, often with a central dark spot and a broad darker band across the apical half of the wing.

Helicoverpa zea is very similar in morphology and biology to the old world species Helicoverpa armigera. Both species can interbreed.

Synonyms:
Heliothis stombleri
Heliothis zea

For a review see Reay-Jones (2019).