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Related Experiment Videos

Dispersal of boll weevils (Coleoptera: Curculionidae) from cotton modules before ginning.

Thomas W Sappington1, Mark D Arnold, Alan D Brashears

  • 1USDA-ARS, Corn Insect and Crop Genetics Research Unit, Genetics Laboratory, Iowa State University, Ames, IA 50011, USA. tsapping@iastate.edu

Journal of Economic Entomology
|April 1, 2006
PubMed
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The risk of boll weevil (Anthonomus grandis grandis) reintroduction from cotton modules is low, as most weevils die or disperse. Survival is minimal under extreme temperatures, but can increase under tarps in cold weather.

Area of Science:

  • Agricultural Entomology
  • Pest Management
  • Insect Ecology

Background:

  • The boll weevil (Anthonomus grandis grandis) eradication program faces reintroduction risks.
  • Cotton modules are potential sources of boll weevil dispersal during transport.

Purpose of the Study:

  • To assess the risk of boll weevil dispersal from cotton modules during and after transport.
  • To understand the influence of environmental conditions on boll weevil survival and dispersal from modules.

Main Methods:

  • Mark-release-recapture experiments were conducted in Texas.
  • Boll weevils were placed on and under cotton modules under varying temperature conditions.
  • Survival and dispersal rates were monitored over time.

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Main Results:

  • Most boll weevils dispersed from module surfaces when temperatures permitted flight.
  • Survival rates were low on module surfaces, especially at high temperatures (>33°C).
  • Survival was higher under tarps than on open surfaces in both warm and cold conditions, but 100% mortality occurred at 34°C.

Conclusions:

  • The overall threat of boll weevil reintroduction from modules is low.
  • Dispersal risk is highest when modules are transported in cool weather and then exposed to warm conditions at the gin, or transported immediately after construction in moderate to warm weather.