Title: Within and Between Field Dispersal of Diabrotica barberi and D. virgifera virgifera in the South Dakota Areawide Management Site Authors
Submitted to: Meeting Proceedings
Publication Type: Other
Publication Acceptance Date: June 1, 2006
Publication Date: November 7, 2006
Citation: French, B.W., Chandler, L.D. 2006. Within and Between Field Dispersal of Diabrotica barberi and D. virgifera virgifera in the South Dakota Areawide Management Site. Poster presentation at 22nd IWGO Conference, November 5-8, 2006, Vienna, Austria. Technical Abstract: Dispersal is a means by which organisms search for food, shelter, mates, oviposition sites, etc., and can ultimately result in gene flow among populations. We investigated the within and between field movement of Diabrotica barberi Smith and Lawrence and D. virgifera virgifera LeConte (Coleoptera: Chrysomelidae) in the 41.4 km squared South Dakota Corn Rootworm Areawide Management site. These are two economically important pests of maize, Zea maize L., in the U.S. Corn Belt, and D. v. virgifera has become an invasive pest in many countries of Europe. We used emergence cages and Pherocon AM yellow sticky traps to capture these beetles within maize fields, and Pherocon AM yellow sticky traps to capture the beetles between fields of soybean (Glycine max L.), continuous maize, and first-year maize. Diabrotica barberi were captured in high numbers from continuous and first-year maize fields, whereas D. v. virgifera were captured in high numbers only from continuous maize fields. For both species, males began emerging in higher numbers than females early in the season, and then as the season progressed female emergence was greater than male emergence. This capture pattern also is reflected from the sticky traps placed within and between fields. Generally, more beetles of both species were captured between continuous and first-year maize fields then between maize and soybean fields. We discuss our results in relation to corn rootworm biology and areawide pest management.