DEVELOPING A BASE-LINE DATA SET OF WESTERN CORN ROOTWORM POPULATIONS IN CORN PRODUCTION SYSTEMS IN OHIO (FRINGE AREA).
EXT EDUCATOR/Assistant Professor
The Ohio State University
~~Western corn rootworm (WCR), Diabrotica virgifera virgifera, is an important pest of corn (Zea mays) in the US Corn Belt. WCR management tools include rotation, soil insecticides, seed treatments, and most recently, genetically modified (GM), rootworm-resistant corn hybrids. GM hybrids were rapidly adopted, however resistance to at least one GM-resistance source (Cry3Bb1) has already developed in Central Corn Belt production fields (Focus Area). The goal of this project was to establish current base-line population levels of WCR in corn production fields under various management practices before resistant populations of WCR develop in Ohio (Fringe Area). On-farm production fields (N=40) were sampled for 6-8 weeks (9 Jul.-6 Sep. 2013). Corn production systems were described as: 1) first-year corn following soybeans planted with rootworm-resistant corn hybrids (1GMRW); 2) first-year corn following soybeans planted with non-rootworm-resistant corn hybrids (1NONGM); and 3) continuous corn planted with rootworm-resistant corn hybrids (CONTGM). Six Scentry Multigard yellow sticky traps were deployed into each field at a minimum of 60' from any field edge and 100' between each trap. Traps were replaced weekly and the numbers of WCR beetles were recorded for each trap. WCR emerged in all the corn production systems and were captured throughout the trapping period. Significant differences existed between the mean total numbers of WCR captured per field during a common 6-week trapping period (1GMRW: 247 (range = 39-529) beetles, 1NONGM: 1,251 (range = 182-4,581) beetles, and CONTGM: 3,307 (range = 93-9,325) beetles) (ANOVA; P<0.001). Levels of resistance may already exist in Ohio.
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Authors: C.E. Young
Young, C. EXT EDUCATOR/Assistant Professor, The Ohio State University, Ohio, 45891