Corn Rootworm Protection Efficacy of Pioneer® Brand Qrome® Products
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Objective
- Research trials were conducted in 2014, 2015, and 2016 to evaluate corn rootworm (CRW) protection efficacy of Pioneer® brand Qrome® products under various levels of CRW feeding pressure.
Study Description
Years: 2014, 2015, 2016
Locations: 11 in 2014, 15 in 2015, 14 in 2016; research locations in IA, IL, IN, MN, NE, SD, and WI
Plot Layout: Small research plots, 4 rows each
Replications: 3 per location
Hybrid Platforms: 4 or 5 per location
Insect Protection Technologies – Pioneer brand products:
Qrome products*
CRW non-protected check (HX1, LL, RR2)
- Evaluated CRW feeding damage on 5 plants per plot.
- Samples did not exclude refuge plants.
- CRW feeding damage rated using the Iowa State 0-3 node injury score (Oleson et al., 2005).
- Research locations were selected and managed specifically to create high CRW pressure environments, with some sites utilizing trap crops and/or manual CRW infestations.
Site Characterization
- Research locations were categorized as having low, moderate or high CRW feeding pressure based on the average CRW node injury in the CRW non-protected check:
Low: 0 - 0.75
Moderate: 0.75 - 1.75
High: 1.75 - 3.00
Results
- Across all three years of the study, a total of 24 locations had moderate to high CRW pressure (0.75 - 3.00) The average CRW node injury score of the CRW non-protected check was 1.63 across these 24 locations (Figure 1).
- Qrome products had excellent CRW protection efficacy over the three years of the study, with an average CRW node injury score of 0.32 at moderate and high CRW pressure locations.
Figure 1. Average CRW node injury for Qrome products and the non-protected check at moderate and high CRW pressure locations, 2014-2016. N = 24 locations with ~1700 observations/treatment.
See your local Pioneer sales representative to better understand which products make sense on your farm.
A decrease of susceptibility to certain technology traits in corn has been observed in some CRW populations, which may result in lower efficacy than depicted in this chart. Please contact your authorized Pioneer sales representative or consult with your local University Extension for more information regarding insect resistance management guidelines, best management practices, and to understand whether there has been insect resistance documented in your area.
*Pioneer® brand Qrome® products will not be offered for sale or distribution until completion of field testing and applicable regulatory reviews.
Oleson, J.D., Y. Park, T.M. Nowatzki, and J.J. Tollefson. 2005. Node-injury scale to evaluate root injury by corn rootworms (Coleoptera: Chrysomelidae) J. Econ Entomol. 98(1): 1-8.
Authors: Alejandra Pascual, Mark Jeschke, Murt McLeod, Steven Paszkiewicz, and Tim Nowatski
The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. 2014-2016 data are based on average of all comparisons made in 24 locations through Oct 31, 2016. Multi-year and multi-location is a better predictor of future performance. Do not use these or any other data from a limited number of trials as a significant factor in product selection. Product responses are variable and subject to a variety of environmental, disease, and pest pressures. Individual results may vary. Pioneer® brand products are provided subject to the terms and conditions of purchase which are part of the labeling and purchase documents.
Q (Qrome®) - Contains a single-bag integrated refuge solution for above- and below-ground insects. The major component contains the Agrisure® RW trait, the YieldGard® Corn Borer gene, and the Herculex® XTRA genes. In EPA-designated cotton growing counties, a 20% separate corn borer refuge must be planted with Qrome products. Qrome® products are approved for cultivation in the U.S. and Canada. They have also received approval in a number of importing countries, most recently China. For additional information about the status of regulatory authorizations, visit www.biotradestatus.com.
Agrisure® is a registered trademark of, and used under license from, a Syngenta Group Company. Agrisure® technology incorporated into these seeds is commercialized under a license from Syngenta Crop Protection AG. Herculex® XTRA insect protection technology by Dow AgroSciences and Pioneer Hi-Bred. Herculex® and the HX logo are registered trademarks of Dow AgroSciences LLC. YieldGard®, the YieldGard Corn Borer design and Roundup Ready® are registered trademarks used under license from Monsanto Company. LibertyLink® and the Water Droplet Design are trademarks of Bayer.