Insect Protection Technologies for Corn Rootworm Management
- Research trials were conducted in 2013, 2014, and 2015 to evaluate corn rootworm protection efficacy of insect protection technologies available in Pioneer® brand corn products under various levels of corn rootworm feeding pressure.
||2013, 2014, 2015
||9 in 2013
11 in 2014
15 in 2015
Research locations in Iowa, Ill., Ind., Minn., Neb., S. D., and Wis.
||Small research plots, 4 rows each
||3 per location
||4 or 5 per location
|Insect Protection Technologies – Pioneer brand products:
Optimum® AcreMax® XTreme (AMXT)
Optimum® AcreMax® Xtra (AMX)
Optimum® AcreMax® TRIsect® (AMT) with Poncho® 1250 + VOTiVO® insecticide
Corn rootworm non-protected check (HX1, LL, RR2)
- Evaluated corn rootworm feeding damage on 5 plants per plot
- Samples did not exclude refuge plants
- Corn rootworm 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 corn rootworm pressure environments, with some sites utilizing trap crops and/or manual corn rootworm infestations
- Research locations were categorized as having low, moderate or high corn rootworm feeding pressure based on the average corn rootworm node injury in the corn rootworm non-protected check:
||0 - 0.75
||0.75 - 1.75
||High: 1.75 - 3.00
- Across all 3 years of the study, a total of 14 locations had moderate to high corn rootworm pressure (0.75 - 3.00) The average corn rootworm node injury score of the corn rootworm non-protected check was 1.77 across these 14 locations (Figure 1).
Figure 1. Average corn rootworm (CRW) node injury by insect protection technology at moderate and high CRW pressure locations, 2013-2015. N = 14 locations with ~1,000 observations/treatment.
- All corn rootworm protection technologies had excellent corn rootworm protection efficacy, with average corn rootworm node injury scores significantly lower than the non-protected check, ranging from 0.22 to 0.38.
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 corn rootworm 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.
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: Murt McLeod, Steven Paszkiewicz, and Mark Jeschke