Corn Rootworm Management


  • Determine efficacy and corn yield performance of corn rootworm (CRW) management options in fields with moderate to high CRW pressure.
  • Determine if additional CRW control measures may provide value with Optimum® AcreMax® 1 (AM1) integrated refuge products, in which 90% of seeds include Herculex® XTRA insect protection.

Study Description

Locations:   8 locations in continuous corn with moderate to high CRW pressure
(average NIS score in the nonprotected check > 0.75). See map below.
Replications:   1 per location
Map: Western U.S. Agronomy Research locations.


     Nonprotected check (no CRW control)
     AM1 + high-rate IST (Poncho® 1250)
     AM1 + high-rate IST + in-furrow insecticide (Capture® LFR)
Pioneer® Brand Products:
     AM1 Check
     P0451AM1™  (AM1, LL, RR2) P1151R  (RR2)
     P1151AM1™  (AM1, LL, RR2) P1395R  (RR2)
     P1395AM1™  (AM1, LL, RR2)
     32N74AM1™  (AM1, LL, RR2)
  • 5 roots were sampled per entry for NIS scores.


Chart: NIS scores at moderate-high CRW pressure sites.
  • All CRW control treatments significantly reduced root pruning by CRW larvae compared to the nonprotected check.
  • CRW management options provided similar protection from root damage caused by CRW larvae.
Chart: Corn yield at moderate-high CRW pressure sites.
  • All 3 CRW management options greatly increased yield relative to the nonprotected check.
  • Yield was similar among CRW management options.
  • The addition of a high-rate IST and in-furrow insecticide did not improve efficacy or yield performance with AM1 products under moderate CRW pressure.

PIONEER® products are provided subject to the terms and conditions of purchase which are part of the labeling and purchase documents. 2012 data are based on average of all comparisons made in 20 locations through December 20, 2012. 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. All products are trademarks of their manufacturers.

AM1 - Optimum® AcreMax® 1 Insect Protection System with an integrated corn rootworm refuge solution includes HXX, LL, RR2. Optimum AcreMax 1 products contain the LibertyLink® gene and can be sprayed with Liberty® herbicide. The required corn borer refuge can be planted up to half a mile away.

HXX – Herculex® XTRA contains both the Herculex I and Herculex RW genes. Herculex® XTRA Insect Protection technology by Dow AgroSciences and Pioneer Hi-Bred. Herculex® and the HX logo are registered trademarks of Dow AgroSciences LLC.

LL - Contains the LibertyLink® gene for resistance to Liberty® herbicide.
Liberty®, LibertyLink® and the Water Droplet Design are trademarks of Bayer.

RR2 - Contains the Roundup Ready® Corn 2 trait that provides safety for over-the-top applications of labeled glyphosate herbicides when applied to label directions.
Roundup Ready® is a registered trademark used under license from Monsanto Company.

Poncho® is a registered trademark of Bayer.