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Corn Rootworm Monitoring: 2014 - 2016

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Objective

  • Evaluate and monitor corn rootworm protection of Pioneer® brand corn products with the Herculex® RW (HXRW) trait in the central and northern Corn Belt, specifically targeting fields where HXRW has been used in 2 or more consecutive growing seasons.

Study Descriptions

Years:                      2014, 2015, 2016.
 
Locations:               232 fields in Iowa, Ill., Ind., Minn., Neb., S.D. and Wis.
 
 
Sampling Methods:
  • Targeted fields for sampling with a history of continuous corn and continuous use of HXRW trait (Table 1).
  • All fields were planted with a Pioneer brand corn product with Optimum® AcreMax® 1, Optimum® AcreMax® Xtra, or Optimum® AcreMax® XTreme insect protection in the year that sampling took place.
  • Sampled 10 roots per location (5 2-plant clusters).
  • Roots were washed and corn rootworm injury rated using 0-3 Node Injury Scale (NIS).

Table 1. Locations by state and history of fields sampled for evaluation of corn rootworm protection efficacy in 2014, 2015, and 2016.

Locations by state and history of fields sampled for evaluation of corn rootworm protection efficacy in 2014, 2015, and 2016.

Results

  • Corn rootworm injury was low at all locations in the study; average node injury score rate 0.08 across all 3 years and 232 locations.
  • Corn rootworm injury did not differ based on trait use history (Table 2).

Table 2. Average node injury score (NIS) by field history.

Average corn node injury score (NIS) by field history.

Management Considerations

  • Corn rootworm protection of Pioneer brand corn products with the Herculex RW trait was extremely consistent across all sampling locations in 2014-2016 and was not influenced by trait use history, although corn rootworm populations were generally low across much of the Corn Belt during these growing seasons.
  • Although this study has shown that the HXRW trait remains an effective tool for corn rootworm management, DuPont Pioneer and university research suggests that continuous, uninterrupted use of the same corn rootworm Bt technology can lead to decreased corn rootworm susceptibility to that technology, and may result in reduced product efficacy against these insects. DuPont Pioneer recommends avoiding more than 3 years continuous use of HXRW.
  • To help maintain the efficacy of Bt corn rootworm products, it is essential to develop a multi-faceted rootworm management plan.
  • Your Pioneer sales professional or local Extension professionals can assist you in developing best management practices for your operation.
  • Please contact your Pioneer sales professional or consult with your local University Extension for more information regarding insect resistance management, best management practices and to understand whether there has been insect resistance documented in your area.

 

Pioneer® brand products are provided subject to the terms and conditions of purchase which are part of the labeling and purchase documents. 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 216 locations through Sept 1, 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. 2014-2016 data are based on average of all comparisons made in 216 locations through Sept 1, 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.

 

Related Content

Back to Trials

   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.
  AMX - Optimum® AcreMax® Xtra Insect Protection system with YGCB, HXX, LL, RR2. Contains a single-bag integrated refuge solution for above- and below-ground insects. In EPA-designated cotton growing counties, a 20% separate corn borer refuge must be planted with Optimum AcreMax Xtra products.
          
AMXT (Optimum® AcreMax® XTreme) - 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 Optimum AcreMax XTreme products. HXX - Herculex® XTRA contains the Herculex I and Herculex RW genes. YGCB - The YieldGard® Corn Borer gene offers a high level of resistance to European corn borer, southwestern corn borer and southern cornstalk borer; moderate resistance to corn earworm and common stalk borer; and above average resistance to fall armyworm. LL - Contains the LibertyLink® gene for resistance to Liberty® herbicide. RR2 - Contains the Roundup Ready® Corn 2 trait that provides crop safety for over-the-top applications of labeled glyphosate herbicides when applied according to label directions. Liberty®, LibertyLink® and the Water Droplet Design are registered trademarks of Bayer. YieldGard®, the YieldGard Corn Borer design and Roundup Ready® are registered trademarks used under license from Monsanto Company. Herculex® Insect Protection technology by Dow AgroSciences and Pioneer Hi-Bred. Herculex® and the HX logo are registered trademarks of Dow AgroSciences LLC. 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.
HXRW –The Herculex® RW insect protection trait contains proteins that provide enhanced resistance against western corn rootworm, northern corn rootworm, and Mexican corn rootworm. Herculex® RW Rootworm Protection technology by Dow AgroSciences and Pioneer Hi-Bred. Herculex® and the HX logo are registered trademarks of Dow AgroSciences LLC.