Advantages of Using Corn Products with SmartStax® Technology for Rootworm Protection - MN

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Trial Overview

Corn rootworm (CRW) (Diabrotica virgifera) causes significant annual yield losses. Management strategies include: crop rotation to a non-host crop, scouting, insecticide applications, and corn product selection. The use of dual mode of action corn products for CRW protection can be more effective than using a soil-applied insecticide (SAI) on a corn product without Bacillus thuringiensis (B.t.) CRW protection.

Research Objective

  • To evaluate the advantages of using a dual-mode B.t. CRW protected corn product, such as products with SmartStax® Technology.
  • To evaluate the influence of SAI for CRW protection.
Location Soil Previous
Crop
Tillage
Type
Planting
Date
Harvest
Date
Planting
Rate/Acre
Benson, MN Silty Clay Loam Corn Conventional 05/06/2017 10/26/2017 32,000
Luverne, MN Silty Clay Loam Soybean Conventional 05/08/2017 10/24/2017 36,000
Luverne, MN Silty Clay Loam Soybean Conventional 05/08/2017 10/24/2017 36,000
Rushmore, MN Silty Clay Loam Soybean Conventional 05/09/2017 10/20/2017 36,000
Rushmore, MN Silty Clay Loam Soybean Conventional 05/09/2017 10/20/2017 36,000
Svea, MN Silty Clay Loam Corn Conventional 04/27/2017 10/27/2017 36,000
Benson, MN Silty Clay Loam Soybean Conventional 05/02/2017 10/27/2017 36,000
Cosmos, MN Silty Clay Loam Soybean Conventional 05/12/2017 11/06/2017 36,000
Mapleton, MN Silty Clay Loam Soybean Conventional 05/08/2017 10/24/2017 36,000

SITE NOTES:

Trials were conducted in a strip plot design with one replication conducted at 9 locations or environments. Each location was considered a replication or environment in the analysis of the data.

Understanding the Results

 
Figure 1. Average Yield of VT Double PRO® and SmartStax® products with and without insecticide for all locations.
 
Figure 2. Average Yield of VT Double PRO® and SmartStax® products with and without insecticide for locations with high CRW infestation.
 
Table 1. Summary of trial findings over 9 Minnesota locations.*

What Does This Mean for Your Farm?

  • The summary data shows that the average advantage of SmartStax® Technology is about 7.0 bu/acre over all locations and 13.3 bu/acre on sites with high CRW pressure. The average economic advantage considering all locations and locations with high CRW pressure, with a corn price of $3.00/bu equals $21.00/acre and $39.90/acre, respectively. In the case where a seeding rate of 35,000 seeds/acre was used, a unit of seed (80,000 kernels) would cover approximately 2.25 acres.
  • The increased value of SmartStax® Technology equates to approximately $50-90+ per unit of seed compared to VT Double PRO® Technology. Considering the average differential in cost between SmartStax® Technology and VT Double PRO® Technology (using Zone 2 pricing) is approximately $50-55, the advantage of using SmartStax® Technology vs. VT Double PRO® Technology exceeds the investment by an average of $25/acre.