2019
Should There Be a Different Corn Earworm Threshold for Determinate and Indeterminate Soybean Varieties?
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Contributor/Checkoff:
North Carolina Soybean Producers Association
Category:
Sustainable Production
Keywords:
Biotic stressCrop protectionField management Pest
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Dominic Reisig, North Carolina State University
Co-Principal Investigators:
Project Code:
19-122
Contributing Organization (Checkoff):
North Carolina Soybean Producers Association
$41,000
Institution Funded:
North Carolina State University
$41,000
Brief Project Summary:

Indeterminate soybean varieties are being increasingly produced across North Carolina. Corn earworm is almost always the most economically damaging insect for soybeans in North Carolina. The thresholds developed for managing this pest were developed with determinate soybean varieties, and previous work across the U.S. indicates that corn earworm management thresholds may vary between determinate and indeterminate varieties. This research seeks to determine if corn earworm thresholds should be adjusted for the indeterminate soybean varieties now being produced more widely across the state. The work provides foundational management information for corn earworm in indeterminate soybean varieties and will be part of comprehensive management recommendations targeting indeterminate soybean varieties.

Key Beneficiaries:
#agronomists, #extension agents, #farmers
Unique Keywords:
#corn earworm, #insect, #insect control, #insects and pests
Information And Results
Final Project Results

Our objectives were to 1) determine if corn earworm thresholds should be different between determinate and indeterminate soybean varieties and 2) to measure potential mechanisms of compensation for both determinate and indeterminate soybean varieties to corn earworm feeding. We had a range of pressure across locations during 2019 and determined that the varieties in our experiment had equal genetic yield potential in the absence of corn earworm pressure. In one location, corn earworm numbers were sufficient to significantly impact yield. Future analyses will be conducted to compare the relationship of corn earworm numbers over time with yield and yield components to see if the varieties compensate for yield loss differently.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.