Neonicotinoid Seed Treatments in North American Row Crops: A Literature Review of Yield and Profitability Outcomes

The review finds that neonicotinoid seed treatments (NSTs) often fail to provide statistically significant increases in yield or profitability for North American farmers, particularly in colder regions like the Midwest and Northern U.S. where early-season pest pressure is lower. While some positive returns on investment (ROI) were observed in the U.S. South due to milder winters and higher pest pressure, these results were inconsistent year-to-year. The document highlights significant ecological harms, including the reduction of predator insect populations, damage to pollinators, and disruption of soil decomposition. It argues that a shift from prophylactic use to an 'assess-and-decide' approach based on actual pest pressure would save farmers money without reducing yields.

• Neonicotinoid seed treatments (NSTs) frequently do not improve crop yields or farmer profitability because pest pressure is often insufficient to justify their economic cost.
• The effectiveness of NSTs varies by geography; colder winters in the Midwest and Northern U.S. reduce early-season pest pressure, making treatments less valuable compared to the U.S. South.
• In the U.S. South, NSTs for corn, soy, and cotton showed an average positive return on investment (ROI), though this was inconsistent across different years.
• NSTs can negatively impact yields by harming non-target predator insects that control pests; for example, in Pennsylvania soy fields, NSTs reduced predatory beetles that eat slugs, leading to lower yields.
• The use of NSTs can decrease yields for crops dependent on pollinators, such as sunflowers and melons, by harming the pollinators themselves.
• NSTs have a limited efficacy window, typically two to three weeks after planting, meaning they do not protect against late-season pests like grasshoppers and stinkbugs.
• Prophylactic use of neonicotinoids on corn and soy fields has been found to reduce the populations of decomposer insects and decrease leaf litter decomposition by 10%.
• Some evidence suggests NSTs may alter plant physiology in ways that increase vulnerability to secondary pests, such as spider mites and fall armyworm.
• Farmers could reduce operating costs without sacrificing yield by switching from default prophylactic use to an integrated pest management (IPM) approach based on pest monitoring.
• Market constraints, specifically seed companies making it difficult to source non-treated seeds with high-demand genetics, contribute to the overuse of NSTs.

APA

WWF International (2026). Neonicotinoid Seed Treatments in North American Row Crops: A Literature Review of Yield and Profitability Outcomes. https://www.worldwildlife.org/documents/2371/WWF_Neonic_lit_review_2026.pdf

Chicago

WWF International. Neonicotinoid Seed Treatments in North American Row Crops: A Literature Review of Yield and Profitability Outcomes. 2026. https://www.worldwildlife.org/documents/2371/WWF_Neonic_lit_review_2026.pdf.

Wikipedia

{{cite report |author=WWF International |title=Neonicotinoid Seed Treatments in North American Row Crops: A Literature Review of Yield and Profitability Outcomes |date=2026 |url=https://www.worldwildlife.org/documents/2371/WWF_Neonic_lit_review_2026.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{wwfinternational2026neonicotinoid, author = {{WWF International}}, title = {{Neonicotinoid Seed Treatments in North American Row Crops: A Literature Review of Yield and Profitability Outcomes}}, institution = {WWF International}, year = {2026}, url = {https://www.worldwildlife.org/documents/2371/WWF_Neonic_lit_review_2026.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }