IPM reduces insecticide applications by 95% while maintaining or enhancing crop yields through wild pollinator...

Area of Science:

• Agricultural Science
• Ecology
• Entomology

Background:

• Modern agriculture often uses insurance-based insecticides, like neonicotinoids, which harm beneficial insects and reduce ecosystem services.
• Conventional management (CM) practices struggle to conserve beneficial invertebrates due to broad-spectrum insecticide use.

Purpose of the Study:

• To compare integrated pest management (IPM) using pest thresholds with standard conventional management (CM).
• To evaluate the impact of IPM on pest populations, pollination, crop yields, and profitability in a dual-crop system (corn and watermelon).

Main Methods:

• A 4-year field experiment across multiple Midwestern US sites compared IPM and CM in commercial-scale fields.
• The study integrated corn production with pollinator-dependent watermelon, measuring pest levels, pollination, yields, and profitability.

Main Results:

• IPM resulted in 95% less insecticide use compared to CM, with pests rarely reaching economic thresholds.
• IPM corn yields were unaffected by the absence of neonicotinoid seed treatments.
• IPM watermelon showed a 129% increase in wild bee visitation, leading to a 26% yield increase.

Conclusions:

• Integrated pest management (IPM) effectively reduces insecticide reliance and enhances crop yields by leveraging ecosystem services, particularly wild bee pollination.
• Redesigning cropping systems with IPM can maintain or improve yields while conserving beneficial insects.
• Wild bees, not managed honey bees, were key to the observed yield benefits in IPM systems.