Optimizing Aerial Application Parameters for Increased Deposition on Wheat Heads

by

Bradley K Fritz

Contact: Bradley K Fritz  email:  bfritz@apmru.usda.gov

Summary:

Fusarium head blight (FHB) is a major disease of wheat and barley in several grain production regions in the U.S., for which cultural practices, resistant cultivars, and fungicides have had limited effectiveness and erratic results.  Fungicide applications can suppress FHB but thorough coverage of the wheat head must be achieved.  Spray deposition on wheat heads and artificial targets close to the wheat heads was investigated using six aerially applied treatments spanning two droplet sizes and three spray rates.  Generally, lower spray rates along with larger droplet sizes resulted in greater tracer deposits across all sampling media.

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