ALFALFA RUST CONTROL AND RESULTANT YIELDS - A COMPARISON OF HEADLINE AND ROUNDUP POWERMAX
Agronomy & Pest Management
Michael Rethwisch
Farm Advisor - Crop Production and Entomology
University of California Cooperative Extension
Blythe
Abstract
Two rates of Headline fungicide (6 & 9 oz./acre) and 44 oz./acre of Roundup PowerMax herbicide were applied with and without surfactant to a field planted with Roundup Ready alfalfa that was infected with alfalfa rust (Uromyces striatus). The field had two growth stages, allowing curative and preventative disease control/prevention data to be obtained. Roundup PowerMax resulted in significantly better disease control and prevention than other treatments. Best yields were noted from alfalfa treated with the 6 oz./acre rate of Headline, followed by the 9 oz./acre rates, and then Roundup PowerMax. Highest quality of alfalfa hay was noted from the Roundup PowerMax and Headline at 9 oz./acre, with these averaging approximately 25 relative feed value (RFV) points higher than untreated alfalfa.
Authors: Rethwisch, M. D.
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Rethwisch, M. D. Extension Educator, University Of Nebraska - Lincoln, Nebraska, 68632