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Integrating Host Resistance and Organic Amendments in a Non-chemical Approach to Managing Macrophomina Crown Rot in Strawberries

Jonathan Winslow: Strawberry Center, California Polytechnic State University

<div>Macrophomina crown rot, caused by the soilborne fungus <em>Macrophomina phaseolina</em>, is an economically impactful pathogen in strawberry production worldwide. When established, the pathogen can cause extensive plant decline and mortality. In the absence of methyl bromide fumigation, new methods for managing crown rot are needed. In order to examine the combination of strawberry host resistance and organic amendments as an integrated approach for the control of Macrophomina crown rot<em>,</em> a greenhouse experiment was conducted in the fall of 2017. A total of six strawberry cultivars, three resistant (Petaluma, Del Rey, and Fronteras) and three susceptible (Monterey, Albion, and Festival), were grown in inoculated field soil treated with anaerobic soil disinfestation-rice bran, brassica seed meal, and steam, and included a non-amended control. Soil inoculum levels of <em>M. phaseolina </em>were reduced by 99, 70, and 65 percent in ASD-rice bran, brassica seed meal, and non-amended treatments respectively. Preliminary results will be presented.</div>