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occurrence and characterization of a phytophthora sp. pathogenic to asparagus (asparagus officinalis) in michigan.a homothallic phytophthora sp. was recovered from asparagus (asparagus officinalis) spears, storage roots, crowns, and stems in northwest and central michigan in 2004 and 2005. isolates (n = 131) produced ovoid, nonpapillate, noncaducous sporangia 45 microm long x 26 microm wide and amphigynous oospores of 25 to 30 microm diameter. mycelial growth was optimum at 25 degrees c with no growth at 5 and 30 degrees c. all isolates were sensitive to 100 ppm mefenoxam. pathogenicity studies confirmed th ...200818943453
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