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Susceptibility of Landscape Palms to Fusarium oxysporum f.sp. canariensis under Nitrate and Ammoniacal Fertilization

Tuesday, July 31, 2012: 3:15 PM
Balmoral
A. James Downer , Cooperative Extension, University of California, Ventura, CA
Donald R. Hodel , University of California, Los Angeles, CA
Deborah M. Mathews , Plant Pathology and Microbiology, University of California, Riverside, Riverside, CA
Dennis R. Pittenger , Cooperative Extension, Riverside, CA
Five common landscape palms, Phoenix canariensis Chabaud, P. dacytlifera L., P. reclinata Jacq., P. roebelinii O'Brien, and Washingtonia filifera (Linden ex Andre) H. Wendl. ex de Bary were planted in random blocks in a field that had been previously (25 y prior) infested with the pathogen that causes wilt in P. canariensis, Fusarium oxysporum f.sp. canariensis. Random blocks containing each palm were fertilized with nitrate, ammonium, a blend of nitrate and ammonium, a "palm-special" fertilizer, or unfertilized. Mortality counts and growth rates were recorded over the next two years. Fusarium oxysporum f.sp. canariensis attacked P. canariensis, P. reclinata, and W. filifera while P. dactylifera and P. roebelinii were not attacked. Fertilizer treatments had no effect on disease development.
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