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Open Access Publications from the University of California

First report on citrus dry rot in sour orange rootstock in Texas


A grapefruit tree on sour orange rootstock in a residential property in Mission, TX was suspected to have citrus dry root rot disease based on symptoms. The causal organism was isolated from the infected root samples and based on fungal cultural and microscopic morphology and PCR, it was confirmed to be Fusarium solani (Martius) Appel & Wollenweber emend. Snyder & Hansen. A total of 10 healthy sour orange rootstock seedlings were inoculated using conidial suspension of the fungus by the standard root-dip method. After 9 month post inoculation, the inoculated fungus was re-isolated from root and stem sections of these plants. Plants were smaller in size and displayed the classical symptoms of dry rot. The fungal colonies were confirmed to be F. solani based on fungal morphology and PCR. This is the first report of F. solani infecting sour orange rootstock plants in Texas.

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