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A Psorosis-Like Agent Prevalent in Florida's Grapefruit Groves and Budwood Sources

February 1998 , Volume 82 , Number  2
Pages  208 - 209

C. A. Powell , R. R. Pelosi , and R. M. Sonoda , University of Florida, IFAS, Indian River Research and Education Center, Fort Pierce 34945-3138 ; and R. F. Lee , University of Florida, IFAS, Citrus Research and Education Center, Lake Alfred 33850-2299

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Accepted for publication 10 October 1997.

Rio Grande Gummosis (RGG) is one of the most serious diseases of grapefruit in the Indian River region of Florida. Experiments were conducted to determine if a graft-transmissible agent was associated with this disease in commercial grapefruit, and if any such agent was present in scion sources used for grapefruit propagation. Indexing data from indicators revealed that 79% and 31% of the commercial grapefruit and scion trees, respectively, contained a psorosis-like agent (PLA). The PLA was present in both RGG-affected and symptomless trees. We conclude that Florida's grapefruit propagation sources are contaminated with a PLA that is now widespread in commercial plantings.

© 1998 The American Phytopathological Society