A psorosis-like agent prevalent in Florida's grapefruit groves and budwood sources. | Powell, C. A., Pelosi, R. R., Sonoda, R. M., Lee, R. F.

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Title: A psorosis-like agent prevalent in Florida's grapefruit groves and budwood sources.
Personal Authors: Powell, C. A., Pelosi, R. R., Sonoda, R. M., Lee, R. F.
Author Affiliation: University of Florida, IFAS, Indian River Research and Education Cener, Fort Pierce 34945-3138, USA.
Editors: No editors
Document Title: Plant Disease

Abstract:

Rio Grande gummosis (RGG) is one of the most serious diseases of grapefruit in the Indian River region of Florida, USA. 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. Trees in 5 commercial Ruby Red grapefruit groves in the Indian River region, Fort Pierce, Florida were tested. Indexing data from indicator plants (Orange cv. Madam Vinous and grapefruit cv. Duncan) 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. It is concluded that Florida's grapefruit propagation sources are contaminated with a PLA that is now widespread in commercial plantings.

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