Abstract
Abstract Water injection tests and analysis of the outer trunk wood for Zn, K, Mg, CI, and water-soluble phenolics of trees declining of declinamiento or fruta bolita (Argentina), marchit-amiento repentino (Uruguay), declinio (Brazil), and an unnamed decline in South Africa showed that these trees behave like blight-affected trees in Florida. Water uptake of declining trees is reduced, and Zn, K, Mg, and CI levels in the wood are usually higher than in healthy trees. Trees of ‘Valencia’, ‘Westin’, ‘Tarocco’, ‘Calderon’, ‘Natal’, ‘Alidjan’, and ‘Washington navel’ sweet oranges (Citrus sinensis (L.) Osbeck), ‘Eureka’ and ‘Lisbon’ lemons (C. limon (L.) Burm. f.), ‘Marsh’ grapefruit (C paradisi Macf.), and ‘Comun’ mandarin (C. reticulata Blanco) on trifoliate orange (Poncirus trifoliata (L.) Raf.), rough lemon (C. limon), Cleopatra mandarin (C. reticulata), and Rangpur (C. reticulata hybrid) rootstocks were used in this study.
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