Iron toxicity in Pentas lanceolata

Interveinal chlorosis of lower (oldest) leaves followed by development of interveinal necrotic spots, marginal necrosis, downward cupping of leaves, and leaf abscission were symptoms of a disorder commonly observed during production of potted pentas. The disorder was determined to be an Fe toxicity...

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Bibliographic Details
Published in:HortTechnology (Alexandria, Va.) Va.), 1995-10, Vol.5 (4), p.306-307
Main Author: Harbaugh, B.K. (University of Florida, Bradenton, FL.)
Format: Article
Language:English
Subjects:
APPLICATION RATES
CHLOROSE
CHLOROSIS
CLOROSIS
CONTENIDO MINERAL
CULTIVARS
CULTIVO EN CONTENEDOR
CULTURE EN CONTENEUR
DOSE D'APPLICATION
DOSIS DE APLICACION
EXCES DE SUBSTANCE NUTRITIVE
EXCESO DE NUTRIENTES
FER
FITOTOXICIDAD
FLORIDA
FLORIDE
GROWING MEDIA
HIERRO
IRON
MINERAL CONTENT
NECROSE
NECROSES
NECROSIS
NUTRIENT CONTENT
NUTRIENT EXCESSES
NUTRITIVE VALUE
PENTAS
PH DEL SUELO
PH DU SOL
PHYTOTOXICITE
PHYTOTOXICITY
POT CULTURE
SOIL PH
SUBSTRAT DE CULTURE
SUBSTRATOS DE CULTIVO
TENEUR EN ELEMENTS MINERAUX
VALEUR NUTRITIVE
VALOR NUTRITIVO
VARIEDADES
VARIETE
VARIETIES
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Description
Summary:Interveinal chlorosis of lower (oldest) leaves followed by development of interveinal necrotic spots, marginal necrosis, downward cupping of leaves, and leaf abscission were symptoms of a disorder commonly observed during production of potted pentas. The disorder was determined to be an Fe toxicity problem associated with accumulation of extremely high levels of foliar Fe (649 to 1124 ppm). Cultivars varied in their response to soil-applied Fe-DTPA chelate solutions: `Starburst', `Mauve' and `Ruby Red' were very susceptible, `Pink Profusion' was intermediate, and `White', `Lavender Delight', and `Pink Rose' were resistant. Potted plant production in a root medium with an initial pH of 6.7 ± 0.1 and a end pH of 6.4 ± 0.2 reduced the accumulation of foliar Fe to levels ranging from 59 to 196 ppm and prevented development of significant visual symptoms for all Cultivars.
ISSN:1063-0198
1943-7714
DOI:10.21273/horttech.5.4.306