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Association of seed-borne Fusarium species on Pinus ponderosa with germination and seedling viability in Argentina

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Pinus ponderosa seedlots from eight seed orchards in Western Patagonia, Argentina, were evaluated for the presence of Fusarium species, and isolates obtained were subjected to pathogenicity tests. The following species were isolated: Fusariumoxysporum, Fusarium equiseti, Fusarium verticillioides, Fusarium incarnatum, Fusarium acuminatum, Fusarium graminearum and Fusarium proliferatum. With the exception of F. proliferatum and F. graminearum all Fusarium species were recovered from P. ponderosa seedlings with symptoms of damping-off. Five Fusarium species were re-isolated from necrotic roots of seedlings showing chlorosis (F. oxysporum, F. equiseti, F. incarnatum, F. acuminatum and F. verticillioides). High damping-off losses occurred in Fusarium-contaminated seed of P. ponderosa and low disease incidence occurred on less contaminated seed. The role of seed-borne inoculum in disease spread within forest nurseries is discussed.
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Document Type: Research Article

Affiliations: 1: Centro de Investigaciones de Suelos y Aguas de Uso Agropecuario (CISAUA), Facultad de Ciencias Naturales y Museo, UNLP, La Plata, Buenos Aires 2: Centro de Investigaciones de Fitopatolog√≠a (CIDEFI-CIC), Facultad de Ciencias Agrarias y Forestales, UNLP, 60 y 119 CC31 (1900) La Plata, Buenos Aires, Argentina., Email: [email protected]

Publication date: 2007-08-01

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