First Report of Lasiodiplodia theobromae Associated with Stem Blight of Southern Highbush Blueberries in Florida

Stem blight of southern highbush blueberries has been attributed to Botryosphaeria dothidea (2). Symptoms include necrotic branches with attached leaves and brown discoloration of the vasculature extending the length of the affected branch. A 2007 field survey of stem blight in Florida resulted in i...

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Veröffentlicht in:Plant disease. - 1997. - 93(2009), 9 vom: 13. Sept., Seite 962
1. Verfasser: Wright, A F (VerfasserIn)
Weitere Verfasser: Harmon, P F
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2009
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article
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520 |a Stem blight of southern highbush blueberries has been attributed to Botryosphaeria dothidea (2). Symptoms include necrotic branches with attached leaves and brown discoloration of the vasculature extending the length of the affected branch. A 2007 field survey of stem blight in Florida resulted in isolates of the previously reported B. dothidea and Neofusicoccum ribis and isolates of unreported Lasiodiplodia theobromae (2). Isolates of L. theobromae were identified to species level by morphological characterization (3). Identity was confirmed by comparison of rDNA sequences of representative isolates (GenBank Accession No. FJ882072) to reference sequences (99% similarity to Accession No. EF622074) (1). Seven, fresh, pruning wounds on southern highbush blueberries cv. Misty were inoculated with a 10-mm V8 juice agar plug of isolate MixFC-6 taken from the margin of a 3-day-old colony. Seven wounds were inoculated with a sterile agar plug. All plugs were attached to the wounds with Parafilm. Mean lesion length 14 days after inoculation was 8.6 ± 2.4 cm. The pathogen was reisolated from the margin of lesions and identified by colony growth characteristics on potato dextrose agar. No lesions were observed on control plants. To our knowledge, this is the first report that stem blight of southern highbush blueberries in Florida can be caused by L. theobromae. References: (1) A. Alves et al. Fungal Divers. 28:1, 2008. (2) F. L. Caruso and D. C. Ramsdell. Compendium of Blueberry and Cranberry Diseases. The American Phytopathological Society, St. Paul, MN, 1995. (3) P. W. Crous et al. Stud. Mycol. 55:235, 2006 
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