Tropical Plant Pathology (2013) 38, 513-521

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Rafael F. Alfenas, Olinto L. Pereira, Vanessa L. Jorge, Pedro W. Crous and Acelino C. Alfenas (2013)
A new species of Calonectria causing leaf blight and cutting rot of three forest tree species in Brazil
Tropical Plant Pathology 38 (6), 513-521
Abstract: Several species of Calonectria cause diseases on a wide range of forest tree species that are propagated either via seedlings or rooted cuttings. In nurseries these fungi cause damping-off, cutting and root rots, stem lesions, and leaf blights. Recently a Calonectria sp. was isolated from rooted cuttings of Anadenanthera peregrina (Fabaceae), Piptadenia gonoacantha (Fabaceae), and Azadirachta indica (Meliaceae) exhibiting leaf blight and cutting rot in a forest nursery at the Universidade Federal de Viçosa, Brazil. Morphological comparisons and DNA sequences of three loci containing partial gene sequences of ß-tubulin (TUB2), calmodulin (CAL), and elongation factor (TEF-1α) indicated that these isolates represent an unnamed species of Calonectria, described here as C. hodgesii sp. nov. Sprayinoculated plants of all three hosts with a suspension at 1x104 conidia mL-1 induced leaf lesions, cutting rot, and intense defoliation as observed under natural conditions. Calonectria hodgesii was re-isolated from infected tissue, which fulfilled Koch's postulates and confirmed its status as a pathogen with a wide host range.
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Database assignments for author(s): Pedro W. Crous, Acelino C. Alfenas

Research topic(s) for pests/diseases/weeds:
identification/taxonomy


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Calonectria hodgesii Neem (Azadirachta indica) Brazil (south)
Calonectria hodgesii Angico trees (Anadenanthera) Brazil (south)