Characterization of Neofabraea actinidiae and N. brasiliensis as causal agents of apple bull's-eye rot in southern Brazil.

The causal agents of apple bull?s-eye rot in southern Brazil have recently been described as Neofabraea actinidiae and N. brasiliensis. Isolates of both species were evaluated for response of mycelial growth index (MGI) to different temperatures, enzyme production, mycelial growth inhibition and effective concentrations (EC 50 and EC 100 ) of the fungicides tri fl umizole, pyrimethanil and thiophanate methyl, as well as aggres- siveness on fruits of "Fuji " hybrid and " Pink Lady " . There was signi ficantly lower mycelium growth in N. brasiliensis compared with N. actinidiae at all temperatures tested. Neither species grew at 3 and 32°C. There were minor differences in production of enzymes in the two species, with all N. brasiliensis isolates showing no production of pectolyase at pH 7. The lowest EC 50 and EC 100 values were observed with thiophanate methyl. In general, " Fuji " fruits were more susceptible to Neofabraea infection and had larger lesions, while N. brasiliensis isolates showed greater aggressiveness on " Fuji " hybrid and " Pink lady " fruits compared with N. actinidiae.

Bibliographic Details

Main Authors:	BOGO, A., COMPARIN, C. C., SANHIEZA, R. M. V., RITSCHEL, P. S., CASA, R. T., SILVA, F. N., EVERHART, S. E.
Other Authors:	Amauri Bogo, 1Crop Production Graduate Program, Universidade do Estado de Santa Catarina, Av. Luis de Camões, Lages, SC 88520-000, Brazil; Carla C. Comparin, 1Crop Production Graduate Program, Universidade do Estado de Santa Catarina, Av. Luis de Camões, Lages, SC 88520-000, Brazil; Rosa M. Valdebenito Sanhueza, Proterra Research Center, BR 116, 7320, 95.200-000, Vacaria, RS, Brazil; PATRICIA SILVA RITSCHEL, CNPUV; Ricardo T. Casa, Crop Production Graduate Program, Universidade do Estado de Santa Catarina, Av. Luis de Camões, Lages, SC 88520-000, Brazil; Fábio N. Silva, Crop Production Graduate Program, Universidade do Estado de Santa Catarina, Av. Luis de Camões, Lages, SC 88520-000, Brazil; Sydney E. Everhart, Department of Plant Pathology, University of Nebraska, Lincoln, NE 68583-0722, USA.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2018-03-02
Subjects:	Fungicide effective concentration, Mycelium growth rate, Temperature sensitivity, Malus domestica, Enzyme activity,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088472
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