Reduced sensitivity of the mushroom pathogen Verticillium fungicola to prochloraz-manganese in vitro.
Mycol Res
; 109(Pt 6): 741-5, 2005 Jun.
Article
em En
| MEDLINE
| ID: mdl-16080397
ABSTRACT
105 isolates of Verticillium fungicola from Spanish mushroom crops collected between 1992 and 1999 were tested in vitro for their sensitivities to prochloraz-manganese. Dose response relationships for inhibition of mycelial growth by the fungicide were assessed in radial growth experiments on fungicide-amended malt extract agar. The ED50 values recorded for all 105 isolates studied ranged between 0.8 ppm in 1992 and 8.8 in 1998, with an average of 2.9. 86% of the isolates tested were more sensitive to prochloraz-manganese and had ED50 values below 5 ppm, while the other 14% were slightly tolerant with ED50 values equal or above 5 ppm. Of those tested from 1999, 60% (21 isolates) grew with 50 ppm and 40% (14) also at 100 ppm, although mycelial growth was inhibited at least by 82 and 87%, respectively. The resistance factor calculated ranged from low fungicide resistance (RF=3.0) in 1992 to moderate resistance (RF=12.6) in 1998. These data confirm that the sensitivity of V. fungicola to the prochloraz-manganese gradually diminishes.
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Base de dados:
MEDLINE
Assunto principal:
Verticillium
/
Agaricales
/
Agricultura
/
Fungicidas Industriais
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article