Data/hora: 11/06/2024 09:14:10

Provedor de dados: 	115	
País: 	Mexico	
Título: 	Resistance of Botrytis cinerea from strawberry (Fragaria x ananassa Duch.) to fungicides in Michoacan Mexico	
Autores: 	Álvarez-Medina,Adán; Silva-Rojas,Hilda V.; Leyva-Mir,Santos G.; Marbán-Mendoza,Nahum; Rebollar-Alviter,Ángel.	
Data: 	2017-11-01	
Ano: 	2017	
Palavras-chave: 	Fungicide resistance; Benzimidazole; Dicarboximides.	
Resumo: 	Abstract Gray mold caused by Botrytis cinerea Pers. is one of the most important diseases of strawberry (Fragaria x ananassa Duch.), and fungicide resistance is a concern. The objective of this research was to evaluate the sensitivity of B. cinerea isolates to the fungicides iprodione and thiophanate-methyl in two strawberry-producing areas in Mexico. Sixty-two B. cinerea isolates collected from strawberry fruits from Maravatio Valley (MV) and Zamora-Jacona Valley (ZJ) in Michoacan, Mexico, were used to determine the sensitivity distribution based on mycelium growth (MG) and conidial germination (CG). Each monosporic isolate was grown in 4 plates containing media amended with 0, 0.1, 0.5, 1, 10, 50 and 100 µg mL-1 of iprodione and 0, 0.1, 10, 100, 1000 and 2000 µg mL-1 thiophanate-methyl, and the experiment was conducted twice. The effective concentration (EC50) that inhibits 50 % of mycelial growth and conidial germination was determined for each isolate-fungicide combination by fitting the log-logistic model to the data. Fungicide sensitivity distributions were illustrated by box plots and histograms, and compared by the Kolmogorov-Smirnov non-parametric test. For iprodione, there were significant differences between the sensitivity distributions (p≤0.0001) of both of the sampling areas for mycelia. In MV, the median EC50 was 0.35 µg mL-1, while that of the ZJ isolates was 1.5 µg mL-1. There were no significant differences in the sensitivity distributions of CG (p=0.47) between producing areas for conidia (median EC50 = 3.73 µg mL-1). For thiophanate-methyl, the sensitivity distribution for mycelia was scattered and bimodal, with significant differences between the sampling areas (p≤0.002). The median EC50 of MG was 3.11 µg mL-1 in MV, and 2000 µg mL-1 in ZJ. There were no significant differences between the sensitivity distributions from MV and ZJ in the conidial germination assay (p=0.13, Ks=1.17). The EC50 varied from 0.01 to &gt;2000 µg mL-1 (median=2.01 µg mL-1). Resistance in B. cinerea to thiophanate-methyl and iprodione is widespread in strawberry-producing areas in Michoacan.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952017000700783	
Editor: 	Colegio de Postgraduados	
Formato: 	text/html	
Fonte: 	Agrociencia  v.51 n.7 2017	
Fonte: 	info:eu-repo/semantics/openAccess