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Sensitivity of Botrytis cinerea Isolates from Conventional and Organic Strawberry Fields in Brazil to Azoxystrobin, Iprodione, Pyrimethanil, and Thiophanate-Methyl

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Autor(es):
Baggio, Juliana S. [1, 2] ; Peres, Natalia A. [2] ; Amorim, Lilian [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, ESALQ, Dept Fitopatol, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Florida, Gulf Coast Res & Educ Ctr, Wimauma, FL - USA
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: PLANT DISEASE; v. 102, n. 9, p. 1803-1810, SEP 2018.
Citações Web of Science: 1
Resumo

Botrytis fruit rot, caused by Botryris cinerea, is one of the most important strawberry diseases worldwide, and fungicide applications are often used to manage the disease in commercial production. Isolates of B. cinerea were collected from conventional and organic strawberry fields in four Brazilian States from 2013 to 2015 and their sensitivity to the main single-site mode-of action fungicides used in Brazil was tested, Resistance to azoxystrobin, iprodione, pyrimethanil, and thiophanate-methyl was found and values for effective concentration that inhibited mycelial growth by 50% were higher than 71.9, 1.2, 5.0, and 688 mu g/ml, respectively, regardless the production system. Resistance to these fungicides was observed in 87.5, 76.6, 23.4, and 92.2% of isolates from conventional fields and 31.4, 22.9, 14.3, and 51.4% of isolates from organic fields, respectively. Moreover, frequencies of isolates with multiple fungicide resistance to the four active ingredients were 20.6 and 2.8% whereas 6.3 and 27.8% were sensitive to the four fungicides for conventional and organic areas, respectively. Molecular analyses of the cytochrome b, beta-tubulin, and bay] genes revealed the presence of G143A; E198A; and 1365 N/S, Q369P, or N373S mutations, respectively, in resistant isolates of B. cinerea. Field rates of fungicides sprayed preventively to inoculated strawberry fruit failed to control disease caused by the respective resistant isolates. (AU)

Processo FAPESP: 14/16198-7 - Botrytis cinerea e Colletotrichum spp. em morangueiro: sensibilidade e caracterização molecular de isolados com diferentes níveis de sensibilidade à azoxistrobina, tiofanato metílico e iprodiona
Beneficiário:Juliana Silveira Baggio
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
Processo FAPESP: 13/21930-6 - Botrytis cinerea e Colletotrichum spp. na cultura do morangueiro: sensibilidade de isolados a fungicidas e progresso espaço-temporal
Beneficiário:Juliana Silveira Baggio
Linha de fomento: Bolsas no Brasil - Doutorado