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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Baseline sensitivity of Colletotrichum acutatum isolates from Brazilian strawberry fields to azoxystrobin, difenoconazole, and thiophanate-methyl

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Baggio, Juliana S. [1, 2] ; Wang, Nan-Yi [2] ; Peres, Natalia A. [2] ; Amorim, Lilian [1]
Total Authors: 4
[1] Univ Sao Paulo, Dept Fitopatol, ESALQ, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Florida, Gulf Coast Res & Educ Ctr, 14625 CR 672, Wimauma, FL 33598 - USA
Total Affiliations: 2
Document type: Journal article
Source: TROPICAL PLANT PATHOLOGY; v. 43, n. 6, p. 533-542, DEC 2018.
Web of Science Citations: 0

Anthracnose fruit rot, caused by Colletotrichum acutatum, is an important disease affecting strawberry fields in Brazil where fungicide applications are frequently needed for disease control. Isolates of C. acutatum were collected in conventional and organic strawberry fields in the states of SAo Paulo and Espirito Santo, Brazil, from 2013 to 2015. Sensitivity to azoxystrobin, difenoconazole and thiophanate-methyl was evaluated based on mycelial growth, spore germination, detached fruit assays and molecular characterization of genes targeted by these fungicides. The effective concentration needed to reduce mycelial growth by 50% (EC50) was determined for 78 isolates. Mean EC50 values for isolates collected in organic fields were 0.44 and 0.10g/ml, and in conventional areas were 0.62 and 0.09g/ml for azoxystrobin and difenoconazole, respectively. Mean EC50 values, determined using spore germination test, for 43 isolates were 0.04 and 0.13g/ml for isolates from organic and conventional fields, respectively, for azoxystrobin. Azoxystrobin- and difenoconazole-resistant isolates were not observed. Populations of C. acutatum showed insensitivity rather than resistance to thiophanate-methyl and EC50 values could not be determined. Molecular analyses of the cytb, cyp51 and -tub genes did not reveal any of the most common point mutations associated with fungicide resistance. (AU)

FAPESP's process: 14/16198-7 - Botrytis cinerea and Colletotrichum spp. in strawberries: sensitivity and molecular characterization of isolates with different levels of sensitivity to azoxystrobin, thiophanate-methyl and iprodione
Grantee:Juliana Silveira Baggio
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/21930-6 - Botrytis cinerea and Colletotrichum spp. in strawberries: fungicide sensitivity of isolates and spatio-temporal progress
Grantee:Juliana Silveira Baggio
Support type: Scholarships in Brazil - Doctorate