Evaluation of pyraclostrobin as a management tool of Groundnut ringspot virus in peanut crop
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Evaluation of pyraclostrobin as a management tool of Groundnut ringspot virus in peanut crop Marcos Doniseti Michelotto & Rita de Cássia Pereira-Carvalho & Luciane de Nazaré Almeida dos Reis & Leonardo Silva Boiteux & Willians César Carrega & Luis Eduardo Prado Lamana & Ignácio José de Godoy
Received: 30 May 2019 / Accepted: 29 July 2020 # Springer Nature B.V. 2020
Abstract Yield losses due to Groundnut ringspot virus – GRSV (genus Orthotospovirus) infection have been observed across major peanut (Arachis hypogaea L.) growing areas in Brazil. However, effective management systems capable of minimizing GRSV damage are not yet available. The aim of the present study was to verify the effectiveness of the pyraclostrobin (a strobilurin fungicide reported as a potential activator of natural, large–spectrum plant defense mechanisms) in the management of GRSV in peanuts. Two independent field experiments were carried out in commercial peanut areas with a natural occurrence of GRSV. A completely randomized block design was used with a 5 × 2 factorial scheme, including four replicates, five peanut cultivars (‘Runner IAC 886’, ‘IAC OL4’, ‘IAC 503’, ‘IAC 505’, and ‘Granoleico’) and two treatments (with and without pyraclostrobin application). At 80 and 100 days after
M. D. Michelotto Apta, Polo Regional Centro Norte, Rodovia Washington Luis, Km 372, C. Postal 24, CEP 15830-000, Pindorama, SP 15830-000, Brazil e-mail: [email protected] R. de Cássia Pereira-Carvalho (*) : L. de Nazaré Almeida dos Reis Universidade de Brasília, UnB, Brasília, DF, Brazil e-mail: [email protected]
sowing, visual disease severity scores and the number of infected plants were evaluated, followed by virus quantification in the leaf tissues and yield. The cultivars ‘Granoleico’ and ‘IAC 503’ displayed the highest levels of GRSV susceptibility. Pyraclostrobin was found to be effective in reducing the number of GRSV–infected plants, as well as in attenuating disease severity. In addition, pyraclostrobin was able to promote significant yield increase. Even though the mechanism(s) of pyraclostrobin action against GRSV remain elusive, this fungicide can be regarded as a potential component for viral disease management programs in peanuts.
Keywords Arachis hypogaea . Damages . Fungicide . Losses . Orthotospovirus
L. S. Boiteux Embrapa Hortaliças, Brasília, DF, Brazil e-mail: [email protected] W. C. Carrega Departamento de Produção Vegetal, FCAV/Unesp, Jaboticabal, SP, Brazil e-mail: [email protected]
e-mail: [email protected]
L. E. P. Lamana Instituto Taquaritinguense de Ensino Superior–ITES, Taquaritinga, SP, Brazil e-mail: [email protected]
L. de Nazaré Almeida dos Reis e-mail: [email protected]
I. J. de Godoy Centro de Grãos e Fibras, IAC, Campinas, SP, Brazil e-mail: [email protected]
Phytoparasitica
Introduction Severe peanut (Arachis hypogaea L., Fabaceae) crop losses due to tospovirus infection (Orthotospovirus genus, Tospoviridae family) have been reported since de 1940s in Brazil (COST
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