Losses caused by Groundnut ringspot tospovirus in peanut crop in the State of São Paulo

Abstract

An increased incidence and severity of Orthotospovirus species has been observed in the peanut crop. The typical symptoms of the virus, usually known as ringspot in peanut and spotted wilt in other crops, include mosaic, chlorotic ring-shaped spots, necrosis, and plant stunting. This study aimed to verify the occurrence of this virus in peanut growing areas in the São Paulo State, Brazil, identify the predominant virus species, and determine losses resulting from the presence of this virus. Surveys were carried out in four peanut commercial areas sown in the municipalities of Santa Adélia and Cândido Rodrigues in the 2014/2015 season using the cultivar Granoleico. The following parameters were evaluated: plant stand, number of plants with symptoms, and severity of these symptoms through a scoring scale of visual symptoms. The results showed that the predominant virus species is Groundnut ringspot tospovirus (GRSV). Also, the lower the stand is, the higher the percentage of plants with virus symptoms. The mean incidence of GRSV in commercial peanut areas is 40%, with mean losses estimated at 38% when GRSV is present and 64% when there is the presence of virus and reduction in plant density. Michelotto, M. D. et al. notas de sintomas visuais. Pelos resultados obtidos, constatou-se que a espécie de vírus predominante é Groundnut ringspot tospovirus (GRSV). Conclui-se que quanto menor o estande maior a percentagem de plantas com sintomas da virose. A incidência do GRSV nas áreas comerciais de amendoim é em média de 40% sendo as perdas médias estimadas em 38% quando há a presença do GRSV e em 64%, quando há a presença do vírus e a redução na densidade de plantas. Palavras-chave: Arachis hypogaea L. Incidência. Produtividade. Severidade. Tospovirus.

Citrullus lanatus: un nuevo hospedante natural del Groundnut ringspot orthotospovirus en Argentina

“…El manejo de estas enfermedades podría considerarse fácil debido a que se transmiten de manera persistente y un adecuado control químico del vector limitaría su dispersión, pero la alta capacidad para reproducirse en las zonas agrícolas, hace que las aplicaciones no sean altamente efectivas (Michelotto et al, 2019). Además, los trips pueden adquirir orthotospovirus sólo durante los estadios larvarios, mientras que tanto las larvas en estadios más avanzados, como los adultos, son capaces de transmitirlos (Loebenstein y Lecoq, 2012).…”

Potencial produtivo e resistência à virose em linhagens e cultivares de amendoim na região de Tupã, São Paulo

“…Em áreas com incidência da doença, perdas na produção de vagens foram estimadas em 38% e os prejuízos são intensificados quando há redução no estande de plantas, chegando a 64% a redução na produção (MICHELOTTO et al, 2019).…”

Physiological quality of peanut seed affected by tomato spotted wilt disease

“…An average yield loss of 12% annually between 1980s and 1990s with US$40 million cost was reported for Georgia (Bertrand, 1998). In Brazil, epidemic events of TSW have been reported since the 2013–2014 with estimated yield losses varying from 38 to 64% (Michelotto et al., 2019).…”