Citrus tristeza disease severity and agronomic performance of ‘Pêra’ sweet orange cultivars and selections in the North and Northwest regions of the State of Paraná, Brazil

Abstract

‘Pêra’ sweet orange is the most important citrus cultivar in Brazil, but it is highly susceptible to Citrus tristeza virus (CTV), the causal agent of citrus tristeza disease. In this study, we evaluated the severity of citrus tristeza disease and its relation with the agronomic performance of seven cultivars and six selections of ‘Pêra’ sweet orange under field conditions in the North and Northwest regions of the State of Paraná, Brazil. The citrus tristeza disease severity was determined based on symptoms of stem pitting. The vegetative growth assessed in trees of all four locations for the 2012 season, and in two field plots for the 2011, 2012 and 2013 harvests, respectively. The cultivar ‘IPR 153’ (Bianchi) had the best performance concerning stem pitting severity, while Selection 27 was among the ones with the highest rate of vegetative growth. Further, Selections 27 and 12, and the cultivar ‘Vimusa’ had the largest fruit yields. Based on correlation analysis, stem pitting symptoms severity was negatively correlated with vegetative growth and fruit yield. Furthermore, environmental conditions may have played an important role in the severity of citrus tristeza disease and consequently on the agronomic performance of the cultivars and selections of ‘Pêra’ sweet orange in the North and Northwest regions of the State of Paraná.

Early rootstock selection under ‘tahiti’ acid lime crown in Capitão Poço, Pará State, Brazil

“…The productive efficiency presented in Table 4 of the best rootstocks was higher compared to sweet orange on different rootstocks (Azevedo, Rosseto, Schinor, Martelli, & Pacheco, 2012;Brugnara & Andrade, 2019;Giampani, Tazima, Baba, Yada, & Leite Júnior, 2016;Rodrigues et al, 2019) and also compared to Tahiti acid lime on various rootstocks by Rodrigues et al (2018). This was similar to the performance presented by Costa et al (2021), who worked on orange trees with different rootstocks.…”

Desempenho de dois pomares adultos de laranjeira ‘Pêra’ no oeste de Santa Catarina, Brasil

“…Não foram encontrados na literatura dados de massa média de frutos da 'Pêra' produzidos nas regiões de clima subtropical do sul do Brasil. Porém, em Cocal do Sul/SC, a laranjeira 'Hamlin' produziu, do segundo ao sétimo ano, frutos com massa média de 124,8g (KOLLER et al, 2000), valor inferior ao observado para os pomares 1 e 2, tanto para massa média global quanto para as categorias G e M. A média dos casos em estudo é também superior à de todos os clones de 'Pêra' testados em Cordeirópolis/SP por Schinor et al (2009), mas semelhante ao observado em Londrina/ PR por Giampani et al (2016) em vários clones de 'Pêra'. Dessa forma, não se pode afirmar que a massa média dos frutos em Chapecó e Xaxim é pequena, mas sim semelhante à das regiões tropicais.…”

Severity and genetic diversity of Citrus tristeza virus complexes infecting ‘Pêra Bianchi’ sweet orange in Paraná, Brazil

“…In our studies, stem pitting symptoms were more severe in trees exposed to colder conditions. These conditions may favor viral replication and symptoms expression (Dodds et al 1987;Koller and Soprano 1998;Carvalho et al 1997;Salibe et al 2002;Giampani et al 2016).…”

“…A population of genetically related variants of the virus is likely to be involved in CTV infections (Ayllón et al 1999;Kong et al 2000;Rubio et al 2001). Furthermore, the development of citrus tristeza symptoms depends on the rootstockscion combination, aggressiveness of the CTV complex, and environmental conditions, particularly temperature (Bennett and Costa 1949;Carvalho et al 1997;Salibe et al 2002;Giampani et al 2016).…”

“…The most common symptoms of citrus tristeza in 'Pêra' sweet orange grafted on rootstocks tolerant to CTV are stem pitting in the trunk and branches, small and chlorotic leaves, undersized and deformed fruits, and general stunting of the citrus trees (Bennett and Costa 1949;Souza and Müller 2006;Moreno et al 2008;Dawson et al 2013Dawson et al , 2015. Furthermore, the severity of stem pitting in trees of 'Pêra' sweet orange has also been associated with poor agronomic performance regarding vegetative vigor and yield (Baba et al 2014;Giampani et al 2016).…”