Eduardo Stuchi - Academia.edu (original) (raw)

Papers by Eduardo Stuchi

Pesquisa Agropecuaria Brasileira, Jun 1, 2006

Mandarins occupy the third group among citrus produced in Brazil. Primarily aimed at the fresh fr... more Mandarins occupy the third group among citrus produced in Brazil. Primarily aimed at the fresh fruit market, commercial orchards have suffered significant losses in production, due to the high incidence of diseases, such as alternaria brown spot (ABS) and huanglongbing (HLB). The fact that 80% of the orchards are composed of two varieties, Ponkan mandarin and Murcott tangor, are highly susceptible to both diseases, demand intensive chemical control of the diseases in the field, which has resulted in a significant increase in production costs and a negative environmental impact. A total of one hundred and seventy-three mandarin accessions, including several species and hybrids, belonging to the Collections of the Instituto Agronômico de Campinas (IAC), were evaluated in the field, in an endemic location for the diseases. Evaluations of the incidence and severity of the diseases showed that there is a range of genotypes tolerant to ABS with potential to replace the current commercial ...

Outlooks on Pest Management

Recorded in Brazil since 2004, Huanglongbing (HLB), or simply Greening, is the most impacting dis... more Recorded in Brazil since 2004, Huanglongbing (HLB), or simply Greening, is the most impacting disease in citrus production worldwide. It induces qualitative and quantitative losses in production, but also can be lethal to the infected citrus plant. The disease is caused by phloem-limited bacteria with three identified species, Candidatus Liberibacter asiaticus (CLas), Ca. L. africanus (CLaf), and Ca. L. americanus (CLam). CLas and CLam are reported in Brazil, being vectored by the Asian citrus psyllid Diaphorina citri. HLB-infected citrus exhibit blotchy mottling with green islands on leaves, and small and lopsided fruits. As the infection progresses, excessive fruit drop and dead branches are frequently observed, shortening the trees' lifespan and reducing fruit yield and quality. HLB occurrence is restricted to the States of São Paulo, Minas Gerais, Mato Grosso do Sul and Paraná, which corresponds to more than 85% of citrus production in Brazil. Although citrus production is c...

Journal of Citrus Pathology

Experimental Agriculture

Pera sweet orange (Citrus sinensisL. Osbeck) is the most important mid-season sweet orange cultiv... more Pera sweet orange (Citrus sinensisL. Osbeck) is the most important mid-season sweet orange cultivar in Brazil, not only because of its desirable fruit quality for both juice processing and the fresh fruit market, but also because there is a lack of adequate mid-season alternative sweet orange cultivars. This study aimed to evaluate the horticultural performance of other sweet oranges in an attempt to identify similar or superior selections to the standard cultivar, Pera IAC sweet orange. Seventeen sweet oranges selections, including the standard Pera IAC, were budded on Sunki mandarin [C. sunki(Hayata) hort. ex Tanaka]. The experiment was planted in 2007, using 12-month-old nursery trees, with 6.5 × 2.5 m spacing in the Southern region of São Paulo state, Brazil. The experimental orchard was maintained with standard commercial management practices, and without supplementary irrigation. Data collection started three years after planting and was carried out until seven years after the...

Cruz das Almas, BA: Embrapa Mandioca e Fruticultura, 2021., 2021

Agriculture, 2022

Citrus relatives are a relevant source of valuable traits for use in citrus breeding, including r... more Citrus relatives are a relevant source of valuable traits for use in citrus breeding, including resistance to diseases such as Huanglongbing (HLB). Resistant rootstocks may impact tree responses to HLB. This requires graft compatibility, which has been poorly investigated within the Aurantioideae. In this study, the biometric characteristics and the anatomy of the graft union of 86 scion/rootstock combinations were assessed. This comprised 18 genotypes/species and 8 genera from Citrinae, Balsamocitrinae, and Clauseninae subtribes sensu Swingle and Reece. Most graft combinations were found to be noncompatible. Phylogenetic proximity did not ensure successful grafting as, for example, Orange jasmine autografts failed, whereas some intergeneric grafts were successful (>60% of graft-take). Plant scion height was directly related to graft-take, but the correlation between the scion and rootstock stem diameters was not a reliable indicator of graft compatibility. Rangpur/Tabog, Tabog/R...

The commercial cultivation of the ‘Galego’ Mexican lime has important limitations related to high... more The commercial cultivation of the ‘Galego’ Mexican lime has important limitations related to high susceptibility to citrus canker and especially to tristeza (Citrus tristeza virus CTV). Its main rootstock is the Rangpur lime, with which it forms a scion/rootstock combination highly susceptible to CTV and gummosis-of-Phytophthora. The fruits of ‘Galego’ have smaller size and presence of seeds, traits that disfavor it for fresh fruit market when compared to the ‘Tahiti’ Persian lime. The selection of new varieties of ‘Galego’ and their rootstocks is desirable to promote the use of this acid lime, expanding the available options for the consumer market. The Galegão variety, also known as Malay lemon, was studied and showed good results in Jaboticabal-SP. Two experiments were carried out in Bebedouro, São Paulo, aiming its horticultural performance evaluation in combination with different rootstocks. The cultivar has good horticultural performance, and can be recommended for São Paulo c...

Tropical Plant Pathology, 2020

Acta Horticulturae, 2012

This study aimed to evaluate the postharvest conservation of tangerines 'Fremont', 'S... more This study aimed to evaluate the postharvest conservation of tangerines 'Fremont', 'Satsuma Okitsu' and 'Ponkan' when stored at different conditions, as well as the quality of the minimally processed product. Fruit were harvested when a sugar:acid ratio of 10.0 to 12.0 for 'S. Okitsu' and 'Fremont' and 16.0 to 19.0 for 'Ponkan' was reached, selected for uniformity of color, size, and absence of injuries. Whole fruits were stored at 3°C, 85% RH and 7°C, 95% RH, and after each storage period, fruits were brought to ambient conditions (22°C, 65% RH) for 3 days before evaluation. The minimally processed products (peeled) were packed in polystyrene trays (22.4×14.8×3.7 cm) coated with polyvinyl chloride (PVC) stretchable, with 0.014 mm thickness, and in lidded packages (500 ml) of transparent polyethylene terephthalate. Fruit were analyzed for appearance, weight loss, respiratory rate, package atmosphere, rind and pulp color, soluble solids, titratable acidity and ascorbic acid content. Shelf life of tangerine 'Fremont' was limited to 42 days based on freshness. Its minimally processed product had a 9 day shelf-life for products packaged in PVC film. The mandarins 'S. Okitsu' had 35 days shelf-life at 7°C, which was reduced to 28 days at 3°C. Its fresh-cut product had a shelf-life of 15 days, stored in PVC or PET. 'Ponkan' fruit stored at 3°C had a shelf life of 35 days, which was reduced to 28 days at 7°C. When minimally processed, its shelf-life lasted for 15 days, whether packaged in PVC or PET. The ‘Ponkan’ had a shelf-life of 35 days at 3°C and 28 days at 7°C, also limited by loss of freshness. When minimally processed and stored in PVC or PET, its shelf life reached 15 days.