Fernando Alves de Azevedo

Avaliação da mancha preta dos citros em diferentes variedades de laranjeira doce

The citrus black spot - CBS (Guignardia citricarpa Kiely) has been responsible for great losses in Brazil, where all commercial varieties of sweet orange are susceptible. Given the economic losses that this disease causes to the brazilian citrus industry, this study aimed to evaluate the susceptibility of sweet orange varieties with late harvest to CBS. A total of 36 varieties were evaluated in Cordeiropolis city, and 35 located at Conchal city, in two years (2007 and 2008), both in Sao Paulo State, Brazil, in randomized block design assays with three replications. By using a diagrammatic scale specific to the CBS, the severity of CBS was quantified between the months from June to November (2007 and 2008), data was used to calculate the area under disease progress curve. All varieties were susceptible to CBS, however Imperial and Valencia Palida Israel were less susceptible than the others at both locations.

Sensory acceptance and postharvest quality of a new hybrid of citrus: TMxLP 16

Planting new types of sweet orange is an interesting alternative for the Brazilian citrus growers as this domestic market continues to grow. Thus, the aim of this study was to evaluate the acceptance and storage of a new hybrid between Murcott tangor and Pêra sweet orange, TMxLP 16. The treatments tested were: storage of fruits with and without wax, at room temperature (21 ± 2 °C and relative humidity (RH) = 60 ± 5%) and at cold temperature (10 ± 2 °C and RH = 90 ± 5%). Before storage samples were sensory tested for acceptance. Physicochemical qualities of the fruit and juice [mass, seeds, juice yield, acidity, soluble solids and ratio of soluble solids to titratable acidity (SS/TA)] were performed, before and after storage. The TMxLP 16 hybrid has an appropriate mass required for sale per fruit, a suitable juice yield, and early-mid season maturation, with high sensory acceptance, all characteristics which meet the standards required by the Brazilian consumer market. The results of this investigation showed that fruit stored at room temperature lost considerable weight. These results indicate a trend towards a loss of quality in fruits stored under ambient conditions and not coated with wax, which reaffirms the need for the use of refrigeration and waxy coverage for postharvest conservation of citrus fruits in natura.

Qualidade pós-colheita de um híbrido do tipo Ponkan de maturação tardia

O estudo de tangerinas e hibridos e de grande importância, tendo em vista o pequeno numero de variedades plantadas comercialmente e o amplo mercado que esse tipo de fruta pode atingir. O presente trabalho teve como objetivo avaliar a aceitacao sensorial do hibrido TMxTP 9, proveniente do cruzamento entre tangor Murcott (TM) com tangerina Ponkan (TP), possibilitando a ampliacao do quadro varietal desse grupo citrico. Foram avaliadas as caracteristicas fisicoquimicas (massa, tamanho, numero de sementes, cor, acidez, vitamina C, solidos soluveis, ratio e rendimento de suco) e sensoriais (cor, sabor, aroma, textura, tamanho, descasque, firmeza). Um total de 50 provadores, nao treinados, realizou o teste de aceitacao sensorial atraves da escala hedonica estruturada de nove pontos para a aceitabilidade e escala estruturada de cinco pontos para intencao de compra. Os resultados obtidos na avaliacao sensorial apresentaram indices de aceitabilidade superiores a 50, ou seja, os frutos do hibrido TMxTP 9 tiveram 78% de aceitacao, o que indica que a variedade em questao agradou ao paladar dos consumidores brasileiros, sendo sua intencao de compra ainda mais satisfatoria, 84% dos provadores comprariam o produto. Conclui-se, portanto, que os frutos analisados estao aptos para a comercializacao, visto que apresentaram um bom resultado sensorial, com alta intencao de compra e aceitacao.