Evaluation of genotypes of banana to Colletotrichum musa in postharvest/Avaliacao de genotipos de bananeira a Colletotrichum musae em pos-colheita

• Published in: Revista Brasileira de fruticultura Vol. 32; no. 3; p. 786
• Main Authors: Pinho, Danilo Batista, Mizobutsi, Edson Hiydu, De Oliveira E Silva, sebastiao, Reis, Sidney Tavares Dos, Mizobutsi, gisele Polete, Xavier, Adelica Aparecida, Ferreiraribeiro, regina Cassia, Maia, Victor Ma
• Format: Journal Article
• Language: Spanish
• Published: Sociedade Brasileira de Fruticultura 01.09.2010
• ISSN: 0100-2945

Some tetraploides hybrids present resistance to anthracnose, however the information on the levels of resistance of these genotypes and the behavior in Brazil are reduced. The aim of this study was to evaluate the incidence and severity of injury on the behavior of different banana genotypes resistant to Black Sigatoka for different concentrations of conidia of Colletotrichum musae in different times of evaluation. The fruits of the genotypes, Thap Maeo, Caipira, Pacovan Ken, Ambrosia, PV 42-53, PA 42-44, FHIA 01, FHIA 18 and cultivar Prata Ana, were collected at the stage of physiological maturation. Bunches containing three fruits were atomized with different concentrations: 0, [10.sup.2], [10.sup.3], [10.sup.4], [10.sup.5] and [10.sup.6] of conidia/mL of C. musae. The fruits were incubated at 25[degrees]C. The incidence and severity of the anthracnose were evaluated 3, 6, 9 and 12 days after the inoculation. A completely randomized experimental design was used, in a factorial scheme 9x6x4 (genotypes, concentrations of spores and evaluation periods) with four replications containing four bunches of three fruits. After twelve days of evaluation all the fruits of all the studied genotypes presented incidence of C. musae when different concentrations of inoculum were used. Concerning the severity of the anthracnose, the cultivar Thap Maeo had the lowest severity (27,5%) of anthracnose while the genotypes Ambrosia, PV 42-53, FHIA 18 and FHIA 01 were the most susceptible to the anthracnose at 64%, 64%, 61,33%, and 58% of severity, respectively. Index Terms: Musa, Cultivar, Anthracnose, Postharvest Diseases. Alguns hibridos tetraploides apresentam resistencia a antracnose, porem sao reduzidas as informacoes sobre os niveis de resistencia desses genotipos e o comportamento dos mesmos no Brasil. O objetivo do presente trabalho foi avaliar a incidencia e a severidade de antracnose sobre o comportamento de diferentes genotipos de bananeiras resistentes a Sigatoka-Negra em funcao de diferentes concentracoes de conidios de Colletotrichum musae em diferentes epocas de avaliacao. Os frutos colhidos no estadio de maturacao fisiologica dos genotipos, Thap Maeo, Caipira, Pacovan Ken, Ambrosia, PV 42-53, PA 42-44, FHIA 01, FHIA 18 e a cultivar Prata-Ana utilizada como testemunha. Buques contendo tres frutos foram atomizados com diferentes concentracoes (0; [10.sup.2]; [10.sup.3]; [10.sup.4]; [10.sup.5] e [10.sup.6] conidios/mL) de C. musae. Os frutos foram incubados a 25[degrees]C. A incidencia e severidade da antracnose foi avaliada aos 3; 6; 9 e 12 dias apos a inoculacao. Foi utilizado o delineamento inteiramente casualizado, em esquema fatorial 9x6x4 (genotipos, concentracoes de esporos e epocas de avaliacao), com quatro repeticoes, contendo quatro buques de tres frutos. Aos doze dias de avaliacao, todos os frutos de todos os genotipos estudados apresentaram incidencia de C. musae quando inoculados com as diferentes concentracoes de inoculo. A cultivar Thap Maeo apresentou a menor severidade (27,5%) de antracnose, enquanto os genotipos Ambrosia, PV 42-53, FHIA 18 e FHIA 01 foram as mais suscetiveis a antracnose com 64%, 64%, 61,33% e 58% de severidade, respectivamente. Termos para indexacao: Musa, Cultivares, Antracnose, Doencas, Pos-colheita.