Avaliação de genótipos de bananeira à Colletotrichum musae em pós-colheita

Abstract

, VICTOR MARTINS MAIA 9 RESUMO -Alguns hibridos tetraploides apresentam resistência à antracnose, porém são reduzidas as informações sobre os níveis de resistência desses genótipos e o comportamento dos mesmos no Brasil. O objetivo do presente trabalho foi avaliar a incidência e a severidade de antracnose sobre o comportamento de diferentes genótipos de bananeiras resistentes a Sigatoka-Negra em função de diferentes concentrações de conídios de Colletotrichum musae em diferentes épocas de avaliação. Os frutos colhidos no estádio de maturação fisiológica dos genótipos, Thap Maeo, Caipira, Pacovan Ken, Ambrosia, PV 42-53, PA 42-44, FHIA 01, FHIA 18 e a cultivar Prata-Anã utilizada como testemunha. Buquês contendo três frutos foram atomizados com diferentes concentrações (0; 10 2 ; 10 3 ; 10 4 ; 10 5 e 10 6 conídios/mL) de C. musae. Os frutos foram incubados a 25 ºC. A incidência e severidade da antracnose foi avaliada aos 3; 6; 9 e 12 dias após a inoculação. Foi utilizado o delineamento inteiramente casualizado, em esquema fatorial 9x6x4 (genótipos, concentrações de esporos e épocas de avaliação), com quatro repetições, contendo quatro buquês de três frutos. Aos doze dias de avaliação, todos os frutos de todos os genótipos estudados apresentaram incidência de C. musae quando inoculados com as diferentes concentrações de inóculo. A cultivar Thap Maeo apresentou a menor severidade (27,5%) de antracnose, enquanto os genótipos Ambrosia, PV 42-53, FHIA 18 e FHIA 01 foram as mais suscetíveis à antracnose com 64%, 64%, 61,33% e 58% de severidade, respectivamente. Termos para indexação: Musa, Cultivares, Antracnose, Doenças, Pós-colheita. EVALUATION OF GENOTYPES OF BANANA TOColletotrichum musa IN POSTHARVEST ABSTRACT -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 Anã, were collected at the stage of physiological maturation. Bunches containing three fruits were atomized with different concentrations: 0, 10 2 , 10 3 , 10 4 , 10 5 and 10 6 of conidia/mL of C. musae. The fruits were incubated at 25 ºC. 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...

Agronomic characterization and resistance of banana genotypes to Colletotrichum musae

“…On the other hand, the genotypes Caipira, Thap maeo and Fhia 18 presented greater resistance to the fungus, and consequently, a superior shelf life. Studies performed by Pinho et al (2010) demonstrated that the genotype Thap Maeo showed less severity (27.5%) to anthracnose, while the genotypes Fhia 18 was the most susceptible, with 61.33% severity levels. Studies by several authors have shown the importance of the exploitation of these genotypes mainly because they are resistant to Mycosphaerella fijiensis (PINHO et al, 2010).…”

Survival analysis: a tool in the study of post-harvest diseases in peaches

“…The authors reported only the incidence on day seven, without comparing orchards, harvests or consider a possible tree effect. Similarly, Pinho et al (2010) evaluated the incidence of Colletotrichum musae in nine banana genotypes inoculated with six inoculum concentrations in two evaluation dates, in a factorial design allowed by variance.…”