Organización para Estudios Tropicales, (OET), Costa Rica
Bibliografía Nacional en Biología Tropical, (BINABITROP)

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Signatura:Biblioteca OET: NBINA-13674.
Autor: Vargas-Calvo, Alfonso; Guzmán-Quesada, Mauricio; Araya-Vargas, Mario; Murillo, Gilbert; Blanco-Rojas, Fabio A.
Dirección: CORBANA S.A., Dirección de Investigaciones, Apdo. 390-7210, Guápiles, CR E-mail: alfvarga@corbana.co.cr E-mail: mguzman@corbana.co.cr E-mail: marioa@amvac-chemicalcr.com.
Título: Efecto de la defoliación a la floración sobre el rendimiento del banano (Musa AAA) y la severidad de la Sigatoka negra en condiciones semicomerciales. Effect of defoliation at flowering on banana (Musa AAA) yield and black Sigatoka severity in semi-commercial conditions.
P.imprenta: v. 34, no. 61, p. 39-54. Año 2008.
Serie: CORBANA (Costa Rica).
Descriptores: PLANTS; SPERMATOPHYTES; MAGNOLIOPHYTA; LILIOPSIDA; ZINBERALES; FUNGI; DOTHIDEALES; ASCOMYCOTA; EUMYCOTA; ZINGIBERALES.
MUSACEAE; MUSA (BANANAS); MYCOSPHAERELLA FIJIENSIS VAR. DIFFORMIS; BLACK SIGATOKA; PLANT PATHOGENIC FUNGI; PLANT DISEASES; PLANT PATHOGENS; DISEASE CONTROL; DELEAFING; DEFOLIATION; YIELD; BUNCH WEIGHT; CULTURAL CONTROL; INOCULUM MANAGEMENT; SANITARY DELEAFING.
COSTA RICA; CENTRAL AMERICA.
SARAPIQUI (CANTON); AREA DE CONSERVACION CORDILLERA VOLCANICA CENTRAL; SIQUIRRES (CANTON); AREA DE CONSERVACION LA AMISTAD CARIBE; MATINA (CANTON); AREA DE CONSERVACION TORTUGUERO.
Resumen: Black Sigatoka is the main phytopathological problem in commercial banana plantations. Its management is done through cultural practices tending to reduce the conditions that favored the disease and by the application of fungicides to protect leaf tissue from pathogen infection. In experiments done where certain banana leaves were pruned at flower emergence it was found that the practice did not affect the banana yield and in some cases reduced the disease severity. The present work, evaluated the effect of leaf pruning at flowering on yield and black Sigatoka infection in three semi-commercial conditions. Two adjacent plots were established in commercial banana plantations located in Sarapiquí, Siquirres and Matina counties. In one plot, plants at flowering were pruned leaving their with 9 leaves, and in the other plot, plants remained unpruned (control). Leaf pruning did not reduce bunch weight nor fruit diameter at Sarapiquí (P = 0.5156; P = 0.4069) and Siquirres (P = 0.9962; P = 0.6426), respectively. In Matina county, a higher bunch weight of 2.3 kg (P less than 0.0001) and an increase in the number of hands of 0.5 (P less than 0.0001) were observed in pruned compared to unpruned plants. Even though, the youngest leaf streaked, youngest leaf spotted and black Sigatoka severity at flowering and at 11 weeks after flower emergence did not differ between pruned and unpruned plants the trend of those variables indicated a minor disease pressure in plants from pruned plots. The congruency between yield and black Sigatoka results from previous experiments with these found here in semi-commercial conditions suggest the inclusion of the practice within the integrated disease management in commercial conditions. The implementation of leaf pruning at flower emergence would increase labor efficiency responsible of leaf sanitation, since surgery and de-leafing is reduced
Compiled by: Organization for Tropical Studies


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