Abstract

BARRERA V., José; BARRAZA A., Fernando  and  CAMPO A., Rodrigo. SHADOW EFFECT ON BLACK SIGATOKA (Mycosphaerella fijiensis MORELET) IN PLANTAIN CULTIVATION cv HARTON (Musa AAB SIMMONDS). rev.udcaactual.divulg.cient. [online]. 2016, vol.19, n.2, pp.317-323. ISSN 0123-4226.

Black sigatoka in plantain cultivation is considered one of the most limiting production diseases worldwide. It is managed with fungicides, causing environmental pollution and increased production costs. As a nonpolluting strategy, some researchers recommend cultivating shade conditions to reduce the disease. The aim of this study was to evaluate the effect of different shade percentages in the incidence of disease and production under the Caribbean Colombian humid conditions. Under field conditions it was established to cultivate the '˜Harton' in a completely randomized block design and four shade percentages 20, 35 and 50%, having as control plants growing in 100% sun exposure. Evaluations were performed during the flowering period of the crop, quantifying the number of functional leaves NFL, the youngest leaf with symptoms YLS, the youngest diseased leaf YDL, the severity index SI and yield. Treatments with 20, 35 and 50% shade were not statistically different from each other; but with the witness in the NFL, YLS, SI and yield. Treatments with shade had lower SI of black sigatoka, between 13 to 15%; while the witness was 18%; also the yield increased in 400kg ha^-1. It is concluded that growing '˜Harton', managed from 20% shade was enough to reduce the severity of black sigatoka and significantly increase yields.

Keywords : Epidemiology; physiology; management of black sigatoka.

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