Evaluation of indicators to determine black sigatoka susceptibility in five banana hybrid cultivars ( Mycosphaerella fijiensis Morelet

Abstract

This work had the objective of determining the variation of growth, development and yields indicators of five banana hybrid cultivars. The research was carried in the Agroindustrial Farm Marta Abreu, Cienfuegos, in a carbonated Brown soil. It was made a characterization of the soil and the climatic variables. A field experiment was developed with a design in blocks at random with four repetitions with five banana cultivars as treatments (‘FHIA-18’, ‘FHIA-02’, ‘FHIA-01’, ‘SH-3436 L-9’ and ‘FHIA-23’ . The plots had an area of 56 m2 with 16 plants, been evaluated eight for a total 32 plants for cultivar. The variable evaluated were the spotty youngest leaf, number of leaf by plant, incubation time (PI), evolution time of symptoms (TES) and developing time of symptoms (TED), severity index (IS), active photosynthetic index (INHE) and infection relative index. The cultivars FHIA-23 and SH 3436 L9 presented a hither time of development of the disease. In a general the more susceptible cultivar to the black Sigatoka under of the farm condition was FHIA-23. The clones FHIA-18, FHIA-01 and FHIA-02 presented the best behavior in the spotted youngest leaf and the number of leaf up to the flowering and the harvest time. The clones FHIA-01 and FHIA-18 have the better response to Black Sigatoka attending to the incubation period, the evolution time of the symptom and develo pment time of the disease

Keywords

• banana
• hybrids
• black sigatoka
• Mycosphaerella fijiensis
• FHIA