Marengo-Santiago, José I.

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    Epidemiología de la Sigatoka negra (Mycosphaerella fijiensis Morelet) en una plantilla de guineo en Puerto Rico
    (2010) Marengo-Santiago, José I.; Chavarría-Carvajal, José A.; College of Agricultural Sciences; Macchiavelli, Raúl E.; Flores-Ortega, Carlos; Department of Crops and Agro-Environmental Sciences; Aponte, Nilda E.
    In order to study the effect of various climatic variables (temperature, relative humidity, rainfall and solar radiation) on the development of black Sigatoka (severity index, youngest diseased leaf and youngest leaf spotted) a field experiment was established at the Agricultural Experimental Substation of Isabela. The results indicate that the black Sigatoka epidemic fits a logistic model with a sigmoidal shift and curvature. Among the environmental variables, temperature was the most important parameter associated with the development of the disease. The severity index and temperatures maximum, average and minimum showed Spearman coefficients of 0.67, 0.66 and 0.68, respectively. The results indicate that solar radiation contributed positively to increase the severity index, indicating that at a high luminic intensity, greater is the severity index. Additionally, rainfall and relative humidity played an important role in the development of the pathogen, obtaining positive correlations with the severity index. The severity index reached values near 100% after flowering. The disease severely affected the crop yield, harvesting bunches with 137.25 fruits, 8 hands and 18.67 Kg for an average of 136.03 g per fruit. Taking into account only the bunch weight, a yield reduction of 61% was observed. However, if we consider the effect of the disease on fruit quality, the reduction on yield reached 100%.