Abstract

ARRUBLA M., Paula F.; CARDENAS R., Mauricio  and  POSADA F., Francisco J.. EFECTO DE LA HUMEDAD RELATIVA SOBRE LA GERMINACIÓN DE LAS ESPORAS DE Beauveria bassiana Y LA PATOGENICIDAD A LA BROCA DEL CAFÉ Hypothenemus hampeiEFFECT OF ENVIRONMENTAL MOISTURE ON THE GERMINATION OF Beauveria bassiana SPORES AND THEIR PATHOGENICITY AGAINST THE COFFEE BERRY BORER. rev.udcaactual.divulg.cient. [online]. 2010, vol.13, n.1, pp.67-76. ISSN 0123-4226.

The aim of this study was to evaluate the concentration, purity, germination and pathogenicity of Beauveria bassiana spores against the coffee berry borer, after being exposed to humidity levels of 99, 75, 65 and 39%, which were obtained using saturated solutions and kept in humid chambers at a constant temperature of 24°C. Evaluations of the effect of moisture on the spores were carried out after 1, 10 and 20 days of exposure. The results showed that the concentration, purity and pathogenicity of the spores through exposition times at different humidity levels did not present great variation during the time of evaluation. The pathogenicity remained above 86.7% at all humidity levels and evaluation times. The germination was the variable that presented the greatest variation and decreased over time: from 88.9 to 82.1% after one day, from 79 and 68% after ten days and from 62.2 to 56.2% after 20 days. The germination at different moisture levels showed significant differences only within the evaluation times of one and ten days.

Keywords : Fungus; pathogenicity; germination; purity; concentration; Hypothemnmus hampei; coffee.

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