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A group of 69 rice cultivars with diverse degrees of resistance to rice blast disease (at least in a qualitative sense) was chosen for a detailed study of some components of race non‐specific resistance, i.e. relative disease efficiency, latent period, and sporulation capacity. Large differences amongst cultivars were found. The overlapping of the normal curves for the qualitative reaction and the components of race non‐specific resistance point out the difficulties of rapid screening for blast resistance by simple observation in the field. One approach to overcome these difficulties could be to use component(s) analysis in the evaluation of rice germplasm to identify parents or progeny having the attributes of race non‐specific resistance.

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The individual effect of resistance inducers acibenzolar-smethyl and potassium phosphate and the mixture with propi-conazole on the severity of black and yellow Sigatokas as well as on growth and production of Dominico Harton plantain (Musa AAB) was evaluated. Also the economic impact of the treatments was determined. The study was carried out at the 'Montelindo' farm (property of the Universidad de Caldas) with an annual rainfall of 2100mm, relative humidity of 76%, average temperature of 23.5°C and altitude of 1010m.Treatments caused a phytosanitary situation, similar to the conventional management; in terms of yield, those treatments with the two doses of acibenzolar-s-methyl (40 y 80mL ha -1 ) and in mixture with the fungicide propiconazole 40 y 200mL ha -1 , showed differences of 6.0, 3.0 and 5.4tha-1 respectively, with respect to the untreated control; treatments with potassium phosphite and the fungicide alone did not show statistical difference with the control.