Colofonia de pináceas cubanas para el control de enfermedades tropicales transmitidas por moluscos

schistosomiasis is the second most common parasitic disease (after malaria) contracted by humans worldwide. it does not exist in cuba, although the risk of it developing here is ever-present since there are species in our fauna that can act as intermediate hosts for the trematode responsible for the tropical illness. the objective of this study was to evaluate rosin powder on biomphalaria havanensis larvae for the control of the vectors that spread schistosomiasis, according to the methodology developed by the world health organization (who) and described by mott for the evaluation of plants with molluscicidal action. the study results suggest that the molluscicidal action of rosin from cuban species of pines (pinus caribaea y pinus tropicalis) on biomphalaria havanensis larvae in lethal doses (dl50 and dl90) are 44, 33 m·gl-1 and 141, 76 m·gl-1, respectively. the regression equation was: y = -0, 412 + 1, 086 ln x with a value of the correlation coefficient r 0, 99 and standard error 0, 13. the doses reveal the effectiveness of the components present in rosin; similar results have been reported for other plant extracts.