Fenoxycarb at concentrations of 0.001 mu-g/ml, 0.005 mu-g/ml, 0.01 mu-g/ml, 0.05 mu-g/ml and 0.1 mu-g/ml had an adverse effect on the pupa of Phanerotoma (Phanerotoma) ocularis. When topically applied, it induced morphological abnormalities. The percentage of anomalous obtained depended of developmental pupal stage and was higher when was applied in the first moment of development (80-90%) than in the final of development (50%-60%). These anomalous was inviables. none