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A sampling plan was designed, starting from the results about the distribution in plant and field of T. palmi potato crop. For this, two sampling proceedings were considered in productive areas of Havana province during three years. They consisted on evaluating larvae density in parcels or in the diagonal of the sector. Mean density was valued by means of variance analysis and means were compared by Duncan (p< 0.05). Relative variation , net relative precision and the most adequate sample size were also calculated. The results showed that, starting from means superior to 3.01 larvae/ folioles, the best procedure is in diagonal, while at lower values, the best estimation was achieved in parcels. In this case the sample required approached at 100 folioles. In a way that population increases 50 and 64 folioles, a reliable sample size can be obtained. [ABSTRACT FROM AUTHOR]