To stablish a permanent sampling program for Focidentalis (Pergande) populations, we sampled during six weeks, different reproductive structures of blackberry at a commercial crop in a plastic house. Lloyd's mean crowding, Taylor's power law, fwao's and Kuno's equations were determmined to stablish spatial distribution patterns for inmatures and adults and for each reproductive structure of blackberry. Adults on inflorescences, and adults and inmatures on floral buttons, showed to be aggregated while inmatures on flowers, and adults and inmatures on fruits followes a ramdom distribution. Kuno's method showed a better adjustment and was selected as the model to develop a secuencia ampling for eaach plant structure and insec stage, emphasizing the adult stage on inflorescences, because this was the simplest method to sample population.