The predatory mite Phytoseiulus persimilishas been used successfully to control the phytophagous mite Tetranychus urticaein rose crops, in what is one of the most important pests. In Colombia, this control strategy has been limited by the lack of predators in the trade of the product. Here, it is proposed to standardize the basis for the production of P. persimilison bean plants infested with populations of T. urticaeof different development times, using a constant proportion of predators released. We found that populations of plants infested with T. urticaefor more than three weeks resulted in higher population increase of predators and at approximately 25 days after the release of