Predatory Mite Phytoseiulus pessimists Release Rates on the Population Dynamics of Tetranychid urticate in Gerbera amsonia

Abstract

Spider mites pose a significant threat to ornamental crop production, often leading to reduced plant quality and economic losses. This study evaluates the effectiveness of different release rates of the predatory mite Phytoseiulus persimilis in regulating populations of Tetranychus urticae in Gerbera jamesonii under controlled cultivation conditions. A series of experiments were conducted using varying predator-to-prey ratios to assess their impact on pest population dynamics, plant health, and overall crop performance. The results demonstrated that increased release rates of Phytoseiulus persimilis significantly suppressed Tetranychus urticae populations, with higher predator densities leading to faster and more sustained control. Optimal release rates effectively maintained pest populations below economic threshold levels, resulting in improved plant vigor, leaf quality, and flower yield. Lower release rates, while providing some level of control, were less effective in preventing rapid pest resurgence. The study also highlighted the importance of timely predator introduction for maximizing biocontrol efficiency. While analytical approaches were used to monitor population trends and treatment effectiveness, the primary focus remained on biological pest management and crop protection strategies. The findings underscore the potential of Phytoseiulus persimilis as an effective and environmentally sustainable alternative to chemical pesticides in ornamental crop systems. This research contributes to integrated pest management by providing practical guidelines for optimizing predator release strategies to enhance crop protection, reduce chemical inputs, and support ecological balance in greenhouse and field conditions.