Phorid Parasitoids of Leaf‐Cutting Ants: Ecological Insights and Biocontrol Perspectives

ABSTRACT Phorid parasitoids of leaf‐cutting ants provide a unique model for examining the line that separates evolutionary ecology and applied biological control. Unlike classical biological control programs targeting invasive pests outside their native range, management of ants in the genus Atta and Acromyrmex occurs within their natural ecosystems, where they function both as ecosystem engineers and as major agricultural pests. Phorids are usually host specific and show clear evolutionary segregation between Atta ‐ and Acromyrmex ‐associated guilds, as well as multidimensional resource partitioning across worker sizes, tasks, and microhabitats. Although natural parasitism rates are often low and spatially heterogeneous, phorids generate strong trait‐mediated indirect effects that reduce foraging activity, alter worker allocation, and impose chronic stress on colonies. Under certain ecological contexts, colony‐level parasitism can reach unusually high levels, suggesting that the impact of phorids on host colonies may increase when parasitoid abundance is greater. However, phorids primarily attack exposed foragers and rarely achieve mortality rates sufficient to suppress mature colonies as standalone control agents. Their applied value therefore lies not in rapid colony elimination but in reducing functional performance and increasing susceptibility to complementary control tactics. Environmental context strongly modulates parasitoid effectiveness, with habitat complexity and host availability emerging as key determinants of parasitism intensity. Here we synthesize almost 100 years of knowledge on the taxonomy, ecology, host specificity, behavioral impacts, and environmental drivers of phorid–leaf‐cutting ant interactions, and we evaluate their realistic potential within integrated pest management (IPM) programs. We conclude that phorid parasitoids are best positioned as complementary agents within diversified IPM strategies rather than as standalone solutions. Advances in mass‐rearing, multispecies release strategies, and integration with other biological control tools will be essential to fully realize their potential in sustainable management of leaf‐cutting ants in Neotropical agroecosystems.