Mitigating Aflatoxin Contamination in Pistachios: An Integrated Approach From Cultivation to Commercialization

Aflatoxin contamination of pistachios represents a significant global food safety challenge, posing substantial risks to public health and imposing considerable economic constraints on international trade. A periodic review of RASFF data indicates a persistent problem of aflatoxin contamination in nuts, particularly pistachios, within international trade, highlighting the need for sustainable and preventive control strategies. The primary etiological agents are toxigenic species of Aspergillus , principally A. flavus , which can colonize the nut during preharvest, harvest, and postharvest stages. A critical juncture for infection is the initial colonization in the orchard, frequently facilitated by early nut splitting, insect damage, and various abiotic stressors. The prevalence and severity of fungal colonization and subsequent aflatoxin biosynthesis are profoundly influenced by a complex interplay of environmental factors. Consequently, a multifaceted approach to mitigation is essential. Foundational strategies involve the implementation of sound horticultural and Good Agricultural Practices (GAPs), including optimizing orchard design, cultivar selection, irrigation, and nutrition, alongside timely harvesting and meticulous postharvest management. Among advanced control measures, biological control has emerged as a promising strategy. The application of competitive, nontoxigenic A. flavus strains, such as the commercially deployed AF36, has demonstrated efficacy in reducing aflatoxin contamination by up to 45%. This intervention, sanctioned by regulatory bodies and widely adopted in major production regions like California, serves as a paradigm for scalable and sustainable mycotoxin management in global pistachio production systems.