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Smart nutrient management is gaining traction as a cornerstone of integrated pest and disease control, especially in tropical fruit crops like papaya and banana—key commodities in northern Australia. This review explores how nutrient imbalances, particularly excessive nitrogen, can worsen pest outbreaks such as mite infestations. Drawing on Mulder’s chart of nutrient interactions, we highlight how surplus nitrates can inhibit potassium uptake, weakening plant defences. We also examine emerging smart pest control strategies, including real-time nutrient diagnostics and intelligent monitoring systems, that offer practical tools for Australian growers. By blending scientific research with field-based insights, this paper aims to support sustainable farming practices and inform decision-making in Australia’s tropical horticulture sector. We also consider the role of AI technologies like deep learning and large language models in shaping the future of pest management.