The 2023 NGN project “Management strategies for wheat powdery mildew in southern NSW” focused on validating cost-effective fungicide resistance management strategies for wheat powdery mildew (WPM), a disease capable of causing up to 25% yield loss in Australia. WPM is particularly problematic in western, lower-rainfall areas of NSW during wetter-than-average seasons and under irrigation, especially as many commonly grown wheat varieties are poorly resistant. The dataset includes trial results from two NSW research sites—Balldale and irrigated Hillston—and is organised by site and trial name. Excel spreadsheets contain original data and derived calculations, such as plant density, with keys to explain units and codes. A PDF report outlines the experimental design, treatment summaries, and environmental conditions affecting trial interpretation. Assessments were conducted using GDM ARM software, and each data sheet includes contextual information such as crop growth stage, assessment details, and explanatory notes. This project was supported by GRDC and made possible through the contributions of growers and partners, including FAR Australia and AgGrow Agronomy and Research.