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Heat Mitigation: Sunburn and Fruit Coloring

In this research-driven webinar, Dr. Lee Kalcsits and Dr. Lailiang Cheng break down the science — and the strategy — behind two critical fruit quality challenges: sunburn and red color development. ☀️ Sunburn 101 (Dr. Kalcsits) What really causes apple sunburn? Learn the differences between sunburn necrosis, browning, and photo-oxidative damage — and why fruit surface temperature can run 20°F hotter than the air. Lee reviews cultivar susceptibility (yes, Honeycrisp), canopy architecture, and the real-world pros and cons of reflective sprays, evaporative cooling, and shade netting. 🍎 Red Color Development (Dr. Cheng) What controls anthocyanin production? Cheng explains the genetics behind red color, why strains matter, and how crop load, nitrogen, light exposure, and temperature influence color — especially in Honeycrisp. Practical strategies include precision crop load management, targeted leaf N levels (~2%), partial defoliation, reflective ground covers, and postharvest foliar urea to maintain bud health. As climate shifts push harvest earlier and heat risk higher, managing the balance between sun protection and color development has never been more important. This session delivers the science and the applied tools to help you get both.