Oak Trees Delay Leaf Emergence

An international research team, led by Soumen Mallick from the University of Würzburg, discovered that oak trees delay their leaf emergence by three days in the spring following a heavy caterpillar infestation. This strategy significantly reduces caterpillar survival rates and feeding damage by 55%. The study, published in Nature Ecology & Evolution, utilized Sentinel-1 satellite data to monitor a 2,400-square-kilometre area in Northern Bavaria over five years. This finding fundamentally changes the understanding of how trees respond to biological threats, moving beyond passive reactions to weather. It highlights the forest's resilience and adaptability in an evolutionary tug-of-war between climate change-induced early sprouting and insect pressure to hold back.