Oak Trees Delay Leaf Emergence 3 Days, Cutting Caterpillar Damage 55%
Updated
Updated · SciTechDaily · Jun 9
Oak Trees Delay Leaf Emergence 3 Days, Cutting Caterpillar Damage 55%
3 articles · Updated · SciTechDaily · Jun 9
Summary
A three-day delay in spring leaf emergence after heavy infestations left newly hatched caterpillars without food and cut feeding damage by about 55%, an international team reported.
Nature Ecology & Evolution published the study, which found the timing shift can outperform chemical defenses such as tannins because trees avoid the higher energy cost of boosting leaf toxins.
Sentinel-1 radar data across 2,400 square kilometers of Northern Bavaria tracked 137,500 observations from 2017 to 2021, with a 2019 gypsy moth outbreak showing which trees were stripped and how they responded the next year.
The findings suggest forests do not leaf out based on weather alone, and models that ignore plant-insect interactions may misread spring timing as climate change pushes trees earlier while herbivore pressure pulls them later.