Dendroecology II Insect Outbreaks Wisteria Princess Tree (Paulownia) Gall Wasps Insect Outbreaks dendroentomology: The science that uses tree rings to date and study the past dynamics of insect populations. Besides fire suppression, climate change increases insect outbreaks? Close-up of a cross section of a ponderosa pine (Pinus ponderosa) from Oregon, showing periods of growth reduction caused by Pandora moths. Note the narrow rings that begin around 1631, 1661, and 1677. Sudden Oak Death Bleeding cankers on tan oak Leaf dieback in rhododendron Sudden Oak Death Gypsy Moth Male Female Gypsy Moth