The redhumped caterpillar is a familiar pest of fruit and nut trees such as plum, almond, cherry, and apple, as well as ornamental trees like liquidambar and birch. These caterpillars can reach high populations in our area, sometimes defoliating entire branches or entire trees.

The newly revised Pest Notes: Redhumped Caterpillar, authored by Area IPM Advisor Emily Symmes and Steve Dreistadt, UC Statewide IPM Program, describes the pest, its life cycle, and how the insect damages plants. The peer-reviewed publication also describes management techniques, including use of insectary plants, cultural controls, and biological control.