Adult females will lay eggs on decaying plant matter after they emerge from overwintering. The eggs hatch sometime in June or July and the larvae feed on whatever plant material is near them until they pupate. Once they become adults, they seek out food sources. Vegetation damaged earlier in the season by other types of insects, like beetle or moth larvae, allow the Four-Spot Sap Beetle to immediately begin feeding at the areas of the existing wounds. They are secondary invaders of many types of important agricultural crops like corn and strawberries. Large numbers of them have been known to spread a fungal infection to the crops which further reduces a healthy harvest.