Two invasive pests/diseases have recently moved into the DC area and are causing problems for trees and agricultural crops. Here’s what you need to know about them to help monitor and mitigate their spread. The spotted lanternfly is an invasive insect that feeds on the sap of a wide range of fruit, ornamental, and woody tree species. One way this impacts the host plant is by reducing available resources, causing the plant to die back and produce a lower quality and quantity of crops. The insect has spread widely by laying eggs on vehicles, agricultural equipment, and trailers, which are then transported over long distances.