Have you observed foamy wet blobs on your landscape plants in early summer? If so, it is likely spittle bugs. Spittle bugs are small leafhopper-like insects that feed on plants. They can often be found on Leyland cypress in landscapes but can be on other plants as well. Females lay eggs on plants and the eggs hatch into larvae that suck sap from the leaves. The larvae excrete a spittle-like foam that protects them from predators. The good news is that these insects are harmless to plants. There is only one generation per year. There is not need to use an insecticide to protect plants.