Are squash bugs harmful to plants and how can they be controlled?

Yes, squash bugs are harmful to plants as they feed on the sap of squash, pumpkin, and other related plants, causing wilting and damage. They can be controlled by handpicking, using insecticidal soap, neem oil, or applying diatomaceous earth around plants to deter them. Regularly inspecting plants and removing eggs can also help prevent infestations.