Which of the following is a common sign of a spider mite infestation?

A common sign of a spider mite infestation is indeed the presence of webbing on plants. Spider mites are tiny pests that produce fine webbing, often seen on the undersides of leaves and between stems. This webbing serves multiple purposes: it can help protect the mites from predators, facilitate movement, and sometimes even aid in the capture of prey.

In addition to webbing, spider mites can cause damage to plants that may manifest as stippling or discoloration on leaves due to their feeding habits. This damage might contribute to other symptoms like yellowing leaves or wilting stems, but webbing is the most distinctive and recognizable sign of their presence. Understanding the specific indicators of various pests, such as spider mites, can help in accurately diagnosing an infestation and implementing the correct management strategies.