The tomato in Figure 1 has a disease known as anthracnose. This disease is caused by a fungus that probably splashed on the tomato before you harvested it. Although the tomato looked healthy when you harvested it, the fungus had probably already infected the tomato. This infection expanded while the tomato sat quietly on your kitchen counter. Before the fungus splashed on your tomato, it probably survived on crop residue from a tomato or pepper plant from a previous year. If it is possible to cut the lesion out of the tomato, go ahead and add it to your salad.