The Armyworm is a common name for several species of caterpillars, particularly from the genus Spodoptera. These pests are known for their destructive feeding habits, primarily targeting crops like corn, wheat, and grass. They can cause significant damage in a short period, often moving in large groups, which is how they got their name. Armyworms are typically green or brown and can grow up to 1.5 inches long. They are most active at night, making them difficult to spot during the day. Farmers often monitor for signs of infestation to implement control measures and protect their crops from these voracious feeders.