Armyworms are not harmful to humans. They are caterpillar larvae that primarily cause damage to crops, grasses, lawns, and plants by feeding on them. While they can be very destructive to vegetation, they do not pose any direct threat to human health. However, some individuals may experience skin irritation or allergic reactions if they come into contact with the caterpillar's hairs. Overall, armyworms are an agricultural pest rather than a health hazard to humans.
