Illinois Field Crop Applicators Practice Test

What type of damage is caused by black cutworm larvae to corn seedlings?

1. Cutting of leaves and stunted growth

2. Feeding on roots and root hairs

3. Coating tassels and silks with honeydew

4. Stalk tunneling and ear tunneling damage

The correct answer is: Cutting of leaves and stunted growth

The damage caused by black cutworm larvae to corn seedlings is primarily characterized by the cutting of leaves and stunted growth. Black cutworms are known for their feeding habits, which typically involve cutting off the seedlings at or just above the soil line. This can completely sever the plants, leading to their wilting and eventually death if the attack is severe. In addition to cutting the seedlings, the activity of these larvae can result in stunted growth for any plants that survive the initial cutting. This is because the plants may be stressed from the damage sustained, impeding their ability to grow properly and compete for nutrients and sunlight. Although other types of damage, such as feeding on roots or causing honeydew secretion, are associated with different pests or developmental stages in other crops, they do not specifically pertain to the black cutworm's impact on corn seedlings. Therefore, the correct characterization of the damage they inflict aligns precisely with the cutting of leaves and consequent growth impairment.