CDFA Pest Prevention Plant Regulation Practice Exam

What stage of development causes most of the damage for the European corn borer?

1. Adult Stage

2. Pupal Stage

3. Egg Stage

4. Larval Stage

The correct answer is: Larval Stage

The larval stage of the European corn borer is responsible for the majority of the damage to corn plants. During this stage, the larvae, which hatch from the eggs laid by the adult moth, actively feed on the plant tissues. They are particularly problematic as they burrow into the stalks and ears of corn, causing structural damage and impairing the plant's ability to transport nutrients and water. This feeding behavior can lead to significant yield loss and increased susceptibility to secondary pests or diseases. In contrast, the adult stage is primarily focused on reproduction, while the pupal stage is a transition phase where the larva undergoes metamorphosis and does not cause any damage to crops. The egg stage involves the potential for future infestation, but it is the larvae that actively cause harm during their development. Therefore, targeting the larval stage is critical for effective pest management strategies in corn production.