CDFA Pest Prevention Plant Regulation Practice Exam

Where does the adult corn borer typically lay its eggs?

1. On the stalks

2. In the corn silk

3. On the roots of the plants

4. On the underside of leaves

The correct answer is: In the corn silk

The adult corn borer typically lays its eggs in the corn silk, which is the long, thread-like structure that emerges from the ear of the corn plant. This location is strategic for the pest, as the silk is directly associated with the developing ears of corn, providing a food source for the larvae once they hatch. By laying eggs in this area, the corn borer ensures that the newly emerged larvae have immediate access to nourishment, which increases their chances of survival. The other options do not reflect the typical oviposition behavior of the corn borer. For example, while many insects do lay eggs on stalks or leaves, the silk is specifically favored by corn borers for the reasons mentioned. The roots of the plants often do not provide a conducive environment for egg-laying or initial feeding, making them less likely locations for this pest.