CDFA Pest Prevention Plant Regulation Practice Exam

During what time of year does the adult European corn borer lay eggs?

1. Spring

2. Summer

3. Fall

4. Winter

The correct answer is: Summer

The correct choice indicates that the adult European corn borer lays eggs during the summer months. This timing is crucial for the development of the pest, as summer provides the warm temperatures that facilitate the growth and survival of the larvae after the eggs hatch. The life cycle of the European corn borer is closely tied to the agricultural calendar, with peak egg-laying occurring when corn plants are actively growing, ensuring the larvae have ample food supply upon hatching. This strategic timing helps maximize the chances of survival for the young caterpillars. During spring, the adults are typically emerging from their overwintering sites and are just beginning their reproductive cycle. Similarly, fall typically marks the end of the corn-growing season when egg-laying would not be beneficial since the crop would no longer be present for food. Winter, being a dormant period for this insect, also does not coincide with any reproductive activity as the adults are either inactive or dead.