How do adulticides function in vector control?

Adulticides function by specifically targeting and killing adult insects to control their populations. This method is essential in vector control strategies aimed at reducing the numbers of adult mosquitoes and other adult insects that can spread diseases. By eliminating these adult insects, the overall population is decreased, which in turn helps to reduce the risk of disease transmission to humans and animals.

The other options do not accurately describe the role of adulticides. While the killing of insect eggs, repelling insects, or targeting larvae are important aspects of vector control, they are not the primary function of adulticides. Adulticides are designed to effectively address the adult stage of insect life, making them a critical component in managing vector populations.