What is the primary use of avicides?

Avicides are specifically designed to control pest birds that can cause significant issues in various environments, such as agricultural fields, urban areas, and airports. These birds can lead to property damage, contaminate food sources, and pose health risks through their droppings. The primary function of avicides is to reduce or eliminate populations of these problematic birds in a safe and effective manner.

The other options refer to different categories of pest control. For instance, controlling fungi would involve fungicides, while herbicides are used for managing weedy plants. Additionally, ticks and mites fall under the category of arachnids, which require different types of pest control strategies that are distinct from those used for birds. Therefore, avicides are specifically targeted for avian pest management, making them the correct choice for this question.