What types of pests are typically targeted by rodenticides?

Rodenticides are specifically formulated to target rodents, which include common pests such as mice, rats, and voles. These substances are designed to effectively eliminate these pests by disrupting their physiological processes, often leading to death after ingestion. The use of rodenticides is crucial in managing rodent populations, which can cause significant damage to structures, contaminate food supplies, and transmit various diseases.

The other options represent different categories of pests that require distinct management approaches. Insects like ants and cockroaches are treated with insecticides that are designed specifically for their biological makeup. Weeds and unwanted plants necessitate herbicides that focus on plant growth inhibition. Fungal infections in crops are addressed through antifungal treatments that target specific pathogens affecting plant health. Each type of pest requires targeted control measures based on their unique characteristics and behaviors, highlighting why rodenticides are only applicable to rodents.