Fungicides are primarily used to prevent which of the following?

Fungicides are specifically designed to combat fungal pathogens that cause diseases in plants. Many plant diseases, such as leaf spots, blights, and root rot, are caused by fungi, and these can significantly impact crop yield and health. The primary purpose of fungicides is to prevent or control these diseases, ensuring the plants can grow optimally without being hindered by infection.

While other choices address different types of pest problems—such as insect infestations, weed control, and mite infestations—these issues are managed by different types of pesticides. For example, insecticides are used for insects, herbicides target weeds, and acaricides are typically employed to combat mite problems. Hence, the primary indication of fungicides is their effectiveness against plant diseases caused by fungi.