On what basis are fungicides primarily classified?

Fungicides are primarily classified based on how they protect the plant, which is the correct basis for classification. This categorization reflects the mode of action of the fungicides and how they interfere with the growth or reproduction of fungi. There are several types of action, including prevention (protectants) and treatments (eradicants).

Protectants are designed to prevent fungal invasion by creating a barrier on the plant surfaces, while eradicants are used to control existing infections by killing the pathogens or inhibiting their growth. Understanding how fungicides function is essential for effectively managing plant diseases and ensuring the appropriate application for different situations.

Other classifications based on cost-effectiveness, color and formulation, or geographical usage do exist in various contexts but are not the primary basis for classifying fungicides concerning their function and efficacy in plant protection.