What is a common fungicidal active ingredient used for seed treatments to control damping-off and seed rot?

• A. Fludioxonil
• B. Glyphosate
• C. Atrazine
• D. Imidacloprid

Answer: (A)

Seed protection against soilborne fungi relies on using a fungicidal ingredient in seed treatments to guard germinating seeds from diseases like damping-off and seed rot, which are caused by fungi such as Pythium and Rhizoctonia. Fludioxonil fits this role well because it’s specifically formulated for seed coatings to prevent these fungal threats during germination, providing early-stage protection by inhibiting fungal development as the seed starts to grow. The other options are not fungicides used for this purpose: glyphosate and atrazine kill weeds (not fungi), and imidacloprid targets insects (not fungal pathogens), so they don’t address damping-off or seed rot.