Which statement about fungicides is true?

Which statement about fungicides is true?

• A. Pathogens can sometimes become resistant to systemic fungicides
• B. Fungicides are always effective
• C. Fungicides cure all plant diseases
• D. Fungicides should be applied only to healthy plants

Answer: (A)

Pathogens can sometimes become resistant to systemic fungicides. Because these products move inside plant tissues, fungi exposed throughout the plant face a consistent chemical challenge, which can lead to the selection of resistant strains over time. That’s why using fungicides as part of an integrated plan—rotating products with different modes of action, applying at the correct times and rates, and combining chemical control with good cultural practices—is essential to maintain effectiveness. Fungicides are not guaranteed to work in every situation; their success depends on timing, weather, coverage, and the biology of the pathogen. They do not cure all diseases and are often used preventively or to slow spread rather than to erase an existing infection. Applying fungicides only to healthy plants isn't a universal rule either, since protection is also important for susceptible or at-risk plants and at the early signs of pressure, following label directions.

Pathogens can sometimes become resistant to systemic fungicides. Because these products move inside plant tissues, fungi exposed throughout the plant face a consistent chemical challenge, which can lead to the selection of resistant strains over time. That’s why using fungicides as part of an integrated plan—rotating products with different modes of action, applying at the correct times and rates, and combining chemical control with good cultural practices—is essential to maintain effectiveness.

Fungicides are not guaranteed to work in every situation; their success depends on timing, weather, coverage, and the biology of the pathogen. They do not cure all diseases and are often used preventively or to slow spread rather than to erase an existing infection. Applying fungicides only to healthy plants isn't a universal rule either, since protection is also important for susceptible or at-risk plants and at the early signs of pressure, following label directions.