BLOCKER® 4F fungicide is an important foundation fungicide that suppresses persistent soil-borne diseases in potatoes and crucifers. BLOCKER 4F provides soil-applied foundation for management of scab* in potatoes.

*Refer to 2ee for specific directions for use on common scab of potatoes.


  • Versatile and dependable
  • Wide range of application techniques and tank mix combinations
  • In many vegetable crops including potatoes, brussels sprouts and crucifers

Registered States

  • Registered
  • Unregistered

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AMVAC’s website is updated regularly and may not contain the most current EPA registered product label or safety data sheet. Please contact your local AMVAC representative to confirm you have current product information. It is the sole responsibility of the end user to read and follow product use directions and to comply with all federal, state or local laws. This product may not be registered in all states and users are advised to confirm that the product is registered in all states of intended use.