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Seven tips for better potato planting


In-furrow fungicides are applied to the soil furrow to protect growing potato plants from important soil-borne diseases. The key potato diseases we target include: Pink Rot (Phytophthora erythroseptica), Rhizoctonia/Stem Canker/Black Scurf (Rhizoctonia solani) and Silver Scurf (Helminthosporium solani).

One of the major benefits of using in-furrow fungicides, either on their own or in combination with a potato seed treatment like VIBRANCE® PREMIUM, is that you provide protection to the stolons, roots, stems and tubers against fungal disease in soil. Managing these diseases can enhance the evenness of emergence, tuber size, clean skin finish, processing quality, visual appearance and marketable yields.

In-furrow fungicides from Syngenta. When applied correctly delivers superior control within the potato root zone.

However, choosing the right product is only part of the story! For any application to be successful you need to apply it correctly and to the optimum zone of soil in order to maximize the efficacy of your crop protection program.

Consider these top tips for setting up your potato planter for effective in-furrow fungicide application.

  1. NOZZLE CHOICE: Use the Syngenta AMISTAR® In-Furrow Nozzles if you have them. They come in a set of two; the front nozzle is the AZ IF 20-124 and sprays a narrow 20º spray angle to get down to the bottom of the furrow, while the rear nozzle is the AZ IF 70-124 and sprays a wider 70º spray angle in order to get effective coverage of the furrow mould as it is being closed over.
    1. These will require the fitting of a hollow cone bayonet cap.Syngenta Amistar spray nozzles as available through Potato Partners.
  2. POSITIONING : Syngenta best practice recommends two nozzles be used to apply AMISTAR® Technology and RIDOMIL GOLD® 480SL
    1. The front nozzle should be mounted at the front of the planter inside the opener so the spray is applied as a 15-20 cm band just before the seed is dropped in to the furrow.
    2. The rear nozzle should be angled to spray slightly backwards in order to spray the soil as the furrow is closing (bow wave).
    3. Two nozzles always provides the best disease control, however if you can only mount one nozzle, ensure the rear nozzles is correctly fitted and applying the fungicide to the area of “maximum soil mixing” – see illustration (below).Positioning Syngenta Amistar in-furrow nozzles.Correct rear spray positioning to ensure good soil mixing for in-furrow application of Syngenta Amistar
  3. AGITATION: You should have good agitation in the application unit, I recommend that the agitation (L/min) of at least 10% of combined tank capacity (L) + nozzle output (L/min).
    1. Eg. a 100 L tank and 4 nozzles applying 0.8 L/min total, require a pump with a minimum output of 10.8 L/min, at normal operatingpressure.Tank agitation must be used while applying Amistar.
  4. FILTRATION: For filtration of the unit I prefer that you use 100 mesh x2 filters in the circulation system
    1. If you can, please avoid using nozzle filters.
  5. SYSTEM: Use as small a bore pipe as possible for spray lines from you valves to the AMISTAR In-Furrow nozzles. This keeps the speed of the liquid up through the system and helps to prevent caking in the pipes.
  6. CLEANING: After each day, wash out spray system, clean all nozzles and all filters, leave nozzles in bucket of water overnight and leave with clean water in circulation system. Yes... I said seven tips, but consider this a bonus:
  7. REVIEW and CALIBRATE: Remember, just like a boom spray, it’s important to ensure that your In-furrow setup is doing the best possible job throughout the season. Check the positioning and output of the nozzles regularly and adjust them depending on product rate, water volume, soil flow and conditions.Periodic checks of how the in-furrow application of Amistar is being applied is recommended.

For our full Potato Establishment Guide and for more information on AMISTAR and RIDOMIL GOLD 480SL click here.