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Pesticide Use in High Tunnels

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A high tunnel is a single or multi-bay walk-in structure without a foundation, typically covered with impermeable material and set over crops in a field.

This is different from a greenhouse. A greenhouse is a permanent, enclosed, walk-in structure where crops grow in a media on elevated benches, containers or troughs placed on the ground. Farmers control the environment, such as temperature, humidity and ventilation, and pesticide drift stays inside the greenhouse.

Pesticide labels don’t have specific directions for use in high tunnels. You may use pesticides with directions for either greenhouse or field uses for a specific pest and crop. If possible, choose a pesticide that has directions for both field and greenhouse uses.

A high tunnel environment is unique. It is neither a greenhouse nor a field.  When using pesticides inside high tunnels, remember that:

  • pesticide residues could breakdown more slowly,
  • crops could be injured more easily, and
  • Certified Farmers and Farmer Assistants could have increased exposure.

    • Take precautions:

    •  Wear the most protective clothing and personal protective equipment stated on the label or use a closed cab to reduce exposure.
    • Apply pesticides registered for field crops when the cover is off the high tunnel.
    • Use the longest Restricted Entry Interval (REI) and Pre-Harvest Interval stated on the label for greenhouse and/or field use. If an REI is not stated, use a 12 hour REI.
    • Test for the possibility of crop injury on a small area before treating the entire crop.
    • Prevent the spray from drifting outside the high tunnel when using a pesticide registered for use only in a greenhouse. If possible close the sides and ends of the tunnel.
    • Follow the buffer zones if using a pesticide registered for field crops.