In-crop herbicide use

Published: 1 Oct 2019

The mode of action (MOA) of the chemical being applied and the crop situation determine the water volume and droplet size and how a sprayer should be set up. It is also important to know how a product enters the plant and how it is translocated within the plant to determine where the spray coverage is required and what adjuvants may assist with the uptake of the product into the plant.

Application considerations for in-crop herbicide use:

Key points

  • Knowledge of a product’s translocation and formulation type is important for selecting nozzles and application volumes.
  • Evenness of deposit is important for poorly or slowly translocated products.
  • Crop growth stage, canopy size and stubble load should influence decisions about nozzle selection, application volume and sprayer operating parameters.
  • Robust rates of products and appropriate water rates are often more important for achieving control than the nozzle type, but, correct nozzle type can widen the spray window, improve deposition and reduce drift risk.
  • Travel speed and boom height can affect control and drift potential.
  • Appropriate conditions for spraying are always important.

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    Region: National