Avoiding Spray Drift: WA

DAFWA - Government of WA

Type: Article
Knowledge level: Introductory

Farm Table says:

Makes the legislation and regulation easy to understand.

This WA specific resource looks at how to reduce spray drift as well as outlines relevant WA legislation and regulation you need to be aware of.

As a rule of thumb, droplets with a mean diameter of 250µm (0.25mm) or larger do not normally drift. So, by aiming for large droplet sizes, drift is reduced.

Smaller droplets are, however, more economical. They give better coverage for a given volume of spray and provide better penetration of foliage and attachment to leaf surfaces.

Large droplets have other disadvantages; they give an uneven cover of the target plant surface and tend to bounce off leaves. They are also less likely than smaller droplets to stick to vertical surfaces and the underside of leaves.

The structure of the article is:

  1. How to reduce spray drift
  2. Legislation 
  3. Aerial Spraying Control Act, 1966 
  4. ARRPA Regulations, 1976 

Australia - DAFWA - Government of WA
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