The Sustainable Use Directive (SUD) requires that all pesticide application equipment (PAE) is tested on a regular basis*
Any machine applying pesticides  must be tested by the relevant dates. .
Fogging machines applying pesticides  must be tested to the timescales specified below:
SUD and Crop Assurance Requirements
          a. First test due before the machine is 5 years old
          b. Re-test every 6 years
 NOTE - Red Tractor Fresh Produce Scheme no longer requires fogging machines to be tested annually.     
*The legal requirements are contained in the Plant Protection Products (Sustainable Use) Regulations 2012