Code of Practice
Farmers are required by law to take all reasonable precautions when using pesticides to protect the public and the environment.
Guidance on how to comply with legislation is given in the statutory Code of Practice for Using Plant Protection Products, which applies to all professional users of pesticides.
A professional pesticides is one intended for professional use eg. agricultural or amenity as opposed to home and garden. Always read the label and if in doubt ask if the product is for professional use or not.