Official definition of a minor use in the European Union under the Regulation (EC) No 1107/2009 – Article 3(26):
'Minor use' means use of a plant protection product in a particular Member State on plants or plant products which are:
(a) not widely grown in that Member State, or
(b) widely grown to meet an exceptional plant protection need.
By this definition, all uses on minor crops can be considered as minor uses, and a use on major crops can be considered as a minor use in specific conditions. No quantitative criteria are specified. Quantitative criteria and/or additional criteria might be used depending in the country.
Definition of a harmful organism (Reg.1107/2009; Art.3 (7)): any species, strain or biotype belonging to the animal kingdom or plant kingdom or pathogenic agent injurious to plants or plant product .