In the growing of crops for consumption, the removal of pathogens by the addition to irrigation water for the crops of an anti-pathogen compound and supplying this to the crop prior to harvest whilst normal irrigation is effected. The anti-pathogen material is based on halogens such as chlorine, bromine and iodine or mixtures of halogens or halogens combined with otherorganic radicals including cyanurate, hydantoin, peroxide and chlorine dioxide. BCDMH and TICA are preferred anti-pathogen and they may be added to a carrier concentrate and measured and dosed into the irrigation water.
