§ 185.2500 - Diquat.

(a) A tolerance of 0.01 ppm is established for residues of the herbicide diquat (6,7-dihydrodipyrido (1,2-a:2′,1′-c) pyrazidiinium) derived from application of the dibromide salt in potable water resulting from the application of the pesticide for control of aquatic weeds in ponds, lakes, reservoirs, marshes, bayous, drainage ditches, canals, streams, and rivers which are slow-moving or quiescent in programs of the Corps of Engineers or other Federal or State public agencies. These agencies or contractors or licensees under their direct control will make certain that the treated water will not be used for animal consumption, swimming, spraying, domestic purposes, or for irrigation for 14 days post-treatment or until approved analysis shows that the water does not contain more than 0.01 ppm of diquat (calculated as the cation) and that no treatment will be made where commercial processing of fish resulting in the production of fish protein concentrate or fish meal is practiced.

(b) A tolerance of 0.01 ppm is established for residues of the herbicide diquat (6,7-dihydrodipyrido (1,2-a:2′,1′-c) pyrazinediium) (calculated as the cation) derived from application of the dibromide salt in potable water resulting from the application of the pesticide in ponds, lakes, and drainage ditches where there is little or no outflow of water and which are totally under control of the user. The applicator will make certain that treated water will not be used for animal consumption, swimming, spraying, irrigation, or domestic purposes for 14 days post-treatment. For the purposes of this paragraph only (§ 185.2500(b)) these applications of diquat are not to be used in aquatic sites in Florida.

(c) A food additive regulation of 0.5 part per million is established for residues of diquat in processed potatoes (includes potato chips).