United States PPCPs used

Some antibiotics are also used in horticulture to control contamination of micropropagation, plant tissue culture, and in controlling bacterial diseases of fruit trees (Levy, 1992 FaUdner, 1998). Commonly used in horticulture are cephalosporins, neomycin, novobiocin, polymyxin, and sulfaguanidine. More than 20 tons of streptomycin and tetracycline are used by the horticulture industry in the United States per annum. Substantial amounts of antibiotics are also used in aquaculture, whereby they are either directly added to the water (therapy) or as part of the feed, resulting in high concentrations in the water and adjoining sediments. An examination of the levels of use of various PPCPs for various purposes is outline next. 

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