I agree with GPS about sulfur and copper sprays being excellent for deterring pathogens on foliage; I primarily use sulfur because it is also linked to enhanced flavor in a variety of crops.
Also, as GPS points out, chlorine is used in sprout production, both on seeds
and to bathe the sprouts before packaging. This is why sprouts are really, really tricky to grow well. But it turns out chlorine isn't quite getting the job done as effectively as in the past. During the rash of sprout-related e. coli outbreaks this year I saw an interview with the president of some sprout growers association in the northeast - he is calling for a new disinfection regime that isn't based on cholrine. I'll see if I can find the interview - I think it was on NPR.