Wasn't aware that fish emulsion helped with soil borne disease, but happy to see it because it's the only fertilizer I use other than all the other organic stuff (Leaves, wood ash, pine needles, compost, etc.)
Detection of High Concentrations of Organic Acids in Fish Emulsion and Their Role in Pathogen or Disease Suppression
Fish emulsion (FE) added to a sandy-loam soil at 1 and 2% rates reduced the viability of
Verticillium dahliae microsclerotia by 39 and 74% in 1 day, 87 and 98% in 3 days, and 95 and 99% in 6 days, respectively.
http://apsjournals.apsnet.org/doi/ab...HYTO-99-3-0274