Well, Captan is a sulfenimide fungicide which widely used for the control of scab and leaf spot on many fruits, vegetables and ornamentals, and on turf. It is fairly persistent on crop surfaces. It is also widely used as a seed dressing, particularly on peas, and as a pre-planting soil fungicide. Generally speaking, it is not a growth regulator. http://www.guidechem.com/cas-133... Maybe this page is helpful to you.
Captan is also used as a growth regulator. Besides being a fungicide, Captan ensures that the plants have a healthy growth due to its pesticide mixture and this means it regulates growth. Get more information on http://www.epa.gov/ttnatw01/hlthef/captan.html.