There is a good website set p by the Crop Protection Association -
http://www.garden-care.org.uk/
There is a page where you can enter a problem and some details and it
advises what products are available for the home gardener. It does it
by retail product name rather than active ingredients. That page is
http://www.garden-care.org.uk/GardenCare/default.asp. Also has organic
options too.
Clifford
Bawtry, Doncaster, S Yorkshire