I'm a big fan of sulfur powders as a dusting agent.
Nicotine steeped from a pile of cigarette butts, vegetable oil and dish soap
is a well respected in the organic gardening community.
I'm a big believer in predator insects, Lady Bugs and Preying Mantis.
I've read alot on hops but haven't grown yet, just the regular garden variety plants.
A good mulch, stripping the lower leaves to take the rungs off the ladder and good sun to keep down fungus and rot to weaken the plant's natural resistance