posted 6 years ago
I personally cured my rust problems I had had for years, this year with regular organic sulfur applications, followed up with next day compost tea applications. I repeated the sulfur treatment for 2 weeks, once per week; and am currently maintaining with bi weekly compost tea applications.
This worked on hollyhocks, lillies, irises, and blueberries. Honestly, I am going to dig up all the flowers and move them somewhere they don't get shade all morning, which tends to encourage rust and other pathogenic infections.
As for the blueberries, they really responded well to the sulfur spray. I also read somewhere that blueberries perform well growing among turf grass, so I dug up some St. Augustine that I would have otherwise composted and sodded around one of my blueberry plants early this year, before the rust had taken hold. This plant did not get any rust. It did have some stunted growth compared to the other plants, but the foliage was much healthier with a deep, dark, green, and more symmetrical growth. I realize this is a bit anecdotal, but I honestly don't have enough room for all the plant experiments I have dreamed up in my head.
I am interested to see if applying only the compost tea would have done the same thing.