I used it 1 Tbl. to 1 gal. with a bit of natural soap all summer long and it worked fine. I've never read it will cause leaf burn, only the lime sulphur mix, but I could be mistaken. Also, what I read to rinse off was also Lime sulphur, not just wettable sulphur on its own. It did help. I also use baking soda. Of course, one has to reapply when it rains and that's where I fell apart as it never seems to stop raining. : (

Lime sulfur is harsher than plain sulfur and it is not any more effective. I never use it. They got the idea from Bordeaux mixture which mixes copper with lime, and that case the result IS more effective. Bordeaux of course is a dormant season only spray -- and paints the canes blue for a while.

There is a growing season form of sulfur. One brand is 'Safer' fungicide. There are some caveats. I think there is a temperature range that is safe but I don't remember what it is. Also as I recall do not use any horticultural oil within two weeks of spraying sulfur before or after. The combination is said to cause leaf burn.

I have used light yellow color (not wettable?) sulfur mixed with soap and water to treat BS before. I only sprayed it when the temp was under 75 F. I also used liquid copper spray last year at the country gardens for fruit trees and roses. Will take some sulfur to the country this season, it's much cheaper than copper spray.

Did one work better than the other?

They all work for BS. The sulfur makes some mess -you’d see spots/stains on leaves, and I have to do the shake dance ( I don’t think the sulfur I got is wettable type). Lol But the sulfur was cheap, I got 40 lbs, it would last a long time for all the roses under my care...,,,,one way to lose weight, shake, shake, shake. :-)

Thank you all for sharing. I think what I’m going to do is to dust sulfur on the soil at the base of each rose, as most roses in my garden already have buds on them. And once the leaves are out, I will mix the dust with water and spray the leaf surface and stems. And that’s it. I got a 25-lb bag so it should last me for a little while. It’s a rainy cold day out but received my orders from Edmunds (soaked in water overnight) so going to plant them today. Yay!

By the way, I know gardeners in China and Japan use lime sulfur to treat during dormancy. They said lime sulfur cannot be applied once broken dormancy. I think it’s because like Rosefolly said, lime sulfur is much harsher than sulfur and it burns the buds and young leaves.

I'll lok for another recent post on this subject referencing Mr. Zimmerman I think it's on this site. ZZZone, add a bit of natural soap to help the sulphur stick to the leaves. I use zote grated and melted with boiling water and left until it forms a gloppy mess. Just add some of that or spend the big bucks on Dr. Bronner. Any non-detergent soap, so probably the natural dish soaps would work as well. I'm just cheap. I also make my own soap so I use that too. I've been toying with the notion on using fragrant soap to repel insects, but I'm not sure if that would work. I've never read any studies on it. P.s. From where did you buy a 25lb. bag!

@ vaporvac The soapy water is a good idea. I found the 25 lb bag from Tractor Supply.