If you wait the BS might take over. If not you think you may burn the leaves?

If it were between those 2 choices I'd spray it w/ a different fungicide. You need to rotate the fungicides. I use Mancozeb for when I have active BS, Immunox, when I have thrips, & Banner Maxx as a preventative spray. Remember to spray underneath the leaves as well.

Also, try not to overhead water. Water at the base of your plant. Keep those leaves as dry as possible.

I do get BS every year, I've come to the point where I don't stress about it. I do spray though.

This is what I would do. I hope your plants make it & bloom beautifully for you this summer:)

Betty

When you use any type of sulfur product, it's best not use within 30 days of an oil product. An alternative may be not to use End All and use Safer's Soap if you can get it, or just wash the aphids off the plant. Aphids will come and go, but when disease shows up it's usually here to stay and will get worse.

Mancozeb and Banner Max are only available commercially and not to the home gardener in Canada. Which means, it can be used by commercial growers but not used by the backyard gardener. We can smell clean unpolluted roses, but the food crops can be pretty iffy!!! Makes a lot of sense eh!

Are copper-based fungicides available in Canada? These are certified organic in the US, but are not as safe as sulfur. They would be compatible with the oil.

As missflippins says, in the long run you can use soap instead of oil and continue with the sulfur product.

In the short run, you might try to wash off the oil by spraying very thoroughly and repeatedly with 1 TB dish soap / gallon. Then rinse and apply sulfur to a test area on at least two different plants, areas in full sun (south side of the plant). Severe damage would be apparent in two days or minor damage in 7-10 days. It shows as tan dry patches.