I've never seen blackspot on azaleas or hydrangeas. I did have some kind of fungus on my crepe myrtles and I used the Advanced Bayer on it and it helped. I do have an azalea with I think mildew (black on the stalks) and I was going to spray it next time I did my roses. It's been wet and cool here too and I have blackspot on a lot of roses because I didn't spray early enough.

Remember, the existing spots on your roses won't go away with fungicide treatment ... fungicide is preventing NEW spots and limiting your existing infection. Use the Bayer as directed on the label, and you will control our outbreak on future leaves. (I use Bayer Advanced Disease Control spray ... not the drench ... you didn't say which Bayer product you're using.

I have enough leaves on my roses now, so I guess I have a Spray Day in my near future.

Connie

I started in late Feb. with the Bayer soil drench and didn't realize it took 6 weeks to protect the bush and wasn't as effective so BS showed up a few weeks ago. It didn't run rampant though and I sprayed with the Bayer Advanced last weekend and it seems to have mostly stopped it. I don't have many roses that get it, just a few HTs and such. This is the first year I am spraying though so I am experimenting, but the blooms and bushes do look better.

I am not too far from Buford (maybe 20 mi, I am in Roswell). Yes it has been a rainy spring with temps all over the place. I have seen spots on:

Ghislane de Feligonde (not many)
Silver Moon (more than expected but ok)
White Knight (HT)
Chrysler Imperial (HT)
PJP II (HT)
Othello (just a few leaves)
Crepuscule (she's way too big to care)

These plants do not get completely defoliated if I don't spray, but the HT's do look sick by summer and refuse to bloom. I am hoping to improve them this year since I have a small yard and they take up valuable sunny space in the garden. I love the scent of CI and PJP II and I am loathe to shovel prune if I can help it.

notrafficinga (maybe that was true last week, but certainly not this one:)

I used to use the Bayer drench. By itself, it's not completely effective against blackspot. It will help, but I found I still had to spray. At the time, I was spraying with Daconil. The Bayer drench also got too expensive for me when I had more and more roses. And I didn't want to have all that insecticide.

The Bayer Advanced disease control is much more effective.

Don't use the Bayer 3 in 1 or 2 in 1. Use the Bayer Advanced Disease Control for Roses, Flowers, and Shrubs.
and spray regularly as directed on the label. It's not a one time spray, it has to be done regularly all season.

I have 2 tree roses that always seem to have black spot. I am using Bayer advanced. I tried the baking powder thing last summer and within 2 days both trees were severely infected. I cut all the leaves off and stared all over. With nothing to lose at the point and they came back healthy and then the black spot started all over. I have also since moved them to s place that get more sun and breezes. I have a climbing rose and knock out that have never had black spot. I noticed after posting that my Azalea's started putting off new leaves that look very healthy what I was seeing was old leaves and they have some black spots on them maybe from the winter. Hydrangea is just beginning to come up and I saw a few leaves with black on the tips but overall the hydrangea is looking healthy. Our soil is red clay so I amended each plant when planted (a year ago) with some garden soil, used coffee grounds and used tea bags. I have some black kow I have been thinking about adding a small amount to each plant what do you think?
I am a newby so forgive me for my original posts.

Fungicide is used on a regular schedule to prevent blackspot from happening ... it's not perfect, but it makes a significant difference on roses that are susceptible to bs infection. Go to Lowes or your local specialty nursery and buy a blue bottle of Bayer Advanced Disease Control (the exact name). If you don't have one, also buy a pump sprayer. For so few roses, you can get away with the little half-gallon hand-held one. Mix the Bayer according to the label directions and spray your roses every 14 days to prevent new blackspot from showing up. If you already have active infection, remove the affected leaves before beginning treatment. If you stick with this routine, and keep your roses well watered, they should look good all season.

If you have any questions, you are welcome to send me a private message via My Page.

Connie

What Connie said! As I said, I was lax in beginning spraying this year and started to see a lot of blackspot, and not just on the usual suspects. I sprayed the Bayer and again the next week. I am happy to report that the problem has not spread and I've stopped seeing new leaves with problems. After the first spray, you will likely see more because the infected leaves haven't show up yet. But if you spray the following week, that should do it. Then stay on an every 2 week schedule. In late July and August when it gets very hot, I can go 3 weeks between spraying because it is too hot for the spores to survive. But as soon as it cools off, you have to do every 2 weeks until first frost. There are other fungal diseases like anthracnose that will take hold in the cooler fall weather.

I agree with all here that the Bayer Advanced Disease Control is more effective than the all-in-one drench. This is the first product I have come across that seems to stop BS in its tracks. Once the infected leaves come off no more get infected. Since I am new to spraying and have so few plants that spot I have been using a spray bottle. I do shower afterwards. If it continues to work I will invest in a decent sprayer since I am likely to acquire more roses.

Buford I was wondering about the hot summers and being able to stop spraying for a few weeks. Number one - the heat is unbearable for more than a few minutes. I KNOW i won't get out there unless it is to spray one or two prized bushes. Number two - we are usually pretty dry all summer long. When do you pick it back up in fall?

notraffic, usually September, not really fall, but the days get a bit shorter and I worry about it. I play it by ear based on the temps and the amount of rain we get. I did read somewhere that it's a good idea to spray once or twice during the winter, sort of like a dormant spray. One winter, it stayed so mild, I had black spot all winter long. It was awful. I kept waiting for it to get cold and the leaves to drop but they didn't.

I went to NYC this past weekend and came back to Cercaspora on half my HTs in one area........Spraying this evening! BTW I believe it affects Azaleas and Camellias and looks a LOT like Black Spot.

Yeah, I do have spots on some of my azaleas. I did think it was early for BS. So maybe what I have is also cercaspora.

I thought I was the only one to get blackspot this early on my roses and I've been spraying weekly as soon as the leaves came out! Usually my favorite spray is Spectracide for disease control but it's not doing to good this year.

I looked at some pictures on the internet of Cercospora and yes I saw this last year on many of my plants and now it is back. I live on one acre and my holly is on one side of the property my hydrangea on another and both look like they have Cercospora. last year my tomato in the back of the property had some kind of leaf fungus. So basically it is everywhere. I do not use sprinklers and always water below. I did not fertilize last year except once because I was using coffee grounds banana and egg shells instead.
Also some of my plants have no mulch and some have cedar and some pine nugget's. I am trying to find a common link as to why so many plants in different places are getting this but so far I am coming up empty.
Any idea's on what I can do about it.
My soil is red clay and I amend and recently added black kow.

Whatever you're seeing on your azaleas and hydrangeas, it isn't blackspot. Blackspot is a particular species of fungus (Diplocarpon rosae). It only infects roses. It isn't able to infect azaleas or hydrangeas because those plant species are so physiologically different from roses the fungus can't infect them.

Many fungal diseases are like this. Many species of fungi are only able to infect one species, or the species of just one genus. (There are others that can infect many plant species, but blackspot just isn't like that.)