The Bayer all-in-one is a soil drench product No telling how long it takes for the fungicide in it to be taken up by the roots to give adequate protection against blackspot. As you know, this product also contains an insecticide. Why not just spray a systemic fungicide, such as the Bayer Disease Control for Roses, Flowers and Shrubs? It's my understanding that once this fungicide (same one, tebuconazole, that's in the soil drench product) dries on the leaves, it is not removed by rain to any great extent - and you'll be doing just what you want to do without placing extra toxins in your garden.

I think that's what I will do Mike. I have a friend who loves the all-in-one product, but I don't need an insecticide, & it sure sounds like alot of mixing & watering for someone like me who has 60+ roses. (Not to mention expensive!)

Hi Peggy. I should have added that I think the sprayed fungicide also gives more consistent control of blackspot compared to the soil drench, based mostly on what people posted last year on the Forum.

It is my understanding that it takes a week.

I'll second Mike. Use "Bayer Disease Control for Roses, Flowers and Shrubs," and never use any of those "all in one" types Bayer puts out.

The only problem I have with Bayer Disease Control is that it isn't readily available at places like Home Depot or Wal-mart. I have to get mine at Lowes. So if you can't find it at your favorite place, see if you can find a Lowes.

Kate

I was going to say just what Kate already did. You can get it at Lowes. One other plus for the Disease Control formulation is that it is far more economical. For about the same price, you'll get many many more treatments. Sure, maybe it's not as convenient at just pouring it in the soil, but its more effective, better on the environment because of less chemical applied, and you won't end up chemical-burning the roses, like I did twice with the all-in-one (the problem for me was the fertilizer, which is overkill if your plants were already fertilized.

I agree with Miss Kate also

akarinz, no. Minimum 6 weeks (during which you'll need to start a regular fungicide application anyway) but no one really knows for sure.

Ditto Mike R and Kate, go with the fungicide-only product.

peggy, I used to use the all in one drench. I still had to spray. So now I just use the Bayer Advanced Disease Control (make sure that's what the label says) because like you, I don't need insecticide, at least not all the time.

The spray is wonderful, if you spray once they leaf out, then go on a every 2-3 week schedule, you will never have black spot. I can go longer when it's very hot/dry (July, August) and I keep spraying up until a hard frost. I even do one in mid-winter. Ann has posted something about spraying fungicide on dormant roses to make sure they don't carry the spores over the winter.