Black spot is caused by a fungus, the spores of which are in the air waiting for hot humid wet weather. Blackspot can be prevented buy regular use of a good fungicide beginning at leafout in spring. Fungicides are not onetime use products and few will cure blackspot. Once the spots are there, they'll stay even if you happen to cure the disease. Many are reporting good results with Bayer's Advanced Disease Control for Roses, Flowers, and Shrubs. It's one of the few readily available products that will kill blackspot but you must spray it regularly as directed on the label. Do not use the All in One, 2 in 1, or 3 in 1 products.
You can pick up an inexpensive pump up sprayer at WalMart or other big box store.
A far as the holes in the leaves, they're caused by insects, worms or caterpillars. Ignore them and soon predatory insects or birds will eat them. Insecticides are toxic and kill everything they come in contact with.
You can squish them if you see them. That's a great non toxic cure.
Bugs got to eat also! They may put a few holes in the leaves but they won't kill the rose bush.
Many caterpillars are baby butterflies. Killing them kills butterflies.

Woody, Karl's advice, as always, is spot on. When you mentioned holes in the leaves, did you mean holes in the center of the black spots? If so, your fungal disease is probably either anthracnose or cercospora rather than blackspot. These two diseases tend to have a minor impact and many people just ignore them and, if they can't, Karl's advice works for all three diseases.

I have the Bayer Advance Disease Control. It worked wonders from my two tree roses. They were convered in blackspot including the actual blooms.

I feel your pain, Woody. I have an Alchymist climber in my yard that is the sole recipient of black spot! I got it from Antique Roses in Texas, and that poor plant lost about 3/4s of its leaves to blackspot while I was away on vacation for a few weeks this summer. Never saw it on an Alchymist before, such a disappointment. I *hate* blackspot. I'lll be picking up some Bayer's ADC as my regular program isn't doing much.

I picked up some fungicide with mostly sulfur in it,about 46% I think.most other stuff have hardly any sulfur content.Can't find the Bayer's ADC around these parts,what are the major ingredients so I can compare to other pest control products here.BTW thanks for the input.

woody, I can buy Bayer's ADC only at Lowe's. Got one of them around your area?

Or google Bayer products--any basic search should bring up their webpage and you can order it from them--or determine the ingredients for that matter. However, do not fall for Bayer's 3 in I, 2 in I, or All in one type products. Avoid them.

I don't think you will find the mostly sulfur sprays very satisfactory.

Kate

Bayer Disease Control contains tebuconazole. The other highly effective fungicide is propiconazole, found in Bonide Infuse, Honor Guard, and Fertilome Systemic Fungicide. Mail order if necessary. As Karl says, avoid the combo products.

hey guys which version of BADC do you use? There are alot of varieties,can you check this site out and tell me which would be the best to buy;
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Bayer+Advance+Disease+Control&x=0amp;y=0
BTW I can't find an online store in canada that carries it,not even amazon.ca!

Link to the product. I don't know if it's approved for Canada, but you can check the other products I named, or google propiconazole canada.

Here is a link that might be useful: Bayer DC

hey guys which version of BADC do you use? There are alot of varieties,can you check this site out and tell me which would be the best to buy;
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Bayer+Advance+Disease+Control&x=0amp;y=0
BTW I can't find an online store in canada that carries it,not even amazon.ca!

Use the product that michaelg linked to.

Do not buy any of the others, especially avoid (to repeat the above advice) any of the ones that have names like three-in-one or two-in-one or all-in-one.

I seem to remember posts in the past stating that Canada doesn't allow the Bayer products. If so, you might be able to get one of the alternatives: Bonide Infuse, Honor Guard, or Fertilome Systemic Fungicide.

Kate

Can the fungicide be sprayed when temps are over 90 degrees? I live in Louisville, Ky and our temps have been over 90 degrees for the past 15 days, with no relief in sight. I have not sprayed, fearing the leaves would burn.

Betty

Betty, the fungicides recommended here can be sprayed in summer. I think it's safest to spray in the morning, after watering if needed. However, we've heard reports from people who sprayed propiconazole at midday during the Texas summer with no problems.

Sulfur, oil, and Daconil are more likely to burn.

Thanks Michael,

I have been using Daconil--guess I will switch to Bayer.

Betty

Great info. I'm a newbie, can anyone confirm this is Black Spot on my Chrysler Imperial?

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Hi, Ben.

That's probably blackspot, but there are a few other dark-spot diseases.

Blackspot presents a slightly different appearance on different varieties of roses. The most typical spots have fringy edges and expand over a week or two to 1/4-1/2" diameter. Within another two weeks or so, the leaves turn yellow behind the spot and die. The disease first attacks leaves near the old canes and spreads upward if there is occasional rain followed by moderate overnight temperatures.

to be honest though, it is fungal, and despite which one of the fungi it is, it will respond to the same sprays.

thanks for the info guys(gals).At the suggestion of someone Iam gonna try to spray rose foliage every seven to 10 days with a solution of baking soda (one tablespoon each)and liquid soap dissolved in 4.5 litres (one gallon) of water. and for the bugs; a spray of equal parts water and three per cent hydrogen peroxide.I also uploaded a few pics if anyone wants to have a look and give me an opinion of my rose bushes.IT would be appreciated to see if anything they can suggest that I might be doing wrong.Here is the link

Here is a link that might be useful: roses

Lots of EX-baking soda sprayers on this forum. There is probably a reason why they no longer use baking soda, don't you think?

Kate

Baking soda works fantastic.....in the fridge. On roses, not so much.