Are you planning on treating the tree or the rose? The spores will certainly be on any leaves that may drop around the rose. You should remove any fallen leaves and put a fresh coat of mulch around the rose after that.

I also have trees with anthracnose. I also have around 100 varieties of roses. Every single one is infected. Weather conditions were horrible this year. Even with no roses under the trees. A rain storm is more than capable of blowing those leaves around. One wet leaf contacts wet rose leaves and it starts. Then slowly progresses from rose to rose. This started a few years ago for me and this year has been close to a disastrous season for the roses. Even the normally immune Flower Girl has it.

I've been a no spray garden for quite some time. If our humidity is going to remain this high year (yes it will). I'll be rethinking some decisions that I've been committed to. These roses will not continue to live thru winter when they are defoliated for half the growing season.

Oops, just noticed I'm saying more than you asked so I'll stop here. I hope you come up with a solution.

Oh no! Not good news Patty as we're in similar climates (I'm in western PA.) my previous property had no anthracnose susceptible trees (we had a Kousa dogwood) We have four dogwoods and the big sycamore now and they are pretty heavily infected. The sycamore was more or less defoliated until August. So far my roses have been fine (just the usual black spot and rose worms) but you said it started slow and spread? Really hoping that doesn't happen.

Tried to ask a neighbor about it and she acted like I was speaking a different language.

Good to hear your roses are not infected yet. Even if they start to spot you should easily make it to winter without a problem. I only have 3 Austins and they were slow to catch any spots.

Plant diseases generally do not travel freely between different types of plants. Dogwood anthracnose - Discula destructiva - will not affect any plant outside of the Cornus genus. Sycamore anthracnose - Apiognomonia veneta - is a completely different pathogen and this tends not to cross genera, either.

Rose anthracnose is yet still another pathogen - Sphaceloma rosarum - and as the specific epithet would indicate, is specific only to roses.

Thats what I get for not looking it up. Thank you gardengirl for the information and nicely said I might add. Then mine was brought on by the horrible weather conditions that many of us had. It did not help that a few of my new roses came with it.

Does anyone know if it would help to place new comers in the garage. Then spray with a fungicide before placing in the garden.

Thank you gardengal. I assumed that it was all the same strain since more than one species of tree was affected. I had also heard someone on a different forum talk about hosta planted under an infected dogwood catching it from the tree above. Maybe not what was actually happening but both plants susceptible because of weather conditions?

Mine is now on my hydrangea and hosta. The only spot free rose is my good ole rugosa rose.