Pink spotting is no big deal, but petal blight fungi can cause balling and rotting of flowers. Botrytis probably has little to do with stress. The fungus is everywhere and it germinates in cool weather with some rain. It ruins a significant fraction of my rose flowers every season. I discard varieties that are overly susceptible. There is not much that can (conveniently) be done about it. In some circumstances it causes canker and cane loss, but it will not kill your roses.

A different fungus that can cause pink spotting in warm wet weather is alternaria. Copper sprays can also cause spotting of white and light pink roses.

Although copper is safe for animals once it has dried, I would not suggest spraying copper for petal blight. Blackspot is a more serious issue if you live in the Midwest or, especially, the East.

The nursery is correct that you should bury the grafts when planting in zone 7a and colder.

Michael, thank you for the crash course,
I must say , as a gardener, I have had a very steep learning curve this past 2 weeks.
Soo glad to hear this is not lethal to the plant, I did break a few of the canes when sinking them, I did not take any further precaution than to snip them off and make a clean cut.

Do you have any suggestions on a what I should have in my rose arsenal?
I'm not too fond of heavy chemicals but am resigned to having to step it up to keep the roses healthy.
Thank you, K

Insecticides are rarely if ever needed. Scout for chewing insects and remove them. Bring your pest control questions here.

Fungus diseases very with the climate. When you bring questions here, you should name your state in your sig line or in the post.

In the east, and to a lesser extent in the midwest, blackspot fungus can defoliate most rose varieties repeatedly during the season. This can cause less hardy varieties to die over winter if subzero conditions occur. Some varieties are resistant (ask here) while others are hardy enough to survive without fungicide anyway, though the foliage may not look so good.

Living in an area with extreme disease pressure, I use Bayer Disease Control for Roses. . . (containing only tebuconazole) about every two weeks, to control blackspot and other fungi. It is available at some Lowe's and online. If you want to avoid synthetic fungicides, copper soap (Soap Shield) is probably the most effective option. Sulfur sprays may be adequate if you apply often enough.

Do not buy combo pesticide products (3-in-1 etc.).