Are your cuttings growing under fluorescent light? Cuttings need light energy to produce roots.
Are your cuttings in a cool (50-60 deg F) environment? Cool temps reduce problems with fugii and diseases.

Also: cuttings require a medium which has good drainage and aeration; a mixture of 4 parts perlite plus 1 part peat works well.

Yes, how wet is the planting medium?

BTW, the roses that are sold by florists are primarily in the hybrid tea class, and there are quite a few that are grown outdoors by home growers.

These cuttings are growing next to a south-facing window at roughly room temperature. Early on, however -- maybe for the first week -- I did not place them in direct sunlight, since I did not want them to wilt for lack of roots.

The soil is light with sufficient drainage.

To note, the plants are now well rooted; I can see the roots through the sides of their transparent containers. At the same time, the yellowing seems to have ceased to spread for the most part, so perhaps this means it initially resulted from a nutrient deficiency.

However, I still wonder whether the lack of nutrients directly caused chlorosis, or whether the deficiency made the plants more susceptible to a disease which in turn brought about the yellowing.

Diane, thank you for enlightening me on the nomenclature.

It is not at all unusual for rose cuttings to lose their original leaves, just like the rose bushes themselves lose their leaves in the fall. If they are actively growing roots, it won't be long until you have new leaves.

I root roses in clear containers, too. It's a great way to see if roots are forming. From my experience, get the cuttings out of the clear pot as soon as you can once they're rooted. You'll grow a better root system in a nice, dark pot.

Connie