I have found this to be the best method to root easily from cuttings. Check out Hartwoodroses.com to see a nearly fool-proof method for propagating roses from cuttings. You can use this method to root anything from cuttings.

I haven't done it myself yet, but recently I was told by another rosarian that he dips his prepared cuttings in a mild bleach solution being careful not to dip the business end and lets them briefly air dry before sticking them in the rooting hormone and then into the ground. I guess that would kill any lingering bacteria or mold spores on the cutting and reduce the chances for it's growth on the cutting while in those moist settings.
It kind of makes sense and I may try that the next time I do cuttings.
John

HI name Marcelina, author and writer and writer advanced gardening.

Have any one rooting roses cuttings using rain tower?

Anything could go wrong during the process of rose propagation.

Right temperature, water control, disease control and etc.

Selecting healthy woody stem with healthy buds are more likely grow root and less prune to turning the stem cuttings to black. Also disinfect tools you use during the process.

Use any rooting liquid rooting hormone to speed up the rooting.

Also dead head the roses and wait 3 days to bud then when there is bud emerging, it time to propagate. Hope this will help.

Can i spray fungicide on the rose cuttings to stop them from getting black from the top?