I took out a large climbing rose and replaced it with a shorter one in the exact same spot. It is midsummer now and there is a rose shoot coming out of the ground around 10 inches from the base of the new rose bush. Is this likely to be from the old rose, which I couldn't get all of the roots up from, or the new rose? I have tried ripping it out once but it wouldn't come and it has grown again in the same spot. Can I poison it or do I have to do something else to it?

Which are the two roses involved? Some roses are known to sucker liberally, others not.

The one I removed was Mme Alfred Carriere which I think was on Dr Huey. The other is Pat Austin also probably on Dr Huey.

sucker
sucker in front of pat Austin

Lola, are you still within the possibility of comparing your "sucker" leaves with the original Mme A.Carriere?. I looked at mine and your leaves still look like MAC to me. I don't have Dr.Huey here. They've stopped using it as rootstock years back, so I can't compare. There's the possibility that you were unable to remove MAC completely and its coming back. Could it have been an own root version of it?
Arturo

I suppose it could have been own root but it's uncommon here. I have other MACs to compare the leaves and buds to so I will wait for more growth to check it but if it seems to be MAC can I poison it and not harm Pat Austin?

Probably you don't need poison,Lola; that would be risky for the new rose,methinks. Besides, poisons should be avoided.
When I get a stubborn rootstock or some such, I've had success just by tearing out or cutting out as much as possible, then mulching it over with a thick layer of cardboard topped by organic matter. Once in a while, I check under the cardboard, and if the sucker is still trying to grow I pull it out again, and re-cover the area. Eventually it dies off.

If you planted deep enough to bury the graft, the grafted rose may have grown its own roots, and the sucker could have come from them. At this stage, the little sprout does not remind me of Dr Huey.

porkpal said:If you planted deep enough to bury the graft, the grafted rose may have grown its own roots, and the sucker could have come from them. At this stage, the little sprout does not remind me of Dr Huey.

, if I read correctly, Dr Huey is a variant of R.multiflora. My multiflora used for rootstock is quite different from the leaves you have shown us.

I also with bart in avoiding the use of say 'gliphosate' . It will definitely spread and kill everything around. Bart's method of keeping the sucker in the darkness seems just perfect to me!

Arturo

Or you could dig it up and put it in a pot to see whether it grows up to be something desirable.

porkpal said:Or you could dig it up and put it in a pot to see whether it grows up to be something desirable.

I fully . That is exactly what it was in the back of my mind.... but Lola seems determined to get rid of it so I simply kept quiet about that option.... ....my pot ghetto is oversized by now...all types of roses get into that category... perhaps she doesn't want something else to be added on her plate right now...options....
Arturo

Sorry it took so long to answer. I might get someone to put the shovel between the sucker and PA and see if it continues to grow. If it does I will get someone to pot it up for me. I am fresh out of hospital today and not allowed to do anything for at least 8 weeks. The garden will just have to take care of itself for a while. If the rose grows I will give it to my brother who is always willing to take any plant I don't want. Thanks for the advice everyone.

Get better quick, Lola. I like your plan.