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Can you recommend some very healthy varieties ?
Most rugosas are(but not "Agnes")
Any suggestions?

Roses are as 'healthy' as you can keep them. Weather, aspect, soil, all pay their part. Also what you pay for is what you get. Good rose breeders produce relatively disease free plants.  When I plant a clients garden I will only use David Austen roses as they always seem to be trouble free, so it is worth looking up their internet site. But if you are going for the bargain basement 'rose in a bag' cheapies expect trouble, they are rejects before you even start.

Thank you Ace,but that doesn't answer my question.Some cvs have a natural resistance to diseases specially some old varieties.I know for instance a big rose bush in a neglected garden that is struggling against brambles and yet never has a spot of marsonia or oidium but plenty of pink roses.
I have also seen a gallica that is specially healthy..
Sometimes the owner agrees to offer a cutting but knowing them and buying them 'd be easier!

If you are going for old roses, there will be all sorts of diseases that will affect them. But as I tried to say earlier, Good rose breeders have hybridised most varieties to be disease free. Getting the best out of the traditional roses but still giving you a good show. Go for good hybrids you will not go wrong. The rose in the bramble must be a natural companion planting, where the bramble keeps the nasties at bay  or takes them itself.

Hi ,am not very good at growing roses ,but last year we decided to splash out on a David Austen rose, one of the old style with a lovely perfume ,there roses are not cheap,but I think they are the best , we are now so happy ,our rose is wonderful and healthy we put chicken pellets in-to the soil and liquid sheeps manure feed once a week a very week one all is well so far

I agree with ACE....getting your roses from nursery where they are looked after properly is good starting point but after that is down to nurture. Even the most resistant to 'this and that' will suffer if their growth is challenged.
Where ever I 've been gardening and where they've had roses..for some reason it is always been the white and yellow roses (hybrids) that have been most prone for problems and they've always needed that extra TLC for getting best out of them.
In my own garden I have number of David Austin roses..old English type roses..and they don't get any fancy treatments from me and they do very well indeed. I don't spray or give them artificial fertilizers as such..but they will have to cope with lashings of chicken poo (straight from the source  )..yard sweepings...old compost from pots...kitchen veg trimmings..etc. what ever gets chucked underneath and will all act as mulch and compost away.
If and when I find space yet another rose...it will come from Austin's ..either directly from the nursery or bought from nursery who supply their roses. I haven't had bad rose from them yet 

One of my happier and healthier roses... Mustead wood..

We have a "Jens Munk" rugosa which has no disease problems, reblooms and is positioned against our pond and gets spray blown on it but never gets black spot disease. 

The only negatives: thorns and no fragrance that I can detect.

Jens munk is said to have problems with oidium.
You are lucky or.....you have a secret !

Well, you made me look up "oidium" and taught me a new word while at it.

It is strange that our Jens Monk rose has no problem because our grapes, monarda and some other perennials are afflicted with various types of mildew especially this year since we've had rain a couple times a day for the last 2 weeks it seems.

My roses are mostly from cuttings, and they're quite healthy. It's at least as much the environment and the way they're grown as where they come form.

Quote from: John85 on July 04, 2013, 19:23:20
Jens munk is said to have problems with oidium.
You are lucky or.....you have a secret !

I just figured out how to download pictures after not having done it for a long while. In my gallery is a picture of our Jens Munk in bloom with some pink rhododendrum.