Question
can you please help me/

I have a huge climbing rose that last year I needed to prune back at least one
third because of brown spots on leaves.
I thought is was because it was so wet- but here is it again hot dry weather
and they are starting to come again mostly near the bottom

the bottom is very open with lots of air circulation but I do have a grape vine
right next to it and someone said that there is a fungus that grapes carry that
migh tbe affecting it.

can you help me?  It is an amazing repeat blooming fragrant rose growing
about 8- 10 feet high and i want to keep

Answer
The fungus on the grape vine only for grapes and the fungus on a rose only effects roses. The brown spots on the leaves is a rose fungus called Black Spot which attacks the rose leaves when the conditions are perfect such as wet weather for too long a time. The spots start out yellow, then go brown and finally a dark brown. There is no need to cut the rose back as any rose spray for Black Spot will cure your problem. It will also help the grape fungus too if it gets any. Always be careful of pruning climbers back too hard as some really resent it and you could have some die back on the main canes. I think you will find the rose fungicide will solve your problem. I wish there was an organic solution but none of them really work. Hope this helps.