Before destroying the plant, and if you can't afford to virus test, I'd try
treating with an all purpose micronutrient. Roses respond in some rather
weird ways (and some predictable ones too) to lack of certain micronutrients
such as zinc, molybdomen, copper (or its overdose), and others. Buy a
fertilizer with a complete micronutrient additive and spray on the leaves as
well as drenching the roots. If 2 or 3 of these treatments doesn't cure the
problem, than it's probably fungal or viral. Treatments of Dithane and/or
Physan might help. If not, follow Iris's advice.
Gary

"cristina" wrote in message
...
Do anyone knows what kind of disease this is?

The younger leafs fall down on touching and they have this strange
design....

http://www.geocities.com/artyard/pia.../malattia1.jpg