cristina wrote:

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

I have added two closeups:

http://www.geocities.com/artyard/pia...alatclose1.jpg
http://www.geocities.com/artyard/pia...alatclose2.jpg