How certain are you of the mosaic virus identification? I ask that because I have had trouble with cucumber diseases, but not that one so far as I know. I think my cucs have suffered from bacterial wilt and angular leaf spot. I'm not completely certain however.

Jim

Even if it is the virus, no carry-over from last year. Instead, it's aphids which infect plants during the current year.

Time ago i posted pictures of my cukes leaves to some forum and people told me that this is CMV. Maybe it's angular leaf spot. Not sure.
But i am looking to a way to prevent this problem.

How to prevent it all depends on what "it" is. If it is CMV then the best prevention is preventing/controlling aphid infestations each year. That means close plant monitoring, avoiding the use of excessive nitrogen fertilizers that attract the aphids, the use of some form of aphid pesticide - several are available, both organic and chemical, or using plant protection covers when necessary.

If it is one of the other problems that affect cukes - especially one of the breeze-born fungi - then prevention becomes a bit more complex but still doable.

The best first step is to learn about each of the common diseases that affect cukes and the prevention of each and then go from there.

The info site linked below is great - photos, good symptom descriptions, and both general and specific prevention techniques. There are several other good info sources too - just Google 'common cucumber diseases'.

Dave

Here is a link that might be useful: Common Cucumber Diseases