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Hmmm. Dusty white leaves--could be powdery mildew--a picture might help. Are your cukes getting plenty of water? Cukes are water hogs. Also, don't use nitrogen fertilizer on your cukes--like tomatoes, you will get a wonderful green jungle but very few cukes. I always amend my soil with lots of compost (homemade or composted cow manure works good) before I plant the seeds. You can side dress later with more if you think they need it.
It is powdery mildew! And, I water them on the ground, not leaves, they have tons of blooms, so maybe it's just a bit behind. What commercial fert. should I use?