Does anyone know what problem causes my cukes, pickles, and zucchinis to stop producing and the leaves turn yellow get a waxey and sticky film on the leaves.... This also happened to my cantaloupes and watermelons last year. Is there anything I need to do to the soil as I'm getting my beds ready for planting. We had tremendous output from these plants during the 2013 summer then almost overnight these plants wasted away due to whatever this problem is. Any help is muchly appreciated.