Fungicides, specifically copper + maneb (Mancozeb) applied at label rates. Research Mancozeb before deciding whether to use it or not.

Assuming pathogen free seed then it usually overly wet foliage with little chance to dry out that triggers it and who hasn't had overly wet foliage so far this year.

Dave

According to VA Tech, Fanfare should give you some resistance. Maybe if you grow all resistant varieties you can reduce the bacterial inoculum over time. Covering the ground with a paper or film mulch that prevents mud splashing might help, too.

Here is a link that might be useful: ALS resistant cukes

Since I pulled out the infected plants should I consider an alternative organic preventative for the remaining healthy plants instead (like the baking soda or milk solution options)?

Planatus, thanks for that link. That list will help me plan for next year.

Baking soda and milk have never shown any beneficial result in scientific testing. They are both considered anecdotal treatments at best. So using them is your choice.

However there are a number organic controls available in the form of copper fungicides. And they have been proven to be effective as a control for several of the fungus/bacteria caused diseases. The only preventative effect any fungicide has is if applied from day 1 of plant out. Once the fungus or bacteria has a hold on the plant then even the strongest fungicides become controls, not preventatives.

Dave