In my 50 years of farming and plant management, I've never seen mold, fungus, or mildew growing on crop plant leaves.
When I water, it's always just after sunset. Though we have to be in a drought condition before I water anything.
I put my rain gauge in the garden and let the sprinkler fill it to 3" once a week, maybe ten days if the forecasters
call for any rain that doesn't develop. Is there areas in the U.S. where this is more prevalent that others??
I am assuming these are squash and cukes. Ours go through a similar stage as they begin the dying process. Ironically, it seems to happen faster during wet times than dry times. I believe some similar conditions are produced from pollutants in the air. Rainfall brings down a larger concentration of them.
The only thing I know of that will knock PM once it has started is Nova.
Your copper products and macozeb and chlorafalomil are all preventatives.
It is a systemic so handle with extreme care.
Probably will not be able to save the worst of those plants but should keep it from spreading.
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