Help on corn, canteloupe, cucumber

This is only my 2nd year of having a vegetable garden and I might have gotten a little overjealous with planting lots! Right now, sadly, I'm watching lots of stuff die.

Any ideas on what happened to my poor cucumber plants? They were doing great a few weeks ago and then slowly started to get spots on their leaves before the leaves turned brown, crisp and fell off. I'm started to see spots on the leaves of the cantaloupe which makes me worry it might be about to suffer the same fate.

My corn seems to have started having trouble around the same time. Everything looked great, I was starting to see ears of corn growing and then it all just stopped and now the plants are turning brownish and clearly dying.

It has gotten very warm earlier than usual here in 8b. Is it the heat? Am I watering too much? Is there some disease or pest that's causing this that I can treat for? Any help you can give would be wonderful!

More pictures at http://www.flickr.com/photos/ehrlinger/sets/72157624251069487/

Looks like downy mildew and/or powdery mildew. Do you water the garden from above, like a sprinkler or from a hose? Wetting the leaves every day makes it an ideal climate for the fungus problems!

I am just loaded with all kinds of fungus where I live. It will never be eradicated because it comes from the woods as well as the climate. (same thing with those @#$% slugs!) I have fungus on cukes, early blight on tomatoes, fungus on roses, peonies, and other ornamental plants etc. This is my second summer at this location. I have taken to spraying everything with a copper spray at least once a week, more often if it rains a lot. Last year I lost my entire cuke crop. It's not going to happen again!

I've got drip irrigation but it's hot, muggy Florida. There's no escape from the moisture in the air.

OK this maybe a long shot but do you see webbing on the plants? Do you have Spider Mites in your area? The mottled coloring and the dry crisp leaves look very much like SMs. They love cucumbers etc.. and they can take over a plant really fast. Just a thought

Oooo.. not only do we have spider mites in the area, we had a problem with them coming into our house last year. That definitely seems like a possibility.

I noticed the SMs were much worse when I went to the garden yesterday with my glasses on. LOL