Leaf Yellowing (Zucchini, Cucumber, Corn, Beans)

We had a cool wet week and my garden is taken over by yellow leaves. I'm going to post some pictures of each plant type. Is this one disease? What is wrong?

I'll start with corn.

here is the zucchini

here is a cucumber shot

here is another shot of the cucumbers

here is cucumber shot 3

I would appriciate any help you can offer. I have never had so many major things go wrong, in my garden, at once. I'm feeling a little overwhelmed.

What does the new growth look like? I've had some yellowing on older leaves but the new growth looks fine. The plants are still producing.

Has it been too wet? Are the roots rotting?

The zucchini new leaves look fine and they are still producing. The cucumbers are another story, the outer leaves that get sun look better, but here is a general yellowing, there are small fruit, but they look like they may be rotting or drying up. The beans, if they hold on will have their primary picking this weekend. (Bush type) The corn the leaves are dying from the bottom up. Tops still look healthy - maybe a little less green.

We did have a rainy spell last week. I have been using miracle grow time release fertilizer. Some of the pictures online that show leaf yellowing indicate nutrient deficiency. But there may be more than one thing going on I think.

Is it possible that your soil was ok to begin with? Perhaps you are over-fertilizing, and the rain is speeding up the release of the nutrients.

Over fertilizing the corn, maybe. The others have not had fertilizer in weeks. I was using a time release fertilizer. (miricle gro) If so I am in trouble, cause after I posted this. I went out and got an organic fertilizer with 15 nutrients (3-6-6) and put it down on all the problem plants.

Man if the rain cause the time release to dissolve too quickly then I added more. What will this do if it is the problem?

Sorry for the long delay in response-
I'm not really sure if over or under fertilizing is the problem at all. I am a new gardener myself, and I was hoping that one of the long timers might have some advice on that one. How is the garden doing now?

Adding organic fertilizer and treating with copper seems to have helped the beans, zucchini and cucumbers. The corn on the other hand looks as if it going to die. The browning of leaves and yellow-green color of the remainder leads me to believe it is over-fertilization. I was using time release and I believe the rain dissolved most of it and gave the corn too much. In my haste to correct the possible deficiencies, I added more organic fertilizer and probably finished it off.

I think using the natural way is probably the best way, anyway, but it sure takes a long time to 'make' it. I have been experimenting with worm composting, and what little I have been able to get from them has had a wonderful effect on my plants, but it just takes so long to get more. I have also been doing regular compost 'piles', using bath tubs, and keeping it moist and turning it, but a whole tub takes a couple of months to break down to what I want, and then-two good planting rows, and I have used it up!

I found a secondary problem on the corn. After treating with copper, I found hundreds of eggs on the center shoot at the tops. I assume aphids since the ants were also plentiful there. I treated with a dawn soap and water solution. I'll try to get photos today and post. The corn contunes to yellow and look like its dying.