The zucchini plants appear to have a white fungus on them. This can be conquered with the use of canola oil mixed with a small amount of dish washing liquid. Although, this usually happens late in the season to squash and pumpkins, this has been happening to our zucchini plants and will kill the leaves.
Here are more pictures of the garden adventure progress. Come on tomatoes! The yellow crookneck squash planted in the straw bales look great!