First time gardener here. I've got pole beans growing in a spot that is probably too shady (I've got a serious want of sunlight in my small yard) and they are dying off (pictures below). My tomatoes, about 20 feet away, may be having the same problem but seem to be fighting it off. I had a serious slug problem in the spring, which was easily taken care of with some SlugGo (iron phosphate) and aphids on my basil, mint, and a few other herbs, which was taken care of with daily aphid-picking. Since then, I haven't found any bugs feasting on them.
Any ideas what this could be and how to fix it?
Thanks for your help!