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The beans are likely tough, stringy and bitter by now, here is some more information:
https://www.gardeningknowhow.com/edible/vegetables/beans/harvesting-beans-when-do-you-pick-beans.htm

Kentucky wonder is a good variety for zone 7. Not sure about your area

Well any pest on your veggies is not a good thing. Just to play it safe, I would treat the plant with neem oil, which is safe to use and should take care of any pest problem. It should also make it difficult for the eggs to adhere to the plant. Here is more information on it:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

With green beans, you would save some seeds for next year. This article will explain more about that:
http://www.seedsave.org/issi/904/beginner.html#anchor001

With strawberry plants, they are pretty hardy. Most people leave them in the ground or in their containers and they will come back year after year on their own. While you can make strawberries go dormant and store them for short periods as bare root plants, they do not survive more than a few weeks like this. The best way to "store" them is to leave them in the soil.

It sounds like they are succumbing to damping off. This is normally brought on by high humidity around the seedlings. Add a little fungicide to the soil as a starter. Try setting a fan on low to blow over the seedlings (if you are growing in the greenhouse). This will help improve air flow and reduce the standing humidity around the seedlings. If you are growing them in your garden, make sure you are watering in the early morning or late afternoon. This will allow the water near the surface to dry out more quickly and reduce the humidity around the plants.

If the plants were healthy all season, I would simply till them under the soil to help fertilize the soil for next planting season.