Just recently found this site and saw this thread today. As a Master Gardener and Georgia Certified Landscape Professional, may I say that I agree with several of the previous posts.
1. ALWAYS give as much information as possible and ask specific questions, i.e. what is causing the tips of my beans to die with a brown powder? There are so many variables in horticulture success.
2. That said, it seems that your biggest problem is soil moisture management. Try going to a local garden store and getting a moisture meter. They range from $10 to over $100. Just in case the directions are vague, as they sometimes can be, do a calibration test of sort as follows:
Take a pot of the garden soil and thoroughly saturate it. Then test it with your meter. This will show you what reading you will get for totally wet soil. I follow that up with a container of appropriately moist soil. That is, soil that will ball up when squeezed but will easily crumble and not stay in a mud ball. See what that reading is. Now you have two standards to go by and should be able to, from a practicle perspective, to gauge what you garden soil moisture level is. You may need better drainage, you may need better structure.
3. The suggestions for utilizing your local extension office are excellent advice. You do not have personal opinion but rather the benefit of information from a university. Just for asking, is that where you got your soil test done?
4. Fungus does not usually leave a powder (notwithstanding mushrooms, i.e. puffballs) and mold on plants is white.