Yes, I know, certain bacteria and fungi can cause disease, both in animals and plants, and it is these detrimental aspects we normally think of first. But there are also many species of beneficial bacteria and fungi that we very much need and want to keep healthy. We have all seen the ads that tout the beneficial effects of bacteria (although the ads never use that word) in the proper functioning of our digestive systems. We all know that the ultimate source of everything we eat is plants, ...