mycotoxins, whats the risk

whats the story with mycotoxins and risk to health in a gardening sense. Does anyone know? Does a rust on a plant consumed giving you a dose of a carcinogen?

Generally not. You need to watch out for toxic molds that may be in your house or "off" compost (black molds are usually not a good sign, avoid breathing, can lead to aspergillosis). Rust on plants doesn't hurt people (as far as I know). Ergot on rye and some other species of related grasses can be a health hazard to people or animals grazing/eating contaminated seeds or hay.

Here's a site that has several links to info on mycotoxins: http://texasgrassfedbeef.com/science_underscores_grassfed_meats.htm
Alt-F and search for myco and you'll find the links. Bottom line is they're a big problem with big-ag grain products. But I don't eat many grains or feed them to my critters, so I'm not too concerned.