Each plant type looks a little different when infected. Some get a yellow spot with a halo, some start out as a mere lesion. Some are black, brown, purple, or red with noticeable borders. In humid conditions, the spots/lesions become covered in hairy fungus. Plants can wither and take on scorch-like characteristics.
It's a good idea to inspect crops during winter months for any signs of disease. This is for plants who withstand temperatures and live year round. For annuals, you won't be able to detect until it's too late.
Organic fungicides may stop the spread, but it won't make it go away. Try to water at ground level not at leaf level. Spray leaves in a bath of 1 cup milk per gallon of water a couple times a week. If you have a huge yard, that's alot of milk, so a topical fungicide would work better. Milk for some reason controls fungus of many types. Try it and let me know if it works or not.
This is just one type of spot:
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