"eddy" wrote in message ...
how real are these for us to worry about.
what are they ?

Don't get too worked up ;-)) Somebody been blinding you with 'science'?
Pathogens are everywhere, in soil, air, water - you name it - just a general term for any organism or substance that
makes something ill. They are normally only troublesome to a plant or animal that is in a susceptible state - like
malnutrition etc. Just don't worry 'til you get problems. Good soil management and plant nutrition will keep you mostly
OK just as healthy lifestyle and 3 square meals a day keeps you mostly OK.

Rod