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[NRaleighLiberal]

15. all great questions, my friend! see below

For tomato issues, this is a great website - http://vegetablemdonline.ppath.cornell.edu/DiagnosticKeys/TomKey.html - it is all about issues with the appearance of foliage, overall plant (wilt or lack thereof), and fruit.

As far as adding milk, it can't hurt - kind of an urban legend - deserves a small controlled study.

Marigolds could push nematode worms away, but they would go where there are no marigolds - best thing would be to plant a nematode infected bed completely with marigolds, which will improve it the following year.

blossom end rot is a pain, and due to the developing fruit lacking calcium during periods of uneven moisture availability - egg shells leech Ca only slowly - they can't hurt, but probably don't help all that much - to minimize BER, using drip irrigation, or mulching well and ensuring the plants don't dry to wilting in periods of high heat when they are setting fruit.

hope that helps!