[erainn]

Noticed on the base of some tomatoes I am growing, a dark grey/black area. I am crosing my fingers this is not signifying blight If so is there any meaningful/effective action I can take, or is it a case of surrendering to nature?

[arugula]

Photos would be helpful...

[hamstergbert]

if you refer to the bottom of the tomato fruit rather than the plant then the problem is probably blossom end rot caused by calcium deficiency due to irregular watering.  Best to ditch those fruits affected and take charge of the watering for the rest of the season which should prevent any more suffering the problem.

[arugula]

Or it could be botrytis or canker, which is why photos will help us to help with a diagnosis.

[erainn]

Here tis

[Lardman]

Looks like blossom end rot to me.

[mumofstig]

blossom end rot it is!

More regular watering is required erainn

[erainn]

Thanks for the ID and advice,a special to my adopted 'mumofstig' too