Marrow Stem Rot

I seem to be getting diseases on everything this year. Just when I thought something (my big marrow) was doing OK, I noticed this when administering it's dose of super feed:



And, despite being rather late (like everything else) it was looking so promising:

 

Oh, what a shame. The only thing now is to invite all your friends round to eat a giant stuffed marrow.

 

Bother Scrunge, not another one. You'll have the Ministry round.

 

Blimey Scrungee that's a big un....ha and i was fussy with my diddy one....Amazing....
Will it still be ok though...pumpkin stems split and seem to battle on....(forgive my ignorance)

 

But's that's where I hide my trays containing blue pellets of death, under cover from rain. No sign of any damage until the stem started withering and dripping goo. I'm amazed enough nourishment is getting through to prevent the leaves from wilting. Hope it's not catching.

 

A second marrow plant now has a rotting mainstem oozing gloop: