black spots on my tomato leaves

[veggiegrower]

Hi,
I wonder if somebody can provide me with some advise as to what is the problem with my tomatoes. I went away for 5 days and when we returned some of our tomato plants leaves have turned yellow and have brown specled marks on them (Bottom leaves effected worse then top leaves). It seems to have effected the plants closest to the door effecting Inca variety the worst. The plants at the furthest end do not seem to have been effected so far.

As far as I know the neighbour opened and closed the greenhouse each day and it looks as though the plants have been watered.

Could this be due to magnesium deffiency?

Shirley is our main crop (7 plants) and 1 each of Inca and Roma. They are being fed once a week with Tomorite The shirley have up to 3 or 4 trusses with fruit on the first two. I live near Southend and the tomatoes are growing in tubs.
Thanks
Stuart

[Lesley Jay]

Hi Stuart and welcome! It certainly looks like magnesium deficiency. I would give the affected plants a foliar spray with the epsom salts mixed with water treatment that I suggested to Martin. The plants usually 'pick up' pretty quickly after treating.

[alvin]

Most probably a type of fungus. Just Spray with Daconil...Good Luck!!!