Please tell me it's not blight.1

[Bill HH]

These black spots are travelling through my entire crop. It doesn't look like the blight I had last year which were much bigger spots. What do you think?

[bearded bloke]

Could be magnesium deficiency Bill,try giving them a foliar feed.
Tablespoon of Epsom salts in a gallon of water & spray it onto the leaves.

Edit.I guess the plants are in containers ? are you feeding them ?

[WPG]

I've had very similar spots on my potatoes before Bill, and it didn't turn into blight. Like Bearded Bloke says, it looks more like magnesium deficiency.

[roitelet]

My thoughts too, a deficiency of something.

[Bill HH]

Yes they are in large 45 lt containers (potatoes I forgot to mention) They had some Vitax pellets and BFB when I planted them, nothing since. Going by the lush green growth I didn't think they needed anything else. I thought a deficiency of some sort but doesn't that just cause yellow leaves, not spots?

The other thing is it is going from one plant to another which indicated to me a disease.

[bearded bloke]

Excessive use of potassium-containing fertilisers is another cause. When potassium is present in high concentrations in the soil, it is absorbed in preference to magnesium.

Both taken from ... Tomatoes - magnesium deficiency - My Garden

[Bill HH]

Well I will try the Epsom salts tomorrow and see how it goes. I have some Sarpo Mire (blight resistant) and they don't seem affected. Yet.

[bearded bloke]

Here's a good reference page on nutrient deficiencies in plants .... Nutrient deficiencies/RHS Gardening

[WendyC]

Are there darks splodges on the stems. Does't look like blight which seems to start at the edges of leaves.

[Potstubsdustbins]

Looks like nutrient deficiency to me too. Bill I have found out over time that no matter what you start off with in the compost it's still dead at about 6 weeks.

I start with dried FYM and a hand full of pelleted potato fertiliser and still have to feed after week 6/7 dependent on whether we have had a lot of rain which will of course leech the compost anyway.

[Bill HH]

It certainly doesn't look like the blight I had last year, but I have seen pictures of blight that do look like this, could it be early blight, is that a different strain to late blight. I shall go the deficiency route unless it progress to horrible proportions.

[veggiechicken]

Please tell me it's not blight.

Its not blight - happy now?

Actually, I haven't a clue but you asked so nicely..................................

[Bill HH]

Please tell me it's not blight.

Its not blight - happy now?

Actually, I haven't a clue but you asked so nicely..................................

If it turns out to be blight you will be hearing from my solicitors, Messrs Diggit and Friggit.

[bearded bloke]

I presume the plants are outdoors ? if so first thing in the morning while the leaf still has surface dampness,look at the underside of the leaf,if it is blight there will be a white halo around each spot according to the good Dr. Hessayon

[veggiechicken]

If it turns out to be blight you will be hearing from my solicitors, Messrs Diggit and Friggit.

Ah Yes, the well known duo, performing twice-nightly at the Torquay Blightodrome.
They're a couple of tenors, or is that what it takes to bribe them..............