Blight on Tomatoes

Just noticed this evening a few of my tomato leaves have blight, dark brown blotches, underneath the leaves there are visible white edges to the brown blotches. This is in my greenhouse.

I've never had blight before in the greenhouse. I cut off any leaves showing the slightest sign, and also trimmed off all the lower leaves below the first truss. I'm going to burn all the leaves tomorrow. I'm leaving the greenhouse door a bit ajar to get it well ventitlated (or maybe I should shut it to prevent any more blowing in :confused

Googling says to prevent it spreading use either:
Mancozeb (Dithane) or
Bordeaux mixture (copper oxychloride )

I dashed off to B&Q then Homebase but neither has anything like this.

My question is where to buy the stufff? I guess a larger Garden Centre, we are not very well served with them around Guildford, so if anyone can suggest a specific chain that would help e.g. Nottcutts or Squires (they are each about 10 miles away in opposite directions)

 

Yeah will do kristen:

Am I wasting my time trying to save the tomatoes do you think?

 

Thanks kristen: I went into panic mode straight away and turned to google, then I saw the Veg & Herb Expert on the desk right next to me!, it is much clearer than anything on the web.

It hasn't got into the fruit as far as I can see so I am hoping I have caught it in time.

I stripped all the infected leaves off last night, and this morning they look a sorry sight, some of the plants have just the top growth and a few leaves on the main stem.

Ah well, I guess its not going to be my year for tomatoes :(

I am now turning to my third batch! I took some side-shoot cuttings a few weeks ago just as an experiment to see how they reacted to my contaminated compost. I haven't put them into the contaminated compost yet, so just now I potted them up in good stuff - they are only about 12" high.

Strangely my neighbour has outdoor tomatoes right next to my fence, they are only a few yards away from my greenhouse. His toms show no sign of blight so I just don't know how I got it and it missed his. I wonder if it could have been in my dodgy compost? :eek:

 

Next doors tomatoes might be the only home grown ones I get this year :(

Blimey I didn't go that extreme! I hope no-one follows his advice - sounds like bulls**t to me

Thanks for the info pete :thumb: yes I was thinking it needs to be better ventilated.

 

freddy: I got Bordeaux Mixture which I think is OK with the green brigade.

I looked at Dithane; it contains mancozeb; so I think it may be the same thing. I haven't researched the 'greeness' of mancozeb, what do they say is the problem with it?

 

I'm thinking now that I got blight from my watering system - I catch rainwater from a shed and use that in the greenhouse, that might explain why my neighbour with his outdoor toms has not got it (he uses tap water).

Took some photos of the toms after I pruned and sprayed them, remember I started these plants very late so I haven't yet had any fruit ripen :(

This was last night, the spray has had a good effect on the few brown spots I did not prune off, the brown spots are now dry and no longer showing the white mouldy outline.

 

They are normal pots with large 1" sized holes in the bottom. I've never used pots before, this batch is in pots to stop the roots getting into the dodgy compost in the rest of the soil. I am hoping the roots will just go straight down (I scooped out all the soil underneath each pot and replaced it with the contents of growbags). Putting them lower down should also give a little bit more growing space.