[alwayshopeful]

I bought a 6 x 4 plastic greenhouse this year and stuffed it full of tomatoes, cucumbers, melons and peppers.  Unfortunately went on holiday for a long weekend and came back to find all the tomatoes had blight (at least I think that is what it was - mouldy leaves, brown patches on stems and tomatoes) 

My question is this.  How do you manage a plastic greenhouse.  I was opening it during the day and closing it at night, but since the blight(?) problem am leaving the door open permanently for better air circulation and less humidity.  The thing is it is now quite bare in there with the tomatoes gone so with better air circulation, should I start closing the door during cooler weather (like today - I know its summer but we all know how that goes!!!)? 

[mumofstig]

With tomatoes/cues/peppers  inside my door stays open 24/7 at this time of year, I may half close it if it's a bit windy.

I only start fully closing it up at night towards the back end of summer, when the nights start getting really chilly again.

[DD.]

Sounds more like botrytis than blight.

[alwayshopeful]

Sounds more like botrytis than blight.

I did wonder about that, but either way, the plants were decimated and it spread sooooo quickly    Thought the best thing to do was destroy them completely and keep fingers crossed it does not appear on the other veg in there.

[Goosegirl]

A 6x4 greenhouse is more difficult to control the heat and humidity than a bigger one. If the toms you are growing can be grown outdoors also, I would leave the door open so thwe GH gives some protection but you have a better airflow. Get a thermometer and check your temps. Use your instinct - if it gets windy (ie - the direction is blowing into your GH) or the sun is well out or if it's dull. I think your problem is more to do with mildew rather than blight but someone else on here may disagree.

[Livinhope]

I've got the same greenhouse 6 x 4 and although my cues and toms are outside I do have other things in there and the door and window are open all the time at the moment.  Door about 4 inches window 2 just to keep the airflow going.

[alwayshopeful]

I don't hae a window on mine  .    If it was mildew, would it not appear on the other plants?  The toms were the only thing affected.  Did spray with Bordeaux Mixture as thought it was leaf mould, but it did not help.  fortunately am growing toms outside so at least it is not a total loss (shouldn't speak too soon, usually a death sentence in my garden  )

[tosca100]

I've got a plastic lean-to greenhouse which doesn't get sun all day. I leave the door open all the time unless it gives strong wind (the panels blew away once, it now has more clips holding them in than the garden centre has in stock) and it has an automatic window thingy. I'm very pleased with my little greenhouse, the only problem is space, second year.