[adri123]

Fume!!! I grew some lettuce from one of those living lettuce packs you can buy in the supermarket.  They were getting to a decent size in the new greenhouse and just noticed today that they are covered in aphids....

Do I need to fumigate the greenhouse?

[JayG]

A sulphur candle will deal with the aphids but unfortunately will kill any plants too, including your lettuces.

[adri123]

Thx Jay.  I've sacrificed the lettuces and left them out in the snow.  There are some plants left in the GH though and I don't want the aphids if they can be avoided.  No sign yet so they might have ALL been on the lettuces.

One good thing...found a ladybird today and popped her in the GH.