[JayG]

just on a side note - did paraffin used to be a cheap product because no end of old plant treatments and insecticides seem to contain it!

It was definitely affordable in the 1950's!

Still sometimes count my fingers to make sure they are all there as our "pink paraffin man" used to deliver it using a horse and cart and us kids got to nervously feed his horse with a carrot!

Can assure you it was never used on the garden although it was a welcome heat source in a non-centrally heated house!

(In case you are wondering I am still under 60 (just!) and we're talking London suburbs rather than out in the sticks!) 

[plopleuk]

What time of the year do the flies disappear?
Just so I know how long the cover has to be over the carrots.

[Rampant_Weasel]

i think they come in may and then another generation in august, but someone said on here that they reckoned that with global warming they are about all the time now.

[gillie]

What time of the year do the flies disappear?
Just so I know how long the cover has to be over the carrots.

I don't think that they do disappear.  The snow removed my environmesh and I did not bother to put it back.  We have just lifted the last of the carrots and they are the only ones that have shown a bit of damage.