[Ghost]

My lettuce seems to be constantly killed by the maggot. Had the problem last year and thought it might be a one off but it's happening again despite crop rotation.

Anyone else have problems with this pest?

Thanks

[mumofstig]

the flies lay their eggs on the neck of the lettuce where it comes through the soil - covering with fleece or enviromesh will stop them doing so.

I wonder if collars, the kind you put round brassicas would also work 

[Ghost]

Thanks.

Any idea if they're worse in certain months? I seem to remember my lettuces were fine May onwards.