Posted: 24/06/2015 at 23:59
Ray, if you had carrot fly last year in that spot the carrot fly would have already been in the soil and hatched out under your fleece.
this year one lot of carrots was sown in same spot as last year and I used nematodes as well as fleece. The nematodes should, theoretically, break the cycle.
i would sow afresh and water on nematodes afterwards.