from my understanding the only way to prevent is with treating the seeds with pesticides. I have heard of people freezing their seeds though to kill larvae, but that doesn't make sense to me, I thought the flys laid the eggs into the seedlings, I could be wrong on that. Also wet cold soil is a ideal condition for them. I would start new seeds in fresh soil and germinate them as fast as possible. I wouldn't soak them in water, just moisten some paper towels and lay the seeds between 2 layers and let them rest overnight, also try putting cheese cloth over the soil while they are germinating to try and keep the flys out of the dirt
9 Mar ’13
We have a similar pest here, 2 things in your favour if your not wanting to used pesticides. The adult flies may all have finished laying, its not an indefinite period. Start you crop of on fresh soil in containers,we use grow bags, and let them develop quite a bit In the meantime turn over the affected patch several times, this will exposed the hatched larval stage to birds and predatory insects. Then if you can add quite a layer of fresh compost and plant on. Of course , pull up destroy any already infected plants..
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