There may be tunnelling or destruction of the extremity of the tap root only, or, if the root has thickened, tunnels similar to those caused by the second generation may occur. Another way to defend your carrots from attack is through nematodes. The more favorable the weather, the more pests settle on the green part of plants and juicy orange roots. A useful article HERE about carrot fly prevention, although no mention of nematodes. Generally, Carrot Fly will appear in 3 big … When does Carrot fly appear? It is also a good idea to plant when the fly is not active and avoid planting in April to … The carrot root fly is the main pest that attacks carrots—and one that gardeners need to be ready to go to battle with when harvesting carrots and other members of the umbelliferae (or apiaceae) family, which includes carrots as well as celery, dill, fennel, parsley, parsnip, and celeriac. WHAT IS A CARROT FLY? Unfortunately, when carrot pests attack the roots and leave the foliage, this tasty edible food is ruined. Harm. The main host plant is carrots but they also attack celery, celeriac, parsnips and parsley. Hi Allan, avoid growing carrots in the same place each year and rotate with another crop that is not a root crop. The carrot fly (Chamaepsila rosae) is a pest of gardens and farms, and mainly affects the crop of carrots, but can also attack parsnips, parsley and celery.It is a member of the family Psilidae (order Diptera). This suggests that you could get away with re-using the soil if you sow later carrots next year because any pupae should have hatched and flown away by, say late June (turning the soil over a couple of times in winter should also … Carrot root fly is the worst of these pests. Would raised beds reduce carrot fly or would i also need to put a higher mesh around my raised beds? My beds are about 8inches tall. 1. The carrot flies to the kitchen garden in search of food. Parsnips also suffer, as do other members of the same family such as parsley and celery.. Make sure any carrots infected with larvae are removed and disposed of. Previous generations give life to new individuals, active reproduction ensures good survival of the species. An adult carrot fly is a very small black fly which has been described as "a low flying miniature cruise missile". The fly is attracted to the Carrots by smell. If you do have terrible trouble with carrot fly, consider sticking to just spring sowing for a summer harvest. And be sure to rotate crops so that you grow your carrots in a different part of the plot each year. The nature of first-generation carrot rust fly injury depends upon the development of the plant at the time of the attack. Rust fly maggots cause particular harm to the roots. Bury carrots below the soil so that the fly cannot lay its eggs. 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