Root Knot Nematode Symptoms on Carrot

Root Knot Nematode (nematode - Meloidogyne spp.): There are no diagnostic symptoms seen on above-ground plant parts. When infected carrots are examinged, galls can be seen on adventitious roots and there is often multiple tap-root formation [Photo #5] or malformed roots. Although deformed carrots are culled at the packing shed, nematodes contained in the roots are not harmful to humans when consumed. A soil test for nematodes can be done before planting to determine the potential for a problem. Pre-plant nematicides can be used where the soil is infested. Nematode populations in soil can also be reduced with a weed-free fallow or by rotation with cereals.