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The influence of various crop rotations on population densities of  Meloidogyne hapla , the northern root-knot nematode, and subsequent carrot yields was studied in organic soil under field conditions. Seven 3-year sequences with barley ( Hordeum vulgare  L.), carrot ( Daucus carota  L.), onion ( Allium cepa  L.), or weedy fallow, all with carrot as the third-year crop, were replicated six times in a completely randomized block design. Carrot monoculture, two seasons of weedy fallow, or carrot followed by onion resulted in high  M. hapla  population densities and severe root damage on carrot the third year. Barley followed by onion or onion followed by barley harbored low  M. hapla  population densities and provided the highest yields, with 56.8 and 47.2 t marketable carrots/ha, respectively, compared to 2.2 t·ha –1  in the carrot monoculture. A single crop of barley reduced nematode population densities and provided 88% and 73% marketable carrot roots in the subsequent years. High  M. hapla  population densities and the high proportion of culls recorded in plots in weed fallow emphasize the importance of an effective weed management program for successfully using crop rotation against root-knot nematode in muck-grown carrot.

Using Crop Rotation to Control Meloidogyne hapla Chitwood and Improve Marketable Carrot Yield