Strips may comprise one or several rows of vegetables. Contact your county Cooperative Extension agent for Plant Pathology Note 6, which lists nematode-resistant vegetable varieties. Table 2 indicates the amount of marigold seeds or plants needed based on area. Use a marigold variety known to be Tagetes erecta or T. patula . Fertilize according to soil test recommendations.
Nutrient imbalances can make nematode problems worse.
Early in the growing season, cultivate between marigolds regularly to keep weeds under control. Before the first frost, remove as many seed-bearing flower heads as possible. Then, you will have seed for next year's marigold patches, and fewer volunteer marigolds will sprout among your vegetables. In the fall before crop residue destruction, take another soil sample for nematode assay from the marigold area, if you want to monitor effectiveness. Till the remaining marigolds into the soil.