Host: Joanna Coles, Warren County Extension Agent for Agriculture & Natural Resources
Guest: Dr. Rachel Rudolph, UK Extension Vegetable Specialist
Topic: Management of Root Knot Nematode
Rotating with a non-host or resistant crop is the most effective method for reducing RKN populations. Although RKN has a wide host range, there are resistant or non-host vegetable cultivars that can be used in crop rotations alone or in combination. In order to break the cycle of RKN, host plants (crops, cover crops, and weeds) must be eliminated for at least 2 to 3 consecutive years to provide reliable control of RKN. Non-host crop species that RKN do not infect or feed on lead to reduced reproduction and an eventual reduction in the overall RKN population. Asparagus, sweet corn, onions, and garlic are non-hosts for RKN, with some exceptions. Many grains, including sorghum, are also non-hosts. Cover crops such as sunn hemp, partridge pea, and cereal rye are non-hosts for RKN, as well as various cultivars of cowpea. Contact a county Extension agent for more information on RKN identification and diagnosis.
The resistance and host status of some crops can vary among cultivars. Refer to cultivar descriptions when selecting vegetables for crop rotation. Some RKN- resistant cultivars of snap bean, lima bean, sweet potato, English pea, southern pea, broccoli, and tomato are commercially available and can be incorporated into a rotational system. It is important to know which species of RKN is present, as genetic resistance is typically targeted only toward the southern root-knot nematode (M. incognita) and may have no impact on the northern root-knot nematode (M. hapla). Resistance may be broken if soil temperatures are high.Resistant rootstocks are another option for introducing resistance into crop rotations. There are many cultivars of tomato rootstock that are resistant to RKN. Tomato cultivars grafted onto resistant rootstocks are available from some transplant producers and can be a viable option for sites with heavy RKN infestations. In trials performed in Kentucky high tunnels, certain rootstocks performed well and were not affected by RKN. Rootstock resistance to RKN may also be broken if soil temperatures are high. Other methods include weed management, early planting, sanitation, chemicals, biological control, and solarization. Follow this source link to our Root Knot Nematode Publication for more detailed information: plantpathology...
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