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Nematode Management Strategies
often do not sufficiently control plant-parasitic nematodes
enough to keep their population densities below damage
threshold levels. Some manufacturers market products as
biological nematicides. See Nematicide Table.
Physical Controls
Physical nematode control options include using heat, steam,
or water (flooding) to reduce nematode population densities.
In field situations, these types of controls are often not
feasible in the Midwest. However, in glasshouse or polyhouse
production, growers may use heat or steam to sterilize
growing media.
Sampling Nematode Populations
Plant-parasitic nematodes are microscopic organisms with
aggregate (often highly clumped) distributions in fields. As a
result, the symptoms their feeding causes often occur in
circular or elliptical patterns. If you observe plant symptoms
are uniformly distributed, the cause of the problem is
typically not nematodes.
All sound nematode management programs include rigorous
sampling. Since nematodes are microscopic and typically do
not always produce noticeable symptoms that indicate their
presence, it is necessary to sample to detect nematodes and
avoid problems.
A great deal of research has gone into sampling nematode
populations. Here are three important points:
1. Due to their microscopic nature, the only way to
diagnosis a plant-parasitic nematode problem is to
collect a soil and/or plant tissue sample(s) and send it to
a nematode diagnostic lab for analysis (see State Contact
Information table). It is critical to properly identify the
nematode's genus or species to provide specific
management recommendations. Please refer to any
bulletin or other publication devoted to sampling for
these organisms for more detailed instructions.
2. When collecting soil samples for plant-parasitic
nematodes, the more soil cores you can gather, the better
the sample. Collecting roughly 20 soil cores is usually
adequate. You can combine and mix these
3. cores. A lab usually only requires you to submit a pint to
a quart of soil. You should place nematode samples in
plastic bags and close them to retain moisture. Keep the
samples out of the sun and heat to ensure that nematodes
arrive in good condition for identification at the
diagnostic lab.
4. Use different methods for different sample areas. It may
be a good idea to separate different areas of the field
when sampling. For example, high or low areas of the
field or changes in soil types may require different
samples.
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