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Brown discoloration beneath
the potato skin at the site of a RKN infection. |
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RKN-Resistant Crops and Nematode Management
Planting an RKN-resistant crop that can be harvested is a tactic
that would allow growers to reduce nematode levels while still producing
a marketable crop. The soybean cv. ‘Manokin’ (maturity
group late IV-S) has resistance to RKN. Annual cropping of ‘Manokin’
resulted in consistent reduction in RKN detected in soil assays
and less root galling (an indication of nematode damage) compared
to roots of susceptible soybean cultivars. Because root galling
is directly related to nematode reproduction, planting ‘Manokin’
or other RKN-resistant soybean cultivar should reduce RKN populations
and improve crop performance over time.
While use of RKN-resistant soybeans has potential, it is important
to choose cultivars that have maturity group ratings appropriate
for the geographic region where they will be used as a double crop.
In addition, ‘Manokin’ is susceptible to root-lesion
nematode and therefore cannot be used alone for management in fields
with a mixed species infestation of parasitic nematodes. Use of
soybean or vegetable crops that are RKN resistant offer an economically
attractive strategy for vegetable crop growers.
Field procedures
When grown as a double crop option, seed soybean cv. ‘Manokin’
at 175,000 seeds/acre following harvest of an early season vegetable
crop. Maturity of ‘Manokin’ requires that it be planted
no later than late June – early July if it is to be harvested
for grain. Soybean may be used as forage, if season length does
not allow grain harvest. Following harvest, a non-host (or poor
host) crop for parasitic nematodes such as oat or rapeseed can be
planted.
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