Nematode Management in Soybeans
www. ncagr. gov/ agronomi/ uyrnem. htm
Note Comment
2- 1 Soybean cyst nematode is present. Soybeans and snap beans are the only
host crops for this nematode that are commonly grown in North Carolina.
Crop rotation is useful in managing soybean cyst nematode:
year 1 nonhost crop
year 2 cyst- resistant soybean variety
year 3 nonhost crop
year 4 cyst- susceptible soybean variety.
Growing small grains in winter is not equivalent to growing a nonhost crop
for an entire year. If soybean cyst nematode populations are very high, grow
nonhost crops for at least two consecutive years. Three years is even better.
If high populations of cyst nematodes occur after a year of cyst- resistant
soybeans, see Note 2- 3 below.
2- 2 This sample indicates an infestation of soybean cyst nematode. Take another
sample from this field before planting soybeans or snap beans.
nema note 2
2- 3 This sample indicates a high population of soybean cyst nematodes on or following a cyst- resistant
variety. Therefore, currently available varieties with the same cyst- nematode resistance will probably
not be effective against this population. Choose a variety with different resistance. See comments on
managing nematodes on soybeans with resistant varieties following Note 2- 6 below.
If possible, follow soybeans with nonhost crops for two consecutive years. After nonhost rotation,
you can grow a susceptible soybean variety without significant damage. If only a one- year rotation is
possible, then planting a variety in maturity group V after June 15th may give acceptable yields.
' Hartwig,' ' Delsoy 5710,' ' Anand' and ' Fowler' are highly resistant to cyst nematodes but may not yield
as well as other resistant varieties. New varieties with resistance derived from ' CystX' may be available
also. Consider using the following rotation when fields have high cyst pressure and no other resistance
is available.
year 1 nonhost crop year 3 nonhost crop
year 2 highly resistant soybean variety year 4 cyst- susceptible soybean variety.
2- 4 This sample indicates the presence of root- knot nematodes. Plant a resistant soybean variety this year
to help manage the nematode and prevent it from becoming a problem for future crops.
2- 5 The information sheet did not indicate the variety of the previous soybean crop. If a cyst- resistant variety
was used, it was not effective. Follow the suggestions in Note 2- 3 above.
2- 6 The information sheet did not provide complete cropping history. The sample indicates the presence
of soybean cyst nematodes. If it has been two or more years since soybeans or snap beans were grown
in the field, then these nematodes are not likely to damage next year's soybean crop. However, if these
crops have been grown within the last two years, damage may be severe.
NCDA& CS
Agronomic Division
Nematode Assa y Section
physica l add ress
4300 Reedy Creek Road
Raleigh NC 27607- 6465
mailing add ress
1040 Mail Service Center
Raleigh NC 27699- 1040
Phone: 919- 733- 2655
Fax: 919- 733- 2837
Weimin Ye, Ph. D.
Nematologist
Colleen Huda k- Wise, Ph. D.
Division Director
Steve Troxler
Agriculture Commiss ioner