No Joy Indeed

In a post two weeks ago, I spoke about a field that we suspected to be infested with soybean cyst nematode.  I received the lab report yesterday from samples collected in this field.
Two different poor spots in the field were sampled.  The amount of cyst is reported in 100 gm of soil.

Poor sample #1        Soybean cyst   78
                                 Eggs          14820
Poor sample #2        Soybean cyst   86
                                 Eggs          17200

In the good areas of the field, the soybean cyst and egg numbers were not detectable.

The following chart from OMAFRA's Agronomy Guide outlines the risk level at various populations of eggs and soil types.
 

SCN Population #eggs per 100 grams of Soil	Risk Rating	Potential Yield loss	Rotation
0-500 coarse sand	low	0-20%	4 years
0-1000 Fine textured silt, clay	low	0-20%	4 years
1000 coarse sand	high	20 -50%	6 years
2000 fine textured silt clay	high	20 -50%	6 years
10,000 all soils	Resistant varieties may be damaged	----------	---------

You can see with levels of 14-17000 eggs per 100 gm of soil that our samples are extremely high.  This situation should not be taken lightly.  The field needs to be taken out of soybean production for a long time and when soybeans are grown again a cyst resistant variety will be absolutely necessary.
It certainly has served to be a wake up call that soybean cyst is in our backyard.  Joy!