Thursday, July 10, 2014

Time to look for soybean cyst nematode

Visual symptoms of soybean cyst nematode (SCN) are showing in soybeans:



Not all fields will have this degree of chlorosis and stunting (above picture), this is a severely infested farm and a non-resistant soybean.  More often symptoms are much more subtle.  In the picture below the farm is moderately infested with SCN (manageable levels) on the left is non-resistant soybean and on the right is a resistant soybean. Notice the slight differences in growth.

These above ground symptoms are not always the most visible, so it a good time to check roots for the presence of females (picture below).  The nematodes will be much smaller than the root nodules and may require the use of a hand less or reading glasses for some people. The picture below is of a RESISTANT soybean, notice you can still observe females at low levels on this plant.

More on SCN management:http://www.extension.umn.edu/agriculture/soybean/soybean-cyst-nematode/



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