The soybean cyst nematode scn heterodera glycines is a plant parasitic nematode and a devastating pest of the soybean glycine max worldwidethe nematode infects the roots of soybean and the female nematode eventually becomes a cystinfection causes various symptoms that may include chlorosis of the leaves and stems root necrosis loss in seed yield and suppression of root and shoot growth. Soybean cyst nematode scn heterodera glycines was first identified in ohio in 1981 and has now been found on soybean in 72 of the 88 ohio counties scn damages soybeans by feeding on roots robbing the plants of nutrients and providing wound sites for root rotting fungi to enter the severity of symptoms and yield losses are dependent on several factors including the number of nematodes . Figure 1 sugarbeet cyst nematode bcn and soybean cyst nematode scn survey 2012 2013 2 embedded while the rest of their bodies break out of the root white females become yellow as they age and then turn brown after they die the brown stage is the cyst for which the nematode is named each cyst can contain between. Soybean cyst nematode scn is one of the most significant pathogens of soybean in most places where soybean is grown it is widespread in minnesota and has continued to spread into new areas and counties yield loss from scn can exceed 30 percent soybean cyst nematodes are microscopic roundworms
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