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Understanding Soybean Cyst Nematode HG Types and Races

G. L. Tylka

June 2016


Confusion still exists about the concept of soybean cyst nematode (SCN), Heterodera glycines, race and HG type. Questions from researchers and agribusiness and extension professionals who advise farmers include: When will there be a molecular test for HG type (or SCN race)? How many HG types (or races) are there in a field? Do seed treatments work against all HG types (or races)? These seemingly logical questions of practical significance are unanswerable if one understands the concept of HG type and SCN race. This article draws a comparison between the current SCN HG type test and a hypothetical test for human food sensitivities that may provide a new perspective and make HG types more easily understood and used.


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