Plant Pathology and Microbiology
Journal or Book Title
Plant Health Progress
It has been more than 45 years since the race test was created to describe and differentiate the ability of populations of the soybean cyst nematode (SCN), Heterodera glycines, to reproduce on resistant soybean cultivars (Golden et al. 1970). Nearly 15 years have passed since the updated adaptation of the race test, the HG type test, was established (Niblack et al. 2002). Unfortunately, confusion still exists about the concept of SCN race and HG type. Questions from researchers and from 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. Following is a comparison drawn 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.
The American Phytopathological Society
Tylka, Gregory L., "Understanding Soybean Cyst Nematode HG Types and Races" (2016). Plant Pathology and Microbiology Publications. 201.