Distribution and Virulence Phenotypes of Heterodera glycines in Missouri.

@article{Niblack2003DistributionAV,
  title={Distribution and Virulence Phenotypes of Heterodera glycines in Missouri.},
  author={Terry L. Niblack and James Allen Wrather and Robert D Heinz and Patricia A. Donald},
  journal={Plant disease},
  year={2003},
  volume={87 8},
  pages={
          929-932
        }
}
The soybean cyst nematode, Heterodera glycines, is the most economically important pathogen of soybean in Missouri. Knowledge of the nematode's distribution and ability to adapt to resistant varieties is important for determining crop losses and establishing research priorities. No previous surveys of Missouri have provided reliable population density and phenotypic diversity data; therefore, we conducted a random survey to obtain both. Two samples from each of 200 fields were collected; 392… 

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TLDR
The data show that Heterodera glycines is widespread in Missouri, that most infested fields have population densities above the action threshold, and that there is considerable genetic diversity among H. glycines field populations.

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TLDR
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TLDR
Investigation of the effects of Heterodera glycines on soybean growth, development, and yield found that susceptible cultivars produced significantly lower yields than resistant cultivars, but the yield reductions were not accompanied by visually detectable symptoms.

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TLDR
Eleven additional races are described; this expands the total to 16 races, the maximum possible using the four prescribed differentials and a + or - rating for each.

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TLDR
Number of fields to be sampled within a region or state varied with the index chosen; with specific indices, however, a 10% change in mean index value could be detected with a sample of 50 to 100 fields.

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TLDR
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