Distribution and Virulence Phenotypes of Heterodera glycines in Missouri.

  title={Distribution and Virulence Phenotypes of Heterodera glycines in Missouri.},
  author={T. Niblack and J. Wrather and R. Heinz and P. Donald},
  journal={Plant disease},
  volume={87 8},
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… Expand
Variability in Distribution and Virulence Phenotypes of Heterodera glycines in Missouri During 2005.
The soybean cyst nematode, Heterodera glycines, is a serious economic threat to soybean producers in Missouri and needs to be carefully monitored and used only in rotation with nonhost crops and soybean cultivars with resistance from other sources. Expand
Determination of Heterodera glycines Virulence Phenotypes Occurring in South Dakota.
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Resistance of Soybean Cultivars to Field Populations of Heterodera glycines in North Carolina.
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Shift in Virulence of Soybean Cyst Nematode is Associated with Use of Resistance from PI 88788
The soybean cyst nematode (SCN) is the most economically important pathogen of soybean in the United States. Most of the SCN-resistant cultivars being grown in this region have resistance derivedExpand
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This study suggests that more cultivars from resistance sources other than PI 88788 are urgently needed for effective management of the nematode in Minnesota and other regions in the world. Expand
Genetics of Cyst Nematode Resistance in Soybean PIs 467312 and 507354
The complex inheritance patterns determined for the two PIs are similar to the three and four gene models for other SCN resistance sources known to date, useful to soybean breeders who use these sources to develop SCN resistant cultivars. Expand
Cyst nematode resistance and seed yield of soybean lines derived from SS97-6946
New sources of resistance to the soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) would be useful for soybean [Glycine max (L.) Merr.] cultivar development. The objective of this study wasExpand
Accessions of Perennial Glycine Species With Resistance to Multiple Types of Soybean Cyst Nematode (Heterodera glycines).
It is confirmed that there are high levels of resistance to SCN among the perennial Glycine species, which represents an untapped resource for use in genetic studies and for improving resistance toSCN in soybean. Expand


Distribution, Density, and Diversity of Heterodera glycines in Missouri.
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. Expand
Regional Assessment of Soybean Brown Stem Rot, Phytophthora sojae, and Heterodera glycines Using Area-Frame Sampling: Prevalence and Effects of Tillage.
The prevalence of brown stem rot, H. glycines, and Phytophthora sojae in the north central United States was investigated during the fall of 1995 and 1996 and both the prevalence and population densities were consistently greater in tilled than in no-till fields in all states for which tillage information was available. Expand
Soybean yield losses due to Heterodera glycines in Iowa
Natural field infestations of Heterodera glycines race 3 in Boone (central Iowa) and Hancock (north central) counties were used to investigate the effect of the nematode on soybean growth and seedExpand
Soybean Cyst Nematode Reduces Soybean Yield Without Causing Obvious Aboveground Symptoms.
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. Expand
Complete Characterization of the Race Scheme for Heterodera glycines.
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. Expand
Sampling for regional monitoring of nematode communities in agricultural soils.
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. Expand
Soybean disease loss estimates for the United States from 1996 to 1998
Soybean disease loss estimates were compiled for the 1996 to 1998 harvested crops from all soybean-producing states in the United States based on field surveys, information from field workers and university extension staff, and research plot data. Expand