Distribution and Virulence Phenotypes of Heterodera glycines in Missouri.

  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},
  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… 

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.

Determination of Heterodera glycines Virulence Phenotypes Occurring in South Dakota.

HG types with ≥10% reproduction on indicator lines PI 88788, PI 209332, and PI 548317 were most prevalent in the soil samples tested, suggesting that the use of these sources of resistance for developing SCN resistant cultivars should be avoided.

Resistance of Soybean Cultivars to Field Populations of Heterodera glycines in North Carolina.

The initial inoculum level was negatively correlated with soybean seed yield, but cysts 28 days after planting proved to be better at predicting seed yield than Pi and Hartwig and Delsoy 5710 generally yielded more than susceptible cultivars or cultivars derived from other sources of resistance.

Characterization of soybean cyst nematode diversity in Kansas

Information about SCN diversity in Kansas will improve decisions regarding cultivar development and selection for SCN management and suggest that sources other than PI 88788 should be used in the development of H. glycines resistant cultivars for Kansas.

Characterization of the Virulence Phenotypes of Heterodera glycines in Minnesota.

There was no noticeable change of frequencies of virulence phenotypes in response to the use of resistant cultivars during 1997 to 2002 in Minnesota except that FI increased on the PI 209332.

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 derived

Estimation of virulence type and level of soybean cyst nematode field populations in response to resistant cultivars

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.

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.

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.

Correlation of Female Indices From Virulence Assays on Inbred Lines and Field Populations of Heterodera glycines.

To avoid further adaptation, rotation of cultivars with resistance from these groups should be carefully monitored, including those from the most promising source of resistance, PI 437654, such as CystX.



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.

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.

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 seed

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.

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.

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.

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.