Effects of Continuous Culture of Resistant Soybean Cultivars on Soybean Cyst Nematode Reproduction

Plant Disease ◽  
1984 ◽  
Vol 68 (1) ◽  
pp. 237 ◽  
Author(s):  
L. D. Young
Keyword(s):  
Continuous Culture ◽  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
Nematode Reproduction ◽  
Soybean Cultivars

Effect of Soybean Cultivars Moderately Resistant to Soybean Cyst Nematode on SCN Populations and Yield

2008 ◽  
Vol 9 (1) ◽  
pp. 14 ◽  
Author(s):  
Eric A. Adee ◽  
Martin L. Johnson ◽  
Terry L. Niblack
Keyword(s):  
Soybean Cyst Nematode ◽  
Yield Loss ◽  
Cyst Nematode ◽  
Yield Potential ◽  
High Yield ◽  
Nematode Reproduction ◽  
Resistant Cultivars ◽  
Soybean Cultivars ◽  
Moderate Resistance ◽  
Moderately Resistant

Spread of soybean cyst nematode Heterodera glycines (SCN) to much of the soybean (Glycine max) growing region in the Midwest has created a persistent and significant annual yield loss for soybean. Host resistance has been the primary means of reducing yield loss to SCN. It is not known how moderately resistant cultivars fit into the management of SCN. Moderately resistant cultivars can have high yield potential, but nematode reproduction is greater than on resistant cultivars. Moderate resistance is defined by a SCN female index (FI) of 10 to 29 in standardized tests, whereas cultivars with an FI < 10 are considered resistant. Two each of SCN-resistant, moderately resistant, and susceptible (FI > 60) cultivars were planted in the same plots for two soybean crops in annual rotation with corn. The SCN population was reduced 80 and 54% by resistant and moderately resistant cultivars, respectively, and increased 189% by the susceptible. Yields of the resistant and moderately resistant were 8.2 and 11.8 bu/acre better, respectively, than for the susceptible. All plots were planted to a susceptible cultivar in the final year of the study, and demonstrated there was a carry-over effect from previous cultivars. Following resistant and moderately resistant cultivars, yields of the susceptible were 6.6 and 4.3 bu/acre above following susceptible cultivars. This study showed that moderately resistant soybean cultivars can be an effective tool for improving profitability of soybean. Accepted for publication 9 April 2008. Published 18 June 2008.

Selecting Soybean Cultivars for Dual Resistance to Soybean Cyst Nematode and Sudden Death Syndrome Using Two DNA Markers

Crop Science ◽  
1999 ◽  
Vol 39 (4) ◽  
pp. 982-987 ◽  
Author(s):  
R. R. Prabhu ◽  
V. N. Njiti ◽  
B. Bell‐Johnson ◽  
J. E. Johnson ◽  
M. E. Schmidt ◽  
...  
Keyword(s):  
Sudden Death ◽  
Dna Markers ◽  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
Sudden Death Syndrome ◽  
Soybean Cultivars

scholarly journals Increase in Soybean Cyst Nematode Virulence and Reproduction on Resistant Soybean Varieties in Iowa From 2001 to 2015 and the Effects on Soybean Yields

2017 ◽  
Vol 18 (3) ◽  
pp. 146-155 ◽  
Author(s):  
Michael T. McCarville ◽  
Christopher C. Marett ◽  
Mark P. Mullaney ◽  
Gregory D. Gebhart ◽  
Gregory L. Tylka
Keyword(s):  
Soybean Cyst Nematode ◽  
Field Experiments ◽  
Yield Loss ◽  
Plant Introduction ◽  
Cyst Nematode ◽  
Population Densities ◽  
Sources Of Resistance ◽  
Nematode Reproduction ◽  
Soybean Yield ◽  
Pi 88788

Management of the soybean cyst nematode (SCN) relies heavily on use of SCN-resistant soybean varieties to limit nematode reproduction and minimize yield loss. For Iowa, almost all SCN-resistant soybean varieties contain SCN resistance genes from a breeding line named Plant Introduction (PI) 88788. Iowa State University conducts experiments to evaluate numerous SCN-resistant and three to four SCN-susceptible soybean varieties in up to nine field experiments across Iowa each year. Data on SCN population density, virulence (SCN race and HG type), soybean yield, precipitation, and growing degree days from more than 25,000 four-row plots in field experiments conducted from 2001 to 2015 were analyzed to determine how these factors affected SCN reproduction and yield. SCN population densities were positively correlated with temperatures and negatively associated with precipitation during the growing seasons, indicating that SCN reproduction was greatest in hot, dry years. Over the years, virulence of SCN populations on PI 88788 increased in the fields in which the experiments were conducted, resulting in increased end-of-season SCN population densities and reduced yields of SCN-resistant soybean varieties with the PI 88788 source of resistance. These results indicate that soybean yield loss caused by SCN on resistant varieties with the common PI 88788 source of resistance likely will increase as virulence of SCN populations increases unless new sources of resistance become widely available and used in the future.

scholarly journals Variability in Distribution and Virulence Phenotypes of Heterodera glycines in Missouri During 2005

Plant Disease ◽  
2007 ◽  
Vol 91 (11) ◽  
pp. 1473-1476 ◽  
Author(s):  
Melissa G. Mitchum ◽  
J. Allen Wrather ◽  
Robert D. Heinz ◽  
J. Grover Shannon ◽  
Gene Danekas
Keyword(s):  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
Cyst Nematode ◽  
Common Source ◽  
Sources Of Resistance ◽  
Resistant Cultivars ◽  
Soybean Cultivars ◽  
Geographical Regions ◽  
Two Samples ◽  
Pi 88788

The soybean cyst nematode, Heterodera glycines, is a serious economic threat to soybean producers in Missouri. Periodic monitoring for the presence, population densities, and virulence phenotypes of H. glycines is essential for determining crop losses and devising management strategies implementing the use of resistant cultivars. A survey using area-frame sampling was conducted to determine the distribution and virulence phenotypes of H. glycines in Missouri during 2005. Two samples from each of 125 fields representing eight geographical regions of Missouri were collected; 243 samples were processed for extraction of cysts and eggs. In all, 49% of samples had detectable cyst nematode populations, which ranged from 138 to 85,250 eggs per 250 cm3 of soil. Race and H. glycines type tests were conducted on populations from 45 samples. Nearly 80% of the populations that were tested, irrespective of the region, were virulent on the indicator line plant introduction (PI) 88788, which is the source of resistance for most H. glycines-resistant cultivars. More than 70% of populations could reproduce on the indicator lines PI 88788, PI 209332, and PI 548316 (Cloud), indicating that soybean cultivars with resistance derived from these sources need to be carefully monitored and used only in rotation with nonhost crops and soybean cultivars with resistance from other sources. Approximately one-third of the populations, primarily in the southern regions of Missouri, could reproduce on PI 548402 (Peking), another common source of resistance. Fewer than 10% of the populations could reproduce on PI 90763, PI 437654, PI 89772, or PI 438489B, suggesting that these sources of resistance should be used in soybean breeding programs to develop H. glycines-resistant soybean cultivars.

scholarly journals Heterodera glycines Infection Increases Incidence and Severity of Brown Stem Rot in Both Resistant and Susceptible Soybean

Plant Disease ◽  
2003 ◽  
Vol 87 (6) ◽  
pp. 655-661 ◽  
Author(s):  
G. M. Tabor ◽  
G. L. Tylka ◽  
J. E. Behm ◽  
C. R. Bronson
Keyword(s):  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
Cyst Nematode ◽  
Stem Rot ◽  
Growth Chamber ◽  
Susceptible Genotype ◽  
Brown Stem Rot ◽  
Soybean Cultivars ◽  
Phialophora Gregata ◽  
Soybean Genotypes

Growth chamber experiments were conducted to investigate whether parasitism by Heterodera glycines, the soybean cyst nematode, increases incidence and severity of brown stem rot (BSR) of soybean, caused by Phialophora gregata, in both resistant and susceptible soybean cultivars. Soybean genotypes with various combinations of resistance and susceptibility to both pathogens were inoculated with P. gregata alone or P. gregata plus H. glycines. In most tests of H. glycines-susceptible genotypes, incidence and severity of internal stem discoloration, characteristic of BSR, was greater in the presence than in the absence of H. glycines, regardless of susceptibility or resistance to BSR. There was less of an increasing effect of H. glycines on stem symptoms in genotypes resistant to both BSR and H. glycines; however, P. gregata colonization of these genotypes was increased. Stems of both a BSR-resistant and a BSR-susceptible genotype were colonized earlier by P. gregata in the presence than in the absence of H. glycines. Our findings indicate that H. glycines can increase the incidence and severity of BSR in soybean regardless of resistance or susceptibility to either pathogen.

First Report of Soybean Cyst Nematode Reproduction on Purple Deadnettle under Field Conditions

2005 ◽  
Vol 4 (1) ◽  
pp. 1-2 ◽  
Author(s):  
J. Earl Creech ◽  
William G. Johnson ◽  
Jamal Faghihi ◽  
Virginia R. Ferris ◽  
Andreas Westphal
Keyword(s):  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
Field Conditions ◽  
Nematode Reproduction ◽  
First Report

Influence of Intraspecific Henbit (Lamium amplexicaule) and Purple Deadnettle (Lamium purpureum) Competition on Soybean Cyst Nematode Reproduction

Weed Science ◽  
2007 ◽  
Vol 55 (6) ◽  
pp. 665-670 ◽  
Author(s):  
J. Earl Creech ◽  
Jamal Faghihi ◽  
Virginia R. Ferris ◽  
Andreas Westphal ◽  
William G. Johnson
Keyword(s):  
Root Biomass ◽  
Soybean Cyst Nematode ◽  
Egg Production ◽  
Plant Density ◽  
Biomass Accumulation ◽  
Dry Weight ◽  
Cyst Nematode ◽  
Nematode Reproduction ◽  
Greenhouse Study ◽  
Number Of Stems

A greenhouse study was conducted to determine the effect of henbit and purple deadnettle density on weed biomass accumulation and soybean cyst nematode (SCN) reproduction. SCN did not impact shoot or root dry weight of purple deadnettle, henbit, or soybean. Foliar and root biomass of henbit and purple deadnettle were comparable but the biomass per stem was higher for purple deadnettle. Shoot and root biomass per pot of henbit and purple deadnettle at corresponding plant densities were statistically similar and were generally higher with increasing plant density. Henbit produced a greater number of stems than purple deadnettle and the least number of stems for both species existed at low densities. Purple deadnettle allowed for more SCN reproduction than did henbit. Weed densities also influenced SCN cyst and egg production but the results were species dependent. The highest SCN reproduction per pot was supported at low to moderate densities of purple deadnettle but at moderate to high densities of henbit. These results suggest that purple deadnettle should be more aggressively managed than henbit in management programs for SCN, but that henbit, especially at high densities, can support SCN reproduction at levels near those of purple deadnettle.

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