Response of secondary selection on soybean cyst nematode reproduction on resistant soybean lines

1985 ◽  
Vol 4 (2) ◽  
pp. 231-234 ◽  
Author(s):  
S.C. Anand ◽  
C.R. Shumway
Keyword(s):  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
Nematode Reproduction

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.

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.

scholarly journals Use of the Glomus etunicatum as biocontrol agent of the soybean cyst nematode

2021 ◽  
Vol 10 (6) ◽  
pp. e7310615132
Author(s):  
Tatiana Benedetti ◽  
Zaida Inês Antoniolli ◽  
Elisangela Sordi ◽  
Ivan Ricardo Carvalho ◽  
Edson Campanhola Bortoluzzi
Keyword(s):  
Soybean Cyst Nematode ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Cyst Nematode ◽  
Initial Population ◽  
Glomus Etunicatum ◽  
Cyst Nematodes ◽  
Nematode Reproduction ◽  
Soybean Plants ◽  
Disease Pressure

This study investigated the effect of arbuscular mycorrhiza (Glomus etunicatum Becker & Gerd.), on the cyst nematode (Heterodera glycines Ichinohe), in a greenhouse. Mycorrhizal and non-mycorrhizal soybean plants were exposed to the pathogen at different initial population densities (0, 500, 1000, 2000, and 4000 nematodes eggs). Soybean growth, nematode reproduction, and the arbuscular mycorrhizal fungus’s capacity to decrease disease pressure were determined after 60 day-olds. The height of the plants was increased by 26% in the presence of arbuscular mycorrhizal fungus (AMF) despite of a higher initial population of cyst nematodes. The root length was, on average, 32.20% was greater in the presence of AMF. The number of nematodes females found in the root system of mycorrhizal plants was 28.21% lower than in non-mycorrhizal roots. These results suggest that AMF G. etunicatum acts indirectly, promoting an improvement in the nutritional plant status creating tolerance to the presence of the pathogen by soybean.

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.

Assessing the effects of water extract of Narcissus tazetta bulb on hatching, mortality, chemotaxis and reproduction of the soybean cyst nematode, Heterodera glycines

Nematology ◽  
2019 ◽  
Vol 22 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Yanfeng Hu ◽  
Jia You ◽  
Chunjie Li ◽  
Fengjuan Pan ◽  
Congli Wang
Keyword(s):  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
Water Extract ◽  
Cyst Nematode ◽  
Root Tip ◽  
Narcissus Tazetta ◽  
Nematode Reproduction ◽  
Second Stage ◽  
Soybean Roots ◽  
The Impact

Summary The aim of this study was to examine the impact of water extracts of Narcissus tazetta bulb on hatching, behaviour and mortality of second-stage juveniles (J2) and reproduction of the soybean cyst nematode (SCN; Heterodera glycines) in laboratory and glasshouse assays. Results demonstrated that N. tazetta bulb extracts did not affect hatching but significantly reduced J2 motility and nematode attraction to the soybean root tip, and resulted in considerable nematode mortality relative to the control. J2 exposure to different concentrations of bulb extracts caused 59-93% reduction in nematode reproduction on soybean roots. Compared with the monoculture control, soybean-N. tazetta intercropping in a pot trial reduced SCN reproduction by 37%. In addition, N. tazetta bulb powder as a soil amendment is effective in controlling SCN reproduction. Thus, the results suggest that N. tazetta bulb extract or derived active compounds may be considered as potential natural nematicides against SCN.

Comparative host suitability of common bean cultivars to the soybean cyst nematode, Heterodera glycines, in Iran

Nematology ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 335-341
Author(s):  
Naser Safaie ◽  
Zahra Tanha Maafi ◽  
Ebrahim Pourjam ◽  
Ramin Heydari
Keyword(s):  
Common Bean ◽  
Soybean Cyst Nematode ◽  
Field Experiments ◽  
Heterodera Glycines ◽  
Field Trials ◽  
Cyst Nematode ◽  
Host Suitability ◽  
Nematode Reproduction ◽  
Pot Trials ◽  
Moderately Resistant

AbstractThe first occurrence of soybean cyst nematode, Heterodera glycines, on beans in Iran was documented when a cyst-forming nematode was detected in a commercial common bean (Phaseolus vulgaris) field in Iran and subsequently identified as H. glycines. The population was identified as HG Type 0. Host suitability of the 11 P. vulgaris cultivars most commonly grown in the country were evaluated with that population in pot and field trials. Pot assays were conducted in a growth chamber and nematode reproduction on the cultivars was compared. In the field trials, host suitability of the tested entries was evaluated in a field naturally infested with H. glycines. In both the pot and field experiments, most of the common bean cultivars were susceptible or moderately susceptible to the HG Type 0 populations of H. glycines. Common bean cvs Sayad and Dehghan were classified as moderately resistant in pot trials and were moderately resistant and moderately susceptible, respectively, in field trials. The occurrence of H. glycines in commercial bean production fields and lack of high levels of resistance of the commonly grown P. vulgaris cultivars could severely affect common bean and soybean production programmes in Iran.

Potential for Soybean Cyst Nematode Reproduction on Winter Weeds and Cover Crops in Tennessee

2007 ◽  
Vol 8 (1) ◽  
pp. 25 ◽  
Author(s):  
P. A. Donald ◽  
Robert Hayes ◽  
Eric Walker
Keyword(s):  
Population Density ◽  
Cover Crops ◽  
Cover Crop ◽  
Soybean Cyst Nematode ◽  
Management Strategies ◽  
Cyst Nematode ◽  
No Tillage ◽  
Nematode Reproduction ◽  
Tillage Practices ◽  
Crimson Clover

The soybean cyst nematode (SCN), Heterodera glycines, is a major yield limiting pest of soybean (Glycine max). Current SCN management strategies include resistant soybean varieties and rotation with non-host crops. Increased adoption of the early soybean production system (ESPS) combined with a greater incidence of winter weeds from no-tillage practices may increase the population density of SCN during the noncrop period since several winter weeds and cover crops are hosts for SCN. A field experiment with a split-strip design was conducted over three years to evaluate whether SCN reproduced on weeds and cover crops during the noncrop period. Winter weeds and crimson clover roots were examined for females and cysts with eggs. The soil was sampled to determine if an increase in SCN egg population density occurred. We found no indication of SCN reproduction on winter weeds during the noncrop period or on the cover crop crimson clover. Accepted for publication 2 November 2006. Published 26 February 2007.

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