Likelihood of Soybean Cyst Nematode (Heterodera glycines) Reproduction on Henbit (Lamium amplexicaule) Roots in Nebraska

2015 ◽  
Vol 29 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Rodrigo Werle ◽  
Loren J. Giesler ◽  
Mark L. Bernards ◽  
John L. Lindquist
Keyword(s):  
United States ◽  
Weed Management ◽  
Soybean Cyst Nematode ◽  
Seedling Emergence ◽  
The United States ◽  
Cyst Nematode ◽  
South Central ◽  
Main Host ◽  
Winter Annual ◽  
Production Areas

Soybean cyst nematode (SCN) is a major soybean yield–limiting disease in the United States. Henbit, a winter annual species common to no-till fields in the midwestern United States, is known to act as an alternative host for SCN. A simulation was performed to estimate how likely SCN was to reproduce on henbit roots during a 30-yr period in two important soybean production areas of Nebraska. Simulations were conducted using published information on henbit seedling emergence, SCN reproduction on henbit roots, and SCN response to soil temperature. Results indicate that SCN would be able to complete one generation on henbit roots under Nebraska conditions. The SCN reproductive cycle was not likely to be completed before the winter in south central Nebraska, but one SCN generation was predicted to be completed in the fall in 2 out of 30 simulation years (7% likelihood) in southeast Nebraska. Based on our predictions, to reduce the chances of SCN population build-up in the absence of its main host (soybean), weed management in fields infested with both henbit and SCN should be completed after crop harvest in the fall when most henbit seedlings have emerged and are growing but the SCN developing on henbit roots have not yet achieved full maturity in Nebraska.

Influence of Winter Annual Weed Management and Crop Rotation on Soybean Cyst Nematode (Heterodera glycines) and Winter Annual Weeds: Years Four and Five

Weed Science ◽  
2012 ◽  
Vol 60 (4) ◽  
pp. 634-640 ◽  
Author(s):  
Valerie A. Mock ◽  
J. Earl Creech ◽  
Virginia R. Ferris ◽  
Jamal Faghihi ◽  
Andreas Westphal ◽  
...  
Keyword(s):  
United States ◽  
Population Density ◽  
Weed Management ◽  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
Weed Density ◽  
Weed Growth ◽  
Winter Annual ◽  
Winter Annual Weeds ◽  
Annual Weeds

Certain winter annual weeds have been documented as alternative hosts to soybean cyst nematode (SCN), and infestations by such species are common in no-till production fields in the midwestern United States of Indiana, Ohio, and Illinois. The objective of this research was to determine the influence of crop rotation and winter annual weed management on winter weed growth, SCN population density, and crop yield. Two crop rotations (SS and soybean–corn rotation) and six winter annual weed-management systems (autumn-applied herbicide, spring-applied herbicide, autumn + spring applied herbicides, autumn-seeded Italian ryegrass, autumn-seeded wheat, and a nontreated check) were evaluated in long-term, no-tillage systems at West Lafayette, IN, and Vincennes, IN. In the fourth and fifth years of these experiments, the 2-yr corn–soybean rotation generally resulted in increased soybean yield, decreased winter annual weed growth, and reduced SCN population density compared with SS. Autumn or spring herbicide applications or both were a more effective option than cover crops at reducing winter annual weed density. Cover-crop systems generally did not differ from the nontreated check in winter weed density. Between years three and five, winter annual weed SCN hosts in nontreated check plots increased approximately threefold to levels as high as 102 and 245 plants m−2 at West Lafayette, IN, and Vincennes, IN, respectively, which are infestation levels at or above those commonly observed in production fields. However, controlling winter annual weeds did not influence crop yields or SCN population density. The results of these studies suggest that winter weed management, even at the high levels of weed infestation present in these studies, appears to have little value as a tool for SCN management in corn and soybean production systems in the midwestern United States.

scholarly journals Known Distribution of the Soybean Cyst Nematode, Heterodera glycines, in the United States and Canada, 1954 to 2017

2017 ◽  
Vol 18 (3) ◽  
pp. 167-168 ◽  
Author(s):  
Gregory L. Tylka ◽  
Christopher C. Marett
Keyword(s):  
United States ◽  
New York ◽  
North America ◽  
North Dakota ◽  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
The United States ◽  
Cyst Nematode ◽  
The State ◽  
Introduced Pest

The soybean cyst nematode (SCN) is a major yield-reducing pathogen of soybeans in North America. The nematode is an introduced pest and, therefore, knowledge of the distribution of SCN can be helpful in identifying areas where scouting and management efforts should be focused. Such information is especially important because yield-reducing infestations of SCN can occur without obvious above-ground symptoms appearing. In late 2016, nematologists, plant pathologists, and state plant regulatory officials from the soybean-producing states in the United States and provinces in Canada were queried to obtain the latest information on where the nematode had been found. An updated map of the known distribution of SCN in North America was also created. There were 17 states in which SCN was newly found since 2014, when the map was last updated, including the first discovery of SCN in the state of New York. North Dakota was the state with the greatest number of counties, seven, in which SCN had been newly discovered since 2014. This updated information illustrates that the nematode continues to spread throughout the soybean-growing areas of the continent and emphasizes that continued efforts to scout for and manage SCN are warranted.

Determination of weed hosts of soybean cyst nematode in South Dakota

2019 ◽  
Vol 34 (3) ◽  
pp. 377-382
Author(s):  
Pawan Basnet ◽  
Sharon A. Clay ◽  
Emmanuel Byamukama
Keyword(s):  
South Dakota ◽  
Weed Management ◽  
Soybean Cyst Nematode ◽  
The United States ◽  
Cyst Nematode ◽  
Corn Belt ◽  
Management Approach ◽  
Weed Species ◽  
Weed Hosts

AbstractSoybean cyst nematode (SCN) causes over $1.2 billion in revenue loss annually in the United States and consistently ranks as the most threatening pathogen for soybean. SCN weed hosts have been documented in other states in the eastern Corn Belt, but very little work has been done in the midwestern Corn Belt. To determine alternative SCN weed hosts in South Dakota, 670 whole weed root samples comprising 63 weed species were collected from 48 SCN-positive fields in 13 counties during fall 2016 and spring 2017. Among the 63 weed species, 12 contained SCN juveniles and 7 were confirmed hosts of SCN based on the completion of the SCN life cycle in greenhouse studies. Ranking of female index (FI) for the weed hosts were purple deadnettle (FI = 34.6) > field pennycress (FI = 26.9) > common mallow (FI = 2.04) > shepherd’s purse (FI = 1.89) > white clover (FI = 1.86) > Canada thistle (FI = 1.24) > common cocklebur (FI = 1.10). These results indicate that some weeds can support SCN, and therefore a proactive weed management approach should be employed for fields infested with SCN.

scholarly journals Known Distribution of the Soybean Cyst Nematode, Heterodera glycines, in the United States and Canada in 2020

2021 ◽  
Author(s):  
Gregory L. Tylka ◽  
Christopher C. Marett
Keyword(s):  
United States ◽  
Glycine Max ◽  
Health Professionals ◽  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
The United States ◽  
Cyst Nematode ◽  
Soil Sampling ◽  
Rural Municipalities ◽  
Canadian Provinces

In the United States and Canada, the most damaging pathogen of soybean, Glycine max, is the soybean cyst nematode (SCN), Heterodera glycines. Plant health professionals working for universities and state and provincial departments of agriculture in the United States and Canada are queried periodically about counties and rural municipalities that are newly known to be infested with SCN in their states and provinces. Such a census was conducted in 2020, and the results were compared with results of the most recent survey, published in 2017. Between 2017 and 2020, 55 new SCN-infested counties were reported from 11 U.S. states. Also, 24 new SCN-infested counties and rural municipalities were identified in the Canadian provinces of Manitoba, Ontario, and Quebec. A map of the known distribution of SCN in these two countries was updated. The results reveal steady expansion of the distribution of SCN throughout the United States and Canada, and the pest almost certainly will continue to spread among and within soybean-producing areas of these countries in the future. Therefore, continued scouting and soil sampling for detection of new SCN infestations are warranted as the first step toward successfully managing the pathogen.

Distribution of the Soybean Cyst Nematode, Heterodera glycines, in the United States and Canada: 1954 to 2014

2014 ◽  
Vol 15 (2) ◽  
pp. 85-87 ◽  
Author(s):  
Gregory L. Tylka ◽  
Christopher C. Marett
Keyword(s):  
United States ◽  
North America ◽  
Soybean Cyst Nematode ◽  
Yield Loss ◽  
Heterodera Glycines ◽  
The United States ◽  
Cyst Nematode ◽  
The Usa ◽  
Initial Discovery

The soybean cyst nematode (Heterodera glycines) is considered the most damaging pathogen of soybean in the USA and Canada, and causes considerable yield loss in many other soybean-producing countries. It is believed to have been introduced into North America from Asia. The map of the known distribution of H. glycines in the USA and Canada has been updated for 2014. Maps of its known distribution in past years illustrate the spread of the pathogen since its initial discovery in the United States in 1954. Accepted for publication 20 April 2014. Published 27 May 2014.

scholarly journals Soybean Cyst Nematode (Heterodera glycines) Distribution in North Carolina, U.S.A.

2017 ◽  
Vol 18 (4) ◽  
pp. 230-232 ◽  
Author(s):  
Weimin Ye
Keyword(s):  
United States ◽  
North Carolina ◽  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
Population Level ◽  
The United States ◽  
Cyst Nematode ◽  
Soil Samples ◽  
Survey Results ◽  
Production Losses

Soybean cyst nematode (SCN), Heterodera glycines Ichinohe, is an obligate, sedentary, and devastating parasite that is a major pathogen of soybean and accounts for an estimated $1.2 billion in production losses annually in the United States. SCN was first discovered in the United States in New Hanover County, North Carolina, in 1954. This report summarizes lab assay and survey results from July 1, 2014, to June 30, 2017. In this period, 100,118 grower samples were assayed for nematodes. SCN was detected in 21,922 of the soil samples (21.9%). The overall population level was 110 ± 266 (10 to 14,600) per 500 cm3 of soil. Based on the assay results from grower and survey soil samples, Anson, Catawba, Chatham, Dare, and Lincoln counties were added to the list of SCN-positive counties documented by June 30, 2014, bringing the total to 57. Johnston (3,462 SCN-positive samples), Wayne (3,274), Nash (2,960), Wilson (2,039), and Pasquotank (1,513) had the most SCN-positive samples. Montgomery (831 SCN/500 cm3 of soil on average), Bladen (790), Washington (610), Carteret (607), and Harnett (368) were found to have the highest SCN population levels.

Influence of Winter Annual Weed Management and Crop Rotation on Soybean Cyst Nematode (Heterodera Glycines) and Winter Annual Weeds

Weed Science ◽  
2008 ◽  
Vol 56 (1) ◽  
pp. 103-111 ◽  
Author(s):  
J. Earl Creech ◽  
Andreas Westphal ◽  
Virginia R. Ferris ◽  
Jamal Faghihi ◽  
Tony J. Vyn ◽  
...  
Keyword(s):  
Crop Rotation ◽  
Weed Management ◽  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
Cyst Nematode ◽  
Winter Annual ◽  
Winter Annual Weeds ◽  
Annual Weeds

scholarly journals Weeds Hosting the Soybean Cyst Nematode (Heterodera glycines Ichinohe): Management Implications in Agroecological Systems

Agronomy ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 146
Author(s):  
Leonardo F. Rocha ◽  
Karla L. Gage ◽  
Mirian F. Pimentel ◽  
Jason P. Bond ◽  
Ahmad M. Fakhoury
Keyword(s):  
Weed Management ◽  
Soybean Cyst Nematode ◽  
Heterodera Glycines ◽  
Integrated Management ◽  
Cropping System ◽  
Cyst Nematode ◽  
Weed Species ◽  
Initial Inoculum ◽  
Herbicide Resistant ◽  
Sites Of Action

The soybean cyst nematode (SCN; Heterodera glycines Ichinohe) is a major soybean-yield-limiting soil-borne pathogen, especially in the Midwestern US. Weed management is recommended for SCN integrated management, since some weed species have been reported to be hosts for SCN. The increase in the occurrence of resistance to herbicides complicates weed management and may further direct ecological–evolutionary (eco–evo) feedbacks in plant–pathogen complexes, including interactions between host plants and SCN. In this review, we summarize weed species reported to be hosts of SCN in the US and outline potential weed–SCN management interactions. Plants from 23 families have been reported to host SCN, with Fabaceae including most host species. Out of 116 weeds hosts, 14 species have known herbicide-resistant biotypes to 8 herbicide sites of action. Factors influencing the ability of weeds to host SCN are environmental and edaphic conditions, SCN initial inoculum, weed population levels, and variations in susceptibility of weed biotypes to SCN within a population. The association of SCN on weeds with relatively little fitness cost incurred by the latter may decrease the competitive ability of the crop and increase weed reproduction when SCN is present, feeding back into the probability of selecting for herbicide-resistant weed biotypes. Therefore, proper management of weed hosts of SCN should be a focus of integrated pest management (IPM) strategies to prevent further eco–evo feedbacks in the cropping system.

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