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

Published online by Cambridge University Press:  20 January 2017

Rodrigo Werle ,
Loren J. Giesler ,
Mark L. Bernards  and
John L. Lindquist
Rodrigo Werle
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE 68583
Loren J. Giesler
Affiliation:
Department of Plant Pathology, University of Nebraska-Lincoln, Lincoln, NE 68583
Mark L. Bernards
Affiliation:
School of Agriculture, Western Illinois University, Macomb, IL 61455
John L. Lindquist*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE 68583
*
Corresponding author's E-mail: jlindquist1@unl.edu.
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Abstract

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.

El nematodo cístico de la soja (SCN) es la enfermedad que más limita el rendimiento de la soja en los Estados Unidos. Lamium amplexicaule es una especie anual de invierno común en campos con labranza cero, y que se conoce que actúa como hospedero alternativo de SCN. Se realizó una simulación para estimar qué tan probable fue la reproducción de SCN en raíces de L. amplexicaule durante un período de 30 años en dos áreas importantes de soja en Nebraska. Las simulaciones se realizaron usando información publicada acerca de la emergencia de plántulas de L. amplexicaule, reproducción de SCN en raíces de L. amplexicaule, y la respuesta de SCN a la temperatura del suelo. Los resultados indican que SCN podría ser capaz de completar una generación en raíces de L. amplexicaule en las condiciones de Nebraska. No fue probable que el ciclo reproductivo de SCN se completara antes del invierno en el sur-central de Nebraska, pero se predijo que se completaría una generación de SCN en el otoño en 2 de los 30 años de simulación (7% de probabilidad) en el sureste de Nebraska. Con base en nuestras predicciones, para reducir las oportunidades de aumentos en las poblaciones de SCN en ausencia de su hospedero principal (soja) en Nebraska, el manejo de malezas en campos infestados con L. amplexicaule y SCN debe ser completado después de la cosecha del cultivo en el otoño, cuando las plántulas de L. amplexicaule han emergido y están creciendo, pero el SCN que está desarrollándose en raíces de L. amplexicaule no ha alcanzado la madurez.

Keywords

Henbit, Lamium amplexicaule L. LAMAMsoybean cyst nematode, Heterodera glycines IchinoheSCN reproductionSCN alternative hostwinter annual weedthermal time
Type
Research Article
Information
Weed Technology , Volume 29 , Issue 1 , March 2015 , pp. 35 - 41
Copyright
Copyright © Weed Science Society of America 

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