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Survey of Broadleaf Winter Weeds in Indiana Production Fields Infested with Soybean Cyst Nematode (Heterodera Glycines)

Published online by Cambridge University Press:  20 January 2017

J. Earl Creech*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
William G. Johnson
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
*
Corresponding author's E-mail: ecreech@purdue.edu.

Abstract

Fifty-five soybean cyst nematode (SCN)–infested production fields across Indiana were surveyed in March 2004 to assess broadleaf winter weed prevalence. The most frequently occurring weeds were common chickweed (87%), speedwell (83%), buttercup (58%), and henbit (53%). Henbit and wild garlic were present at the highest average densities, both occurring at greater than 50 plants/m2. Based on relative abundance indices, common chickweed and henbit were the most prevalent winter weeds in this survey. As a composite, winter weed hosts of SCN were found in 93% of fields and occurred at an average density of 151 plants/m2. No correlation existed between weed density and SCN egg counts. Frequency, uniformity, density, and diversity indices for individual weed species were generally higher in the southern region of Indiana than in the north. Thus, the region of highest risk for SCN reproduction and population increase on winter weeds in Indiana appears to be in the southern part of the state.

Type
Extension/Outreach
Copyright
Copyright © Weed Science Society of America 

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