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SURVEY OF NEMATODE POPULATIONS AND PREVALENCE IN VIRGINIA CORN AND SOYBEAN FIELDS

Applied Research

David Moore
Crop and Soil Science
SALUDA

Abstract

Nematodes are yield robbing organisms that feed on roots of growing corn and soybean plants. Diagnostic sampling in the last 5 years revealed increases in potentially damaging populations of nematodes. Changes in farming practices have been implicated in this perceived increase. Those changes include; Conversion to no-till cropping systems, movement away from wheat in the crop rotation, lack of resistance to root knot, certain cyst nematode types/races, and other species in soybean varieties and corn hybrids, conversion from in-furrow insecticides to seed-applied insecticides, and a shift to non-”Race 3” types of Soybean Cyst Nematode (SCN) in many soybean fields. Recognizing this problem and the fact that most recent survey information dates back to the 1980’s, the Virginia Corn Board and the Virginia Soybean Board funded a survey project in 2007, 2008, and 2009 to test problem fields in Virginia. During those three years over 150 samples in corn and 250 samples in soybeans have been taken and populations identified. Race determinations done on these samples have shown that SCN Race 1 and Race 4 are present in Virginia soybean fields. There are few Race 1 and Race 4 resistant soybean varieties available. Roughly 40% of the corn samples and 50% of the soybean samples showed that nematode populations were at levels that were considered serious and control options were advised. Surveys show that Root-Knot Nematode(RKN) and Stubby Root are the main problem nematodes in corn, and SCN and RKN are the main problem nematodes in soybeans.

Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: D.M. Moore, T.K. Balderson, W.E. Thomason, D.L. Holshouser, P.M. Phipps, J Eisenbach
  1. Moore, D. Extension Agent, ANR, Crop & Soil Science, Virginia Cooperative Extension, Virginia, 23149
  2. Balderson, T. Extension Agent, ANR, Crop & Soil Science, Virgina Cooperative Extension, Virginia, 22560
  3. Thomason, W. Extension Grains Specialist, CSES Department, Virginia, 24061
  4. Holshouser, D. Extension Soybean Specialist, Tidewater AREC, Virginia, 23437
  5. Phipps, P. Professor of Plant Pathology, Tidewater AREC, Virginia, 23437
  6. Eisenbach, J. Professor of Plant Pathology, PPWS Department, Virginia, 24061