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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #164212
Title: HETERODERA GLYCINES POPULATION DEVELOPMENT ON SOYBEAN TREATED WITH GLYPHOSATE

Author
item Noel, Gregory
item WAX, LOYD - RETIRED USDA EMPLOYEE

Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 4/19/2004
Publication Date: 8/7/2004
Citation: Noel, G.R., Wax, L.M. 2004. Heterodera Glycines population development on soybean treated with glyphosate. Journal of Nematology. 36:337-338.

Interpretive Summary:

Technical Abstract: A concern when planting genetically modified crops is the potential effect of the technology on nontarget organisms. Glyphosate translocates to the soybean root where the herbicide might affect the biology of Heterodera glycines. In 2002 and 2003 Roundup Ready® soybean DSR 320 susceptible to H. glycines and DSR 327 resistant to H. glycines were grown in field plots in two different fields and either sprayed with glyphosate at the recommended rate and time of application or not sprayed. The experiment was arranged in a randomized complete block design with 12 replications. Nematode reproduction (Pf/Pi) and soybean yield were determined. In both years Pi was below the damage threshold, ranging from 72 to 205 eggs/100 cm3 soil in 2002 and from 16 to 133 eggs/100 cm3 soil in 2003. In both years Pf/Pi was greater (P < .0001) on DSR 320 when compared with DSR 327. Differences in Pf/Pi between DSR 320 treated or not treated with glyphosate were significant at P = 0.08 in both 2002 and 2003. There were no significant differences in Pf/Pi between DSR 327 treated with glyphosate or not treated. Soybean yield was not affected either by H. glycines or treatment with glyphosate. Whether or not glyphosate application increases populations of H. glycines is not clear. Additional studies in fields with larger numbers of H. glycines at planting are needed.