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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #209384
Title: Long and short-term tillage effects on Heterodera glycines reproduction

Author
item Donald, Patricia
item TYLER, DONALD - UNIVERSITY OF TENNESSEE

Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 3/20/2007
Publication Date: 3/30/2007
Citation: Donald, P.A., Tyler, D.D. 2007. Long and short-term tillage effects on Heterodera glycines reproduction. Journal of Nematology. Vol 39:72.

Interpretive Summary:

Technical Abstract: Investigations were conducted to determine the long and short-term effects of tillage on Heterodera glycines, soybean cyst nematode (SCN), reproduction. Tillage plots were established in 1979 representing six tillage/no-tillage regimes. A portion of each plot was changed from no-tillage to chisel or from tilled to no-tillage in 2002. This resulted in 12 treatments with 6 of these long term and 6 short term. There was poor correlation of nematode egg population density at planting or harvest with yield over all four years of the experiment. Egg population density as a result of SCN reproduction however did reflect variety selection even though all varieties were marketed as resistant to at least race 3. The tillage treatments were significant in all years of the experiment. No-tillage plots consistently had higher SCN egg population density than the tilled plots. The most dramatic change in increased SCN reproductive rate was the first two years after the initial long term no-tillage area was chisel tilled. Large increases in SCN reproductive rate after that time were not consistently associated with a particular tillage treatment. Conversion of disc treatment area to no-tillage resulted in lower SCN reproductive rate. Our data suggest that response in SCN population density to tillage change is rapid and most notable during the first season of tillage conversion.