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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #148476
Title: POTENTIAL YIELD LOSS WHEN PLANTING HETERODERA GLYCINES RESISTANT CULTIVARS

Author
item Noel, Gregory
item BAUER, STEVEN - UNIV OF ILLINOIS

Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 7/12/2003
Publication Date: 9/1/2003
Citation: Noel, G.R., Bauer, S.J. 2003. Potential yield loss when planting Heterodera glycines resistant cultivars. [abstract]. Journal of Nematology. 35:355-356.

Interpretive Summary:

Technical Abstract: Soybean producers are concerned that planting Heterodera glycines-resistant soybean cultivars either in non-infested fields or fields with low numbers of H. glycines sacrifices yield. Seven fields located in central Illinois and western Indiana, ranging from no infestation to moderate levels of infestation with H.glycines, were planted with a susceptible cultivar, a cultivar with a low level of resistance from PI88.788 resistance, a cultivar with a high level of resistance from PI88.788, and a cultivar carrying resistance from Peking. Plots ranged from 100 to 800 m long and 40 to 150 m wide. Each cultivar was arranged in a randomized complete block design and replicated three times. All farming operations were done with the producers' equipment. Numbers of H. glycines eggs were determined at planting and at harvest. Yield was determined with a weigh wagon, and moisture was corrected to 13%. Nematode reproduction differed among cultivars and locations. Yield of the susceptible cultivar was greater in fields with no H.glycines or low levels of infestation. When the level of infestation reached 200 eggs/150 cm3 soil, there was a yield advantage when the cultivar with the high level of resistance from PI88.788 and the cultivar with Peking resistance were planted. Higher levels of infestation were required before planting the cultivar with the low level of PI88.788 resistance became advantageous. Although progress has been made in equalizing the yield potential of H. glycines-susceptible and resistant cultivars, developing equivalent yield potential in fields either with no H. glycines or low levels of infestation remains elusive.