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Reniform Nematode Reproduction on Soybean in Tests Conducted in 2003

R.T. Robbins, L. Rakes, L.E. Jackson, E.E. Gbur, and D.G. Dombek

ABSTRACT

In 2003 greenhouse pot experiments, 129 soybean varieties from the Arkansas variety testing program were tested to determine their suitability as hosts for the reniform nematode, Rotylenchulus reniformis. The R. reniformis-resistant varieties Forrest and Hartwig, the susceptible variety Braxton, and fallow-R. reniformis-infested soil served as controls. Total number of eggs and nematodes extracted from both the soil and roots from each pot, reproductive indices (RI = Pf/Pi), RI/RI of Forrest (RF), RI/RI of Hartwig (RH), log ratio [log10 (RF + 1)], log ratio [log10 (RH + 1)], RF calculated from log10 (RF + 1), and RH calculated from log10 (RH + 1) were calculated for each cultivar or breeding line. Varieties with RF=s significantly greater than the RF on Forrest (1.00) were considered suitable hosts for R. reniformis. In the 2003 Arkansas variety test 122 of 129 lines had significantly more reproduction than Forrest when the log ratio [log10 (RF + 1)] were compared. All lines including Forrest had more reproduction than Hartwig when the log ratio [log10 (RH + 1)] were compared.





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Document last modified 04/27/04