| Abstrakt: |
The susceptibility of 40 soybean cultivars to the southern root-knot nematode (Meloidogyne incognita) was evaluated in 4 field trials. In all trials, the damage threshold was severe, with an average population density of 234 second-stage juveniles(J2)/100 cm3 of soil at harvest. Host susceptibility was based on the percent of root system galled at the R5-R6 growth stage. Cultivars were considered very resistant if the root system galled percentage was between 0.0% to 1.0%, resistant from 1.1% to 4.0%, and moderately resistant from 4.1% to 9.0%. Of the maturity group (MG) 4 Roundup Ready/Xtend® and Enlist® E3 cultivars, Delta Gro DG4940, Progeny P4431E3, Armor EN21E42, Pioneer 46A35, Delta Gro DG46E10, Pioneer P43A42X, Armor EN21E49, and Petrus Seed 49G16GT were moderately resistant. At the same time, Pioneer 45A29L-SA2P was resistant in the Liberty Link® trial. In the maturity group 5 Roundup Ready/Xtend and Enlist E3 trial, Pioneer P52A05X and Syngenta S55-Q3 were resistant, Pioneer P53A74BX, Pioneer P54A54X, Pioneer P55A49X, Progeny P5424XF, Syngenta NKS61-M2X, and Progeny P5554RX were moderately resistant. In contrast, Pioneer P52A43L-SA2P was very resistant in the Liberty Link® trial. The 3 resistant cultivars would be a preferred choice in fields with a high density of southern root-knot nematode; however, the other fourteen moderately resistant cultivars would be useful at lower nematode densities. [ABSTRACT FROM AUTHOR] |
