Prochaska, T. J.Pierson, L. M.Baldin, E. L. L.Hunt, T. E.Heng-Moss, T. M.Reese, John C.2013-07-162013-07-162013-07-16http://hdl.handle.net/2097/15986Citation: Prochaska, T. J., L. M. Pierson, E.L.L. Baldin, T. E. Hunt, T. M. Heng-Moss, and J. C. Reese. (2013). Evaluation of Late Vegetative and Reproductive Stage Soybeans for Resistance to Soybean Aphid (Hemiptera: Aphididae). Journal of Economic Entomology 106(2): 1036–44. https://doi.org/10.1603/EC12320.The soybean aphid, Aphis glycines Matsumura, has become the most significant soybean [Glycine max (L.) Merrill] insect pest in the north central soybean production region of North America. The objectives of this research were to measure selected genotypes for resistance to the soybean aphid in the later vegetative and reproductive stages under field conditions, and confirm the presence of tolerance in KS4202. The results from 2007 to 2011 indicate that KS4202 can support aphid populations with minimal yield loss at levels where significant yield loss would be expected in most other genotypes. The common Nebraska cultivar, `Asgrow 2703′, appears to show signs of tolerance as well. None of the yield parameters were significantly different between the aphid infested and noninfested treatments. Based on our results, genotypes may compensate for aphid feeding in different ways. Asgrow 2703 appears to produce a similar number of seeds as its noninfested counterpart, although the seeds produced are slightly smaller. Field evaluation of tolerance in KS4202 indicated a yield loss of only 13% at 34,585-53,508 cumulative aphid-days, when 24-36% yield loss would have been expected.en-US© 2013 Entomological Society of America This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.comhttp://creativecommons.org/licenses/by-nc/3.0/Host plant resistanceToleranceAphis glycinesText