Location: Integrated Cropping Systems ResearchTitle: Soy to the world! Plant resistance to South Dakota's most virulent soybean aphids
|CONZEMIUS, SOPHIA - South Dakota State University|
|VARENHORST, A - South Dakota State University|
|TILMON, K - The Ohio State University|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 12/5/2017
Publication Date: 12/14/2017
Citation: Conzemius, S., Hesler, L.S., Varenhorst, A., Tilmon, K. 2017. Soy to the world! Plant resistance to South Dakota's most virulent soybean aphids [abstract]. North Central Branch of Entomological Society of America, Madison WI, March 18-21, 2018.
Technical Abstract: South Dakota soybean aphid (Aphis glycines Matsumura, SBA) populations can overcome commercially-available aphid-resistant soybeans [Glycine max (L.) Merr.] as well as pyrethroid insecticides. By utilizing stronger sources of SBA-plant resistance, we can protect soybean from a larger spectrum of SBA diversity and minimize insecticide applications. SBA biotype 4 overcomes Rag1, Rag2, Rag1 + Rag2, and Rag3 resistant soybeans and was the focus of this research. Twenty soja (Glycine soja Sieb. & Zucc.) and 50 soybean plant introductions (PIs) were screened for resistance to SBA biotype 4 collected in Volga, SD in 2015 and 2016. Preliminary tests allowed SBA to feed freely on randomized PIs for two weeks; PIs with consistently low populations were considered putatively resistant. No-choice tests confined putatively resistant PIs individually with six aphids per plant; mean aphid populations were evaluated 10 and 20 days after infestation. Soja PI 65549 and soybean PI 437696 and PI 567598B were highly resistant to SD SBA biotype 4. The strong resistance identified in these PIs could be used for host plant resistance breeding in high-yielding SD soybean cultivars to protect yield while reducing input costs.