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Submitted to: Germplasm Resources Information Network (GRIN)
Publication Type: Other Publication Acceptance Date: 9/25/2012 Publication Date: 9/25/2012 Citation: Hesler, L.S. 2012. SOYBEAN.DEFOLIATION.1.SD.2011. USDA-ARS Germplasm Resources Information Network (GRIN). Available: www.ars-grin.gov/npgs/. Interpretive Summary: Several kinds of chewing insects feed upon soybean plants, and their infestations may be economically important in some years in the north-central United States. Soybean lines that are resistant to defoliation may be useful for the management of chewing insect pests. Levels of defoliation from chewing insects were characterized among 330 soybean lines in a field-plot test near Brookings, SD, in 2010. Soybean plants incurred defoliation mainly during mid- to late season from natural infestations of chewing insects, including green cloverworms, soybean loopers, and grasshoppers, and to a minor extent from bean leaf beetles. Test lines were evaluated using a rating scale that ranged from 1 (light defoliation) to 3 (severe defoliation). Plants were evaluated on 18 Aug and 19 Aug by consensus of two raters. Three lines had average ratings of 1 (PI 468906, PI 468909, PI 612753A), 16 lines had average ratings of 1.3, and 67 had average ratings of 1.7. The remaining 244 lines had ratings of 2 or greater, including 13 with average ratings of 3. Thus, these findings show that several lines showed strong resistance in light of heavy pressure from insect defoliators. Technical Abstract: Various chewing insects feed upon soybean plants, and their infestations may be economically significant in some years in the north-central United States. Soybean lines that are resistant to defoliation may be useful for management of chewing insect pests. Levels of defoliation from chewing insects were characterized among 330 soybean lines in a field-plot test at the Eastern South Dakota Soil and Water Research Farm near Brookings, SD, in 2010. Soybean plants incurred defoliation mainly during mid- to late season from natural infestations of chewing insects, including green cloverworms, soybean loopers, and grasshoppers, and to a minor extent from bean leaf beetles. Test lines were evaluated using a rating scale that ranged from 1 (light defoliation) to 3 (severe defoliation). Plants were evaluated on 18 Aug and 19 Aug by consensus of two raters. Of the 330 soybean lines rated, three lines had average ratings of 1 (PI 468906, PI 468909, PI 612753A), 16 lines had average ratings of 1.3, and 67 had average ratings of 1.7. The remaining 244 lines had ratings of 2 or greater, including 13 with average ratings of 3. These findings show that several lines showed strong resistance in light of heavy pressure from insect defoliators. |
