Downloaded from https://academic.oup.com/amt/article/46/1/tsab010/6129695 by DeepDyve user on 09 February 2021 applyparastyle "fig//caption/p" parastyle "FigCapt" applyparastyle "fig" parastyle "Figure" Arthropod Management T ests, 46(1), 2021, 1–2 doi: 10.1093/amt/tsab010 Section F: Field & Cereal Crops SOYBEAN: Glycine max (L.) Merr., ‘Asgrow AG32X8’ HeadA=HeadB=HeadA=HeadB/HeadA 1, Erin W. Hodgson and Mitchell Helton HeadB=HeadC=HeadB=HeadC/HeadB Department of Entomology, Iowa State University, Ames, IA 50011-1101 and Corresponding author, e-mail: firstname.lastname@example.org HeadC=HeadD=HeadC=HeadD/HeadC Extract3=HeadA=Extract1=HeadA Section Editor: Donald Cook History=Text=History=Text_First Soybean | Glycine max EDI_HeadA=EDI_HeadB=EDI_HeadA=EDI_HeadB/HeadA Soybean gall midge (SGM) | Resseliella maxima Gagné EDI_HeadB=EDI_HeadC=EDI_HeadB=EDI_HeadC/HeadB EDI_HeadC=EDI_HeadD=EDI_HeadC=EDI_HeadD/HeadC Soybean gall midge, Resseliella maxima Gagné is a new pest recently were found shortly after. Adult emergence was almost completely EDI_Extract3=EDI_HeadA=EDI_Extract1=EDI_HeadA confirmed on soybean in the U.S. Notable populations and economic continuous throughout the summer, with three generations of adults loss was observed in the northcentral region in 2018, 2019, and being observed. Foliar applications at the V2 growth stage were ERR_HeadA=ERR_HeadB=ERR_HeadA=ERR_HeadB/HeadA 2020 (i.e., Iowa, Minnesota, Missouri, Nebraska, South Dakota). In made on 9 Jun at the ISU Northwest Research Farm and 4 Jun at the ERR_HeadB=ERR_HeadC=ERR_HeadB=ERR_HeadC/HeadB 2020, we established efficacy plots at two locations. The soybean Griswold Farm. Foliar applications at 10 days after adult emergence ERR_HeadC=ERR_HeadD=ERR_HeadC=ERR_HeadD/HeadC variety Asgrow AG32X8 was used in all trials. The first location was were made on 25 Jun at the ISU Northwest Research Farm and 22 at the Iowa State University Northwest Research Farm in O’Brien Jun at the Griswold Farm. For the Northwest Research Farm, fo- ERR_Extract3=ERR_HeadA=ERR_Extract1=ERR_HeadA County, Iowa. The treatments were arranged in a randomized com- liar treatments made on 9 Jun were applied using a custom sprayer plete block design with four replications, and soybean was planted and TeeJet (Springfield, IL) flat fan nozzles (XR8002) with 20 gpa in 30-inch rows using standard production practices on 24 Apr. Each of water at 40 lb psi. All remaining treatments at both locations plot was four rows wide and 30 ft long. In total, we evaluated 12 were made using a backpack sprayer and TeeJet twin jet nozzles (TJ- treatments (Table 1). The second location was at a commercial farm 60 11002) with 20 gpa of water at 40 lb psi. Yield (bu/acre) was near Griswold, Iowa in Cass County. The treatments were arranged taken from the center two rows and determined by weighing grain in a randomized complete block design with four replications, with a hopper and corrected to 13% moisture. The plots at the ISU and soybean was planted in 30-inch rows using standard produc- Northwest Research Farm were harvested on 30 Sep and the plots tion practices on 23 Apr. Each plot was four rows wide and 30 ft at the commercial farm were harvested on 6 Oct (Tables 1 and 2). long. In total, we evaluated 12 treatments (Table 2). SGM injury A one-way analysis of variance (ANOVA) was used to determine was evaluated using a visual rating system. All plots were evaluated yield treatment effects within each experiment. Mean separation for larval injury from Jul through Sep and assessed on a 4-point for all treatments were achieved using a least significant differences scale (0-no injury; 1-at least 25% injury; 2-at least 50% injury; (LSD) test (alpha = 0.05). All statistical analyses were performed and 3-at least 75% injury). Final injury ratings were taken at the using SAS® software (SAS 9.4). ISU Northwest Research Farm and Griswold Farm on 7 Sep and 9 Injury was light at both locations, with a final mean injury rating Sep, respectively. Treatments were given a final mean injury rating of 0.18 ± 0.02 at the ISU Northwest Research Farm (Table 1) and representing the final injury ratings across the four replications. 0.58 ± 0.03 at the Griswold Farm (Table 2). Yields did not appear to Adult SGM emergence began mid-June and midge-infested plants be impacted by SGM at either location. This research was supported by industry gift(s) of seed, pesticides, and financial support. © The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/ licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact email@example.com Downloaded from https://academic.oup.com/amt/article/46/1/tsab010/6129695 by DeepDyve user on 09 February 2021 2 Arthropod Management T ests, 2021, Vol. 46, No. 1 Table 1. Rate/acre Application Injury rating Treatment/Formulation (fl oz form.) Date 7 Sep Yield (bu/acre) Untreated Check - - 0.13a 55.3a Belay 2.13SC 6.0 9 Jun 0.19a 51.6a Asana XL 0.66EC 9.6 9 Jun 0.06a 54.6a Belay 2.13SC 6.0 25 Jun 0.25a 52.9a Asana XL 0.66EC 9.6 25 Jun 0.13a 51.2a Belay 2.13SC + Asana XL 0.66EC 6.0 + 9.6 9 Jun 0.25a 52.1a RyzUp 40SG 0.5 9 Jun 0.25a 54.9a Asana XL 0.66EC + Knack 0.86EC 9.6 + 9.0 25 Jun 0.19a 55.4a Belay 2.13SC + Knack 0.86EC 6.0 + 9.0 25 Jun 0.25a 53.7a Fungicide ST - - 0.06a 53.6a b c Gaucho 5FS + fungicide ST 0.12 - 0.19a 56.4a b c Gaucho 5FS + fungicide ST 0.2336 - 0.19a 54.3a P>F 0.1082 0.9053 Means within columns not followed by the same letter are significantly different, alpha=0.05, LSD. Plots planted with seed that did not have an insecticide or fungicide seed treatment. Fungicide ST includes: prothioconazole 0.012 mg ai/seed + fluoxastrobin 0.012 mg ai/seed + metalaxyl 0.025 mg ai/seed applied as seed treatment. mg AI/seed. Table 2. Rate/acre Application Injury rating Treatment/Formulation (fl oz form.) Date 9 Sep Yield (bu/acre) Untreated Check - - 0.44a 65.9a Belay 2.13SC 6.0 4 Jun 0.56a 60.5a Asana XL 0.66EC 9.6 4 Jun 0.63a 68.7a Belay 2.13SC 6.0 22 Jun 0.69a 64.5a Asana XL 0.66EC 9.6 22 Jun 0.69a 66.9a Belay 2.13SC + Asana XL 0.66EC 6.0 + 9.6 4 Jun 0.50a 64.1a RyzUp 40SG 0.5 4 Jun 0.50a 64.7a Asana XL 0.66EC + Knack 0.86EC 9.6 + 9.0 22 Jun 0.50a 65.0a Belay 2.13SC + Knack 0.86EC 6.0 + 9.0 22 Jun 0.75a 63.6a Fungicide ST - - 0.56a 67.6a b c Gaucho 5FS + fungicide ST 0.12 - 0.50a 65.8a b c Gaucho 5FS + fungicide ST 0.2336 - 0.69a 64.6a P>F 0.9924 0.7344 Means within columns not followed by the same letter are significantly different, alpha = 0.05, LSD. Plots planted with seed that did not have an insecticide or fungicide seed treatment. Fungicide ST includes: prothioconazole 0.012 mg ai/seed + fluoxastrobin 0.012 mg ai/seed + metalaxyl 0.025 mg ai/seed applied as seed treatment. mg AI/seed.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2021