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Residual Control of Soybean Loopers in Soybeans, 2013

Residual Control of Soybean Loopers in Soybeans, 2013 Soybean | Glycine max Soybean looper | Chrysodeixis includens lambda-cyhalothrin, chlorantraniliprole, diflubenzuron On 19 July 2013, a foliar insecticide study was conducted to evaluate the efficacy of soybean loopers in soybeans in Brooksville, MS, at the Black Belt Experiment Station. Treatments were arranged in a randomized complete block with four replications. Plot size was four rows by 40 ft long on 38 in centers. Four insecticides were evaluated against the untreated check (UTC) for control of soybean looper (SBL). Insecticides were applied with a tractor-mounted sprayer calibrated to deliver 10.0 gpa at 60 psi using TX-6 Hollow Cone nozzles (two per row) when soybeans were approximately at R1. Treatments were applied approximately 14 d prior to SBL populations infesting plots to evaluate product residual efficacy. Soybean looper population densities were determined at 7, 13, 20, 27, 34, and 41 d after treatment (DAT). Plots were sampled by taking 25 sweeps per plot with a 15-inch-diameter sweep net. Data were analyzed with ANOVA, and means were separated using Fisher’s protected LSD (P ≤ 0.05). At 7, 13, and 20 DAT, there are no significant differences among treatments for numbers of SBL larvae per 25 sweeps (Table 1). At 27 DAT, only Besiege resulted in significantly lower densities of soybean looper larvae compared with the untreated check. At 34 and 41 DAT, none of the insecticide treatments reduced soybean looper densities below those in the untreated check, but plots treated with Besiege had fewer soybean looper larvae compared with plots treated with DoubleTake (3 oz/acre) at 34 DAT or DoubleTake (both rates) at 41 DAT.1 Table 1. Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Means within a column sharing the same letter are not significantly different (LSD; P > 0.05). Open in new tab Table 1. Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Means within a column sharing the same letter are not significantly different (LSD; P > 0.05). Open in new tab 1This study was supported by industry gifts of products and/or research funding. © The Author(s) 2022. Published by Oxford University Press on behalf of Entomological Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://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 journals.permissions@oup.com http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Residual Control of Soybean Loopers in Soybeans, 2013

Arthropod Management Tests , Volume 47 (1): 1 – Jan 1, 2022

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Publisher
Oxford University Press
Copyright
Copyright © 2023 Entomological Society of America
eISSN
2155-9856
DOI
10.1093/amt/tsac001
Publisher site
See Article on Publisher Site

Abstract

Soybean | Glycine max Soybean looper | Chrysodeixis includens lambda-cyhalothrin, chlorantraniliprole, diflubenzuron On 19 July 2013, a foliar insecticide study was conducted to evaluate the efficacy of soybean loopers in soybeans in Brooksville, MS, at the Black Belt Experiment Station. Treatments were arranged in a randomized complete block with four replications. Plot size was four rows by 40 ft long on 38 in centers. Four insecticides were evaluated against the untreated check (UTC) for control of soybean looper (SBL). Insecticides were applied with a tractor-mounted sprayer calibrated to deliver 10.0 gpa at 60 psi using TX-6 Hollow Cone nozzles (two per row) when soybeans were approximately at R1. Treatments were applied approximately 14 d prior to SBL populations infesting plots to evaluate product residual efficacy. Soybean looper population densities were determined at 7, 13, 20, 27, 34, and 41 d after treatment (DAT). Plots were sampled by taking 25 sweeps per plot with a 15-inch-diameter sweep net. Data were analyzed with ANOVA, and means were separated using Fisher’s protected LSD (P ≤ 0.05). At 7, 13, and 20 DAT, there are no significant differences among treatments for numbers of SBL larvae per 25 sweeps (Table 1). At 27 DAT, only Besiege resulted in significantly lower densities of soybean looper larvae compared with the untreated check. At 34 and 41 DAT, none of the insecticide treatments reduced soybean looper densities below those in the untreated check, but plots treated with Besiege had fewer soybean looper larvae compared with plots treated with DoubleTake (3 oz/acre) at 34 DAT or DoubleTake (both rates) at 41 DAT.1 Table 1. Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Means within a column sharing the same letter are not significantly different (LSD; P > 0.05). Open in new tab Table 1. Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Treatment/formation . Rate/acre (oz form) . Average number of SBL larvae per 25 sweeps . . . 7 DAT . 13 DAT . 20 DAT . 27 DAT . 34 DAT . 41 DAT . DoubleTake 3L 4.0 0.1 0.1 1.3 5.4a 13.5ab 29.8a DoubleTake 3L 3.0 0.4 0.7 0.6 5.0a 17.0a 27.3a Dimlin 2L 2.0 0.9 0.6 1.9 4.3a 9.8ab 22.0ab Besiege 1.252SC 7.0 0.0 0.1 0.2 0.3b 3.0b 4.3b Untreated check — 0.3 0.6 1.9 5.1a 8.8ab 15.3ab P > F 0.23 0.70 0.36 0.02 0.01 0.01 Means within a column sharing the same letter are not significantly different (LSD; P > 0.05). Open in new tab 1This study was supported by industry gifts of products and/or research funding. © The Author(s) 2022. Published by Oxford University Press on behalf of Entomological Society of America. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://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 journals.permissions@oup.com

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2022

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