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Control of Walnut Aphid in Walnuts, 2015 *

Control of Walnut Aphid in Walnuts, 2015 * Arthropod Management Tests, 2016, 1–1 doi: 10.1093/amt/tsw034 Section D: Citrus, Nuts, and Other Tree Fruits WALNUT: Juglans regia L., ‘Chandler’ 1,2 3 4 Robert A. Van Steenwyk, Alyssa M. Hernandez, Ruth A. Poliakon, and Benjamin J. Wong Department of E.S.P.M., 130 Mulford Hall – 3114, University of California, Berkeley, CA 94720-3114, Phone: (510) 643-5159, Fax: (510) 643-5438 (bobvanst@berkeley.edu), Corresponding author, e-mail: bobvanst@berkeley.edu, 3 4 Harvard University, 26 Oxford St., Cambridge, MA 02138, (ahernandez@g.harvard.edu), (poliakon@berkeley.edu), and (benjwong@berkeley.edu) Subject Editor: David Haviland walnut j Juglans spp. walnut aphid j Chromaphis juglandicola This study was designed to evaluate the efficacy of reduced-risk insecti- Prior to application, there was no significant difference in aphid cides for control of WA. This study was conducted in mature populations among experimental treatments, with a range from “Chandler” walnut orchard spaced with 4.9 m between trees and 6.7 m 0.73 to 2.08 aphids per leaflet (Table 1). At 3 DAA, all experimental between rows near Tracy, CA. Thirteen treatments were replicated four treatments had significantly lower WA compared to the untreated times in an RCB design. Each replicate was a single tree with an un- check with Bexar, the low rate of Belay and Exirel having numeric- treated buffer tree in all directions from a treated tree. Materials were ally higher WA population compared to all other experimental applied using a hand-held orchard sprayer operating at 2,068 kPa with treatments. At 7 DAA, all experimental treatments maintained sig- a finished spray volume of 1,870.8 liters/ha. A single application was nificantly lower WA compared to the untreated check. Between 3 applied on 9 Jun. WA were monitored by visual examination of 10 ran- and 7 DAA, air temperatures ranged from 40.5 to 43.9 C resulting domly selected sub-terminal leaflets per replicate 1 day prior to applica- in a reduced WA population at 7 DAA. At 14 DAA, there was no tion and at 3, 7, and 14 d after application (DAA). Data were analyzed significant difference among the treatments and the trial was using ANOVA with mean separation using Fisher’s LSD (P  0.05). terminated. Table 1 Mean number walnut aphids per leaflet Treatment Rate form/ha 8 Jun 2015 12 Jun 2015 16 Jun 2015 23 Jun 2015 Exirel 10SE 738.3 ml 0.90 a 0.28 bc 0.08 b 0.08 a Exirel 10SE 986.9 ml 1.00 a 0.33 bc 0.03 b 0.10 a Exirel 10SE 1,498.6 ml 0.83 a 0.50 b 0.13 b 0.15 a Belay 2.13SC 219.3 ml 1.13 a 0.35 bc 0.13 b 0.48 a Belay 2.13SC 438.6 ml 1.33 a 0.03 c 0.15 b 0.93 a Bexar 15SC 1,973.7 ml 0.73 a 0.25 bc 0.10 b 0.28 a Beleaf 50SG 196.1 g 1.40 a 0.08 c 0.08 b 0.05 a Beleaf 50SG 294.2 g 1.03 a 0.08 c 0.03 b 0.05 a Sivanto 1.67SL 877.2 ml 1.03 a 0.03 c 0.03 b 0.00 a Sequoia 2SC 365.5 ml 0.75 a 0.05 c 0.03 b 0.05 a Assail 30SG 420.3 g 1.38 a 0.08 c 0.00 b 0.08 a Admire Pro 153.5 ml 1.50 a 0.15 c 0.00 b 0.00 a Untreated check — 2.08 a 2.25 a 0.60 a 1.25 a Means followed by the same letter within a column are not significantly different (Fisher’s protected LSD, P< 0.05). Treatments included 0.0625% v/v Dyne-Amic. * This research was supported by industry gifts of pesticides and research funding. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial 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 journals.permissions@oup.com http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Control of Walnut Aphid in Walnuts, 2015 *

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© The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America.
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10.1093/amt/tsw034
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Abstract

Arthropod Management Tests, 2016, 1–1 doi: 10.1093/amt/tsw034 Section D: Citrus, Nuts, and Other Tree Fruits WALNUT: Juglans regia L., ‘Chandler’ 1,2 3 4 Robert A. Van Steenwyk, Alyssa M. Hernandez, Ruth A. Poliakon, and Benjamin J. Wong Department of E.S.P.M., 130 Mulford Hall – 3114, University of California, Berkeley, CA 94720-3114, Phone: (510) 643-5159, Fax: (510) 643-5438 (bobvanst@berkeley.edu), Corresponding author, e-mail: bobvanst@berkeley.edu, 3 4 Harvard University, 26 Oxford St., Cambridge, MA 02138, (ahernandez@g.harvard.edu), (poliakon@berkeley.edu), and (benjwong@berkeley.edu) Subject Editor: David Haviland walnut j Juglans spp. walnut aphid j Chromaphis juglandicola This study was designed to evaluate the efficacy of reduced-risk insecti- Prior to application, there was no significant difference in aphid cides for control of WA. This study was conducted in mature populations among experimental treatments, with a range from “Chandler” walnut orchard spaced with 4.9 m between trees and 6.7 m 0.73 to 2.08 aphids per leaflet (Table 1). At 3 DAA, all experimental between rows near Tracy, CA. Thirteen treatments were replicated four treatments had significantly lower WA compared to the untreated times in an RCB design. Each replicate was a single tree with an un- check with Bexar, the low rate of Belay and Exirel having numeric- treated buffer tree in all directions from a treated tree. Materials were ally higher WA population compared to all other experimental applied using a hand-held orchard sprayer operating at 2,068 kPa with treatments. At 7 DAA, all experimental treatments maintained sig- a finished spray volume of 1,870.8 liters/ha. A single application was nificantly lower WA compared to the untreated check. Between 3 applied on 9 Jun. WA were monitored by visual examination of 10 ran- and 7 DAA, air temperatures ranged from 40.5 to 43.9 C resulting domly selected sub-terminal leaflets per replicate 1 day prior to applica- in a reduced WA population at 7 DAA. At 14 DAA, there was no tion and at 3, 7, and 14 d after application (DAA). Data were analyzed significant difference among the treatments and the trial was using ANOVA with mean separation using Fisher’s LSD (P  0.05). terminated. Table 1 Mean number walnut aphids per leaflet Treatment Rate form/ha 8 Jun 2015 12 Jun 2015 16 Jun 2015 23 Jun 2015 Exirel 10SE 738.3 ml 0.90 a 0.28 bc 0.08 b 0.08 a Exirel 10SE 986.9 ml 1.00 a 0.33 bc 0.03 b 0.10 a Exirel 10SE 1,498.6 ml 0.83 a 0.50 b 0.13 b 0.15 a Belay 2.13SC 219.3 ml 1.13 a 0.35 bc 0.13 b 0.48 a Belay 2.13SC 438.6 ml 1.33 a 0.03 c 0.15 b 0.93 a Bexar 15SC 1,973.7 ml 0.73 a 0.25 bc 0.10 b 0.28 a Beleaf 50SG 196.1 g 1.40 a 0.08 c 0.08 b 0.05 a Beleaf 50SG 294.2 g 1.03 a 0.08 c 0.03 b 0.05 a Sivanto 1.67SL 877.2 ml 1.03 a 0.03 c 0.03 b 0.00 a Sequoia 2SC 365.5 ml 0.75 a 0.05 c 0.03 b 0.05 a Assail 30SG 420.3 g 1.38 a 0.08 c 0.00 b 0.08 a Admire Pro 153.5 ml 1.50 a 0.15 c 0.00 b 0.00 a Untreated check — 2.08 a 2.25 a 0.60 a 1.25 a Means followed by the same letter within a column are not significantly different (Fisher’s protected LSD, P< 0.05). Treatments included 0.0625% v/v Dyne-Amic. * This research was supported by industry gifts of pesticides and research funding. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial 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 journals.permissions@oup.com

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2016

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