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SOYBEAN APHID MANAGEMENT USING FOLIAR APPLIED INSECTICIDES IN SOUTH DAKOTA, 2011

SOYBEAN APHID MANAGEMENT USING FOLIAR APPLIED INSECTICIDES IN SOUTH DAKOTA, 2011 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F65 (F65) SOYBEAN: Glycine max L. Bradley L. McManus South Dakota State University 111 SNP, Univ. Box 2140-C Brookings, SD 57007 Phone (605) 690-4525 Fax: (605) 688-4452 E-mail: Bradley.McManus@sdstate.edu Billy W. Fuller E-mail: Billy.Fuller@sdstate.edu Soybean aphid: Aphis glycines Matsumura The Soybean aphid can pose a serious threat to soy, Glycine max L., production in South Dakota. An infestation of this pest at or above the 250 aphids per plant economic threshold warrants insecticide treatment to prevent potential yield loss. During the 2011 growing season, we conducted a field study near Volga, South Dakota using foliar applied insecticides for control of Soybean aphids when aphid numbers reached an average of 235 per plant at late R-3 to early R-4 soybean development stage. This study tested eleven different insecticides and rates for their effectiveness on controlling soybean aphids. The insecticide treatments were applied in 16 gallons per acre using a bicycle push sprayer. A control treatment was included to provide a base line for evaluating the insecticide’s effectiveness, knockdown time, and the duration of effectiveness. Experimental plots were arranged in an RCBD with four replications, of four rows (30 inch spacing) 36 feet in length. Yield evaluations were taken from the center 2 rows. Data analysis for the aphid whole plant counts and yield was analyzed using SAS PROC Mixed procedure with a macro created by Saxton for converting mean separation output to letter groupings in PROC Mixed. Transform and Leverage treatments had a higher numbers of aphids than the other insecticide treatments at 3DAT. th However by 7DAT all insecticide treatments had greatly reduced the number of aphids per plant. By 21DAT (August 25 ) the Leverage treatment aphid numbers had increased to 192 per plant. This was still under the threshold for soybean plants at the late R5 developmental stage. All treatments reduced the aphid numbers well below the Economic injury level after treatment and kept them below threshold throughout the 28 days following treatment. Treatment/ Rate, Yield formulation amt/A 0 DAT 3 DAT 7 DAT 14DAT 21DAT 28DAT bu/ha BaythroidXL + 2.0 fl oz Lorsban Adv. 8.0 fl oz 153.1b 1.3d 0.1c 6.9b 10.5d 17.4c 51.5a-c Cobalt Adv. 13.0 fl oz 275.0a 11.8d 6.6c 20.5b 21.4d 12.5c 47.5c EndigoZCX 3.5 fl oz 245.1ab 93.6b 45.2b 46.7b 194.0c 145.8b 48.8bc Fastac 4.0 fl oz 261.3a 4.2d 23.6bc 23.3b 42.8d 19.9c 54.5a Hero 5.1 fl oz 269.6a 3.3d 1.1c 1.8b 11.7d 12.6c 52.4ab Leverage360 2.8 fl oz 193.9ab 15.4d 8.2c 7.4b 14.7d 14.9c 53.1ab Lorsban Adv. 16.0 fl oz 279.1a 2.5d 0.0c 6.9b 22.1d 16.6c 50.5a-c Stallion 11.7 fl oz 279.4a 6.9d 1.0c 3.8b 18.3d 35.9c 52.1a-c Transform 0.71 oz 242.5ab 33.0cd 18.2bc 17.4b 26.4d 20.1c 49.6bc Transform 0.51 oz 223.8ab 84.7bc 17.0c 36.3b 40.6d 33.2c 50.5a-c Transform 0.43 oz 256.9ab 35.2cd 22.0bc 26.7b 75.8cd 27.6c 48.9bc Warrior II 1.28 fl oz 235.4ab 31.9cd 0.3c 7.8b 39.0d 12.8c 51.4a-c Warrior II 0.64 fl oz 241.3ab 24.4d 6.3c 4.2b 22.8d 33.9c 52.6ab Untreated NA 206.1ab 312.4a 206.9a 671.0a 1007.4a 206.2ab 37.5d Data analyzed using Means within columns followed by the same letter are not significantly (P = 0.05) different using SAS, version 9.2 PROC MIXED/PDIFF option with Saxton’s lettering macro. Aphid count mean for 3 plants from each of 4 replications (Date 0: P = 0.5202; Date 3: P < 0.0001; Date 7: P < 0.0001; Date 14: P < 0.0001; Date 21: P < 0.0001; Date 28: P < 0.0001) Yield data from 4 replications of 2 rows at 30 inch spacing by 32 foot of row length Yield: P < 0.0001 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

SOYBEAN APHID MANAGEMENT USING FOLIAR APPLIED INSECTICIDES IN SOUTH DAKOTA, 2011

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Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F65 (F65) SOYBEAN: Glycine max L. Bradley L. McManus South Dakota State University 111 SNP, Univ. Box 2140-C Brookings, SD 57007 Phone (605) 690-4525 Fax: (605) 688-4452 E-mail: Bradley.McManus@sdstate.edu Billy W. Fuller E-mail: Billy.Fuller@sdstate.edu Soybean aphid: Aphis glycines Matsumura The Soybean aphid can pose a serious threat to soy, Glycine max L., production in South Dakota. An infestation of this pest at or above the 250 aphids per plant economic threshold warrants insecticide treatment to prevent potential yield loss. During the 2011 growing season, we conducted a field study near Volga, South Dakota using foliar applied insecticides for control of Soybean aphids when aphid numbers reached an average of 235 per plant at late R-3 to early R-4 soybean development stage. This study tested eleven different insecticides and rates for their effectiveness on controlling soybean aphids. The insecticide treatments were applied in 16 gallons per acre using a bicycle push sprayer. A control treatment was included to provide a base line for evaluating the insecticide’s effectiveness, knockdown time, and the duration of effectiveness. Experimental plots were arranged in an RCBD with four replications, of four rows (30 inch spacing) 36 feet in length. Yield evaluations were taken from the center 2 rows. Data analysis for the aphid whole plant counts and yield was analyzed using SAS PROC Mixed procedure with a macro created by Saxton for converting mean separation output to letter groupings in PROC Mixed. Transform and Leverage treatments had a higher numbers of aphids than the other insecticide treatments at 3DAT. th However by 7DAT all insecticide treatments had greatly reduced the number of aphids per plant. By 21DAT (August 25 ) the Leverage treatment aphid numbers had increased to 192 per plant. This was still under the threshold for soybean plants at the late R5 developmental stage. All treatments reduced the aphid numbers well below the Economic injury level after treatment and kept them below threshold throughout the 28 days following treatment. Treatment/ Rate, Yield formulation amt/A 0 DAT 3 DAT 7 DAT 14DAT 21DAT 28DAT bu/ha BaythroidXL + 2.0 fl oz Lorsban Adv. 8.0 fl oz 153.1b 1.3d 0.1c 6.9b 10.5d 17.4c 51.5a-c Cobalt Adv. 13.0 fl oz 275.0a 11.8d 6.6c 20.5b 21.4d 12.5c 47.5c EndigoZCX 3.5 fl oz 245.1ab 93.6b 45.2b 46.7b 194.0c 145.8b 48.8bc Fastac 4.0 fl oz 261.3a 4.2d 23.6bc 23.3b 42.8d 19.9c 54.5a Hero 5.1 fl oz 269.6a 3.3d 1.1c 1.8b 11.7d 12.6c 52.4ab Leverage360 2.8 fl oz 193.9ab 15.4d 8.2c 7.4b 14.7d 14.9c 53.1ab Lorsban Adv. 16.0 fl oz 279.1a 2.5d 0.0c 6.9b 22.1d 16.6c 50.5a-c Stallion 11.7 fl oz 279.4a 6.9d 1.0c 3.8b 18.3d 35.9c 52.1a-c Transform 0.71 oz 242.5ab 33.0cd 18.2bc 17.4b 26.4d 20.1c 49.6bc Transform 0.51 oz 223.8ab 84.7bc 17.0c 36.3b 40.6d 33.2c 50.5a-c Transform 0.43 oz 256.9ab 35.2cd 22.0bc 26.7b 75.8cd 27.6c 48.9bc Warrior II 1.28 fl oz 235.4ab 31.9cd 0.3c 7.8b 39.0d 12.8c 51.4a-c Warrior II 0.64 fl oz 241.3ab 24.4d 6.3c 4.2b 22.8d 33.9c 52.6ab Untreated NA 206.1ab 312.4a 206.9a 671.0a 1007.4a 206.2ab 37.5d Data analyzed using Means within columns followed by the same letter are not significantly (P = 0.05) different using SAS, version 9.2 PROC MIXED/PDIFF option with Saxton’s lettering macro. Aphid count mean for 3 plants from each of 4 replications (Date 0: P = 0.5202; Date 3: P < 0.0001; Date 7: P < 0.0001; Date 14: P < 0.0001; Date 21: P < 0.0001; Date 28: P < 0.0001) Yield data from 4 replications of 2 rows at 30 inch spacing by 32 foot of row length Yield: P < 0.0001

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2013

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