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CONTROL OF BLUEBERRY MAGGOT, 2006

CONTROL OF BLUEBERRY MAGGOT, 2006 (C8) BLUEBERRY: Vaccinium corymbosum L. ‘Jersey’ John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 (517) 432-2668 tel (517) 353-5598 fax E-mail: wisejohn@msu.edu Kevin Schoenborn E-mail: schoenb6@msu.edu Rufus Isaacs E-mail: isaacsr@msu.edu Blueberry maggot (BM): Rhagoletis mendax Curran This trial was designed to help determine effective rates and timings of various insecticides for control of BM in Michigan. The insecticides were applied to mature ‘Jersey’ blueberry bushes (Felker Blueberries) near the Trevor Nichols Research Complex in Fennville, MI with an FMC 1029 tractor-mounted airblast plot sprayer calibrated to deliver 50 gpa at 2.5 mph. All plots consisted of single 24 ft long rows of bushes (4 bushes per plot) and were arranged in a RCB design with four replications. Bushes were spaced 6 x 12 ft apart and all plots were separated by at least one buffer row. In addition to using buffers to minimize drift, a cardboard ‘donut’ was placed over the fan on the airblast to reduce airflow. No maintenance pesticides were applied to the test plots during the trial. Applications of test materials were initiated seven days after the first sustained flight of BM and were made on a 14 d interval on 28 Jun, 12 Jul, and 26 Jul (see data table). In order to accurately evaluate BM infestation, approximately 0.75 lb of berries were picked at random on four separate dates on 25 Jul, 28 Jul, 31 Jul, and 4 Aug for a total sample weight of approximately 3 lb per plot (~ 2700 blueberries). The samples were placed on quarter inch hardware cloth in 6-qt plastic boxes and larvae were allowed to drop out of the blueberries into a 1 inch layer of sand. After incubating the samples at ambient temp, the sand was screened for the presence of BM pupae on 28 Aug by sifting it through window screen. Data are presented as the mean number of pupae per lb, and % control. Mean treated plot control plot percent control was calculated using Abbott’s formula; [1 – (n / n )]*100, and all data were analyzed using ANOVA and means separation by Duncan’s New MRT at P = 0.05. All treatment compounds significantly reduced the emergence of BM pupae compared to the untreated check, Assail, Imidan and Actara showing the best activity (Table 1). Assail and Imidan were the only compounds providing % Control levels above 90%. BM pupae - 5 Aug Treatment/ Rate Application a c d e formulation amt product/acre timing number / lb % control Untreated 52.5a 0 Imidan 70W + 1.33 lb ABC 3.8de 93.1ab Tri-Fol .05 pt/100 gal ABC Delegate 25WG 4.5 oz ABC 12.7c 78.3b Actara 25WG 4.5 oz ABC 7.8cde 87.2ab Capture 2EC 3.2 fl oz ABC 24.4b 53.9c Provado Pro 1.6SC 6 fl oz ABC 9.4cd 84.8b Assail 30DG 5 oz ABC 2.2e 97.3a Means followed by same letter do not significantly differ (P = 0.05, Duncan’s New MRT) A = 28 Jun; B = 12 Jul; C = 26 Jul Fruit harvested in late Jul; pupae collected on 28 Aug ANOVA performed on square-root transformed data d treated plot control plot % control calculated using Abbott’s formula [1 – (n / n )]*100 ANOVA performed on arcsine square-root transformed data; untreated excluded from statistical analysis http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF BLUEBERRY MAGGOT, 2006

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/32.1.C8
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Abstract

(C8) BLUEBERRY: Vaccinium corymbosum L. ‘Jersey’ John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 (517) 432-2668 tel (517) 353-5598 fax E-mail: wisejohn@msu.edu Kevin Schoenborn E-mail: schoenb6@msu.edu Rufus Isaacs E-mail: isaacsr@msu.edu Blueberry maggot (BM): Rhagoletis mendax Curran This trial was designed to help determine effective rates and timings of various insecticides for control of BM in Michigan. The insecticides were applied to mature ‘Jersey’ blueberry bushes (Felker Blueberries) near the Trevor Nichols Research Complex in Fennville, MI with an FMC 1029 tractor-mounted airblast plot sprayer calibrated to deliver 50 gpa at 2.5 mph. All plots consisted of single 24 ft long rows of bushes (4 bushes per plot) and were arranged in a RCB design with four replications. Bushes were spaced 6 x 12 ft apart and all plots were separated by at least one buffer row. In addition to using buffers to minimize drift, a cardboard ‘donut’ was placed over the fan on the airblast to reduce airflow. No maintenance pesticides were applied to the test plots during the trial. Applications of test materials were initiated seven days after the first sustained flight of BM and were made on a 14 d interval on 28 Jun, 12 Jul, and 26 Jul (see data table). In order to accurately evaluate BM infestation, approximately 0.75 lb of berries were picked at random on four separate dates on 25 Jul, 28 Jul, 31 Jul, and 4 Aug for a total sample weight of approximately 3 lb per plot (~ 2700 blueberries). The samples were placed on quarter inch hardware cloth in 6-qt plastic boxes and larvae were allowed to drop out of the blueberries into a 1 inch layer of sand. After incubating the samples at ambient temp, the sand was screened for the presence of BM pupae on 28 Aug by sifting it through window screen. Data are presented as the mean number of pupae per lb, and % control. Mean treated plot control plot percent control was calculated using Abbott’s formula; [1 – (n / n )]*100, and all data were analyzed using ANOVA and means separation by Duncan’s New MRT at P = 0.05. All treatment compounds significantly reduced the emergence of BM pupae compared to the untreated check, Assail, Imidan and Actara showing the best activity (Table 1). Assail and Imidan were the only compounds providing % Control levels above 90%. BM pupae - 5 Aug Treatment/ Rate Application a c d e formulation amt product/acre timing number / lb % control Untreated 52.5a 0 Imidan 70W + 1.33 lb ABC 3.8de 93.1ab Tri-Fol .05 pt/100 gal ABC Delegate 25WG 4.5 oz ABC 12.7c 78.3b Actara 25WG 4.5 oz ABC 7.8cde 87.2ab Capture 2EC 3.2 fl oz ABC 24.4b 53.9c Provado Pro 1.6SC 6 fl oz ABC 9.4cd 84.8b Assail 30DG 5 oz ABC 2.2e 97.3a Means followed by same letter do not significantly differ (P = 0.05, Duncan’s New MRT) A = 28 Jun; B = 12 Jul; C = 26 Jul Fruit harvested in late Jul; pupae collected on 28 Aug ANOVA performed on square-root transformed data d treated plot control plot % control calculated using Abbott’s formula [1 – (n / n )]*100 ANOVA performed on arcsine square-root transformed data; untreated excluded from statistical analysis

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2007

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