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CONTROL OF BLUEBERRY BUDMITE, 2004

CONTROL OF BLUEBERRY BUDMITE, 2004 (C13) BLUEBERRY: Vaccinium corymbosum L., 'Rubel' John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 Phone: (517) 432-2668 Fax: (517) 353-5598 E-mail: wisejohn@msu.edu Kevin Schoenborn E-mail: schoenb6@msu.edu Rufus Isaacs E-mail: isaacsr@msu.edu Blueberry budmite (BM): Acalitus vaccinii Riley This trial was designed to test some alternative materials and timings for control of a growing problem pest (in Michigan) of blueberries. The test was established in an 11-yr old 'Rubel' blueberry planting at the Trevor Nichols Research Complex in Fennville, MI. Four-bush plots were arranged in a RCB design with four replications, and treatments were blocked according to BM infestation levels. Bush spacing was 4 ×12 ft and all plots were separated by a minimum of one buffer row. In addition to using buffers to minimize drift, a donut shaped piece of cardboard was placed over the fan on the airblast to reduce airflow. All treatments were applied prior to bud break on 16 Apr with a tractor-mounted FMC 1029 airblast sprayer calibrated to deliver 50 gpa at 2.5 mph, and treatments 3 and 4 were also applied post-harvest on 9 Sep and 18 Sep. A maintenance application of Asana XL was applied to the entire test area on 22 Apr to control the predator mite, A. fallacis, and no other foliar maintenance pesticides were used during the duration of the trial. Evaluations of fruit buds were conducted on 15 Apr, 4 May, and 28 Sep by randomly selecting 10 shoots per replication and evaluating the buds for the presence of BM. The incidence of infestation of buds and shoots was recorded, and data are presented as the percentage of buds or shoots infested per treated plot control plot plot. Mean percent control data was calculated using Abbott’s formula; [1 – (n / n )]*100. Data were analyzed using ANOVA and means separation by Duncan’s New MRT at P ≤ 0.05. SUN Ultrafine oil was the only early-season treatment that provided control activity on the blueberry bud mite (Table 1). It may be that performance of the Sulfur materials and Diamond (Novaluron) would have been better if applied at a slightly later timing. In the post-harvest evaluations, however, Sulforix provided over 50% control of BM (Table 2). This control activity is likely related to the late summer pre-harvest applications. These applications also did not appear to cause any phytotoxicity to the blueberry plants, which, historically has been a concern for Sulfur products. These performance data will be important in supporting the expansion of the Sulforix label for in-season use in blueberries. Table 1. BM – % infestation pre-bloom 15 Apr 4 May Treatment/ Rate Application formulation amt product/acre timing fruit buds shoots fruit buds shoots Untreated --- --- 29.2a 50.0b 40.0a 70.0a Diamond 7.5WDG 40.0 oz A 39.2a 60.0ab 37.5a 67.5a Sulforix 1.0 gal ABC 37.5a 52.5ab 34.2a 67.5a Lime Sulfur 1.0 gal ABC 40.8a 67.5a 45.8a 72.5a Sun UFO 1.0 % v/v A 36.7a 57.5ab 35.8a 60.0a Means in a column followed by same letter do not significantly differ (P > 0.05, Duncan's New MRT). A = 16 Apr; B = 9 Aug; C = 18 Aug. Table 2. BM – infestation post-harvest % infestation Abbott’s % control 28 Sep 28 Sep Treatment/ Rate Application formulation amt product/acre timing fruit buds shoots fruit buds shoots Untreated check --- --- 44.2ab 70.0a 0.0b 0.0b Diamond 7.5WDG 40.0 oz A 56.7a 80.0a 13.4b 6.3b Sulforix 1.0 gal ABC 21.75b 35.0b 57.5a 50.0a Lime Sulfur 1.0 gal ABC 48.4ab 72.5a 6.7b 6.3b Sun UFO 1.0 % v/v A 45.9ab 72.5a 26.7b 16.1b Means followed by same letter do not significantly differ (P > 0.05, Duncan's New MRT). A = 16 Apr; B = 9 Aug; C = 18 Aug. b treated plot control plot Mean % control calculated using Abbott’s formula [1 – (n / n )]*100. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF BLUEBERRY BUDMITE, 2004

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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/30.1.C13
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Abstract

(C13) BLUEBERRY: Vaccinium corymbosum L., 'Rubel' John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 Phone: (517) 432-2668 Fax: (517) 353-5598 E-mail: wisejohn@msu.edu Kevin Schoenborn E-mail: schoenb6@msu.edu Rufus Isaacs E-mail: isaacsr@msu.edu Blueberry budmite (BM): Acalitus vaccinii Riley This trial was designed to test some alternative materials and timings for control of a growing problem pest (in Michigan) of blueberries. The test was established in an 11-yr old 'Rubel' blueberry planting at the Trevor Nichols Research Complex in Fennville, MI. Four-bush plots were arranged in a RCB design with four replications, and treatments were blocked according to BM infestation levels. Bush spacing was 4 ×12 ft and all plots were separated by a minimum of one buffer row. In addition to using buffers to minimize drift, a donut shaped piece of cardboard was placed over the fan on the airblast to reduce airflow. All treatments were applied prior to bud break on 16 Apr with a tractor-mounted FMC 1029 airblast sprayer calibrated to deliver 50 gpa at 2.5 mph, and treatments 3 and 4 were also applied post-harvest on 9 Sep and 18 Sep. A maintenance application of Asana XL was applied to the entire test area on 22 Apr to control the predator mite, A. fallacis, and no other foliar maintenance pesticides were used during the duration of the trial. Evaluations of fruit buds were conducted on 15 Apr, 4 May, and 28 Sep by randomly selecting 10 shoots per replication and evaluating the buds for the presence of BM. The incidence of infestation of buds and shoots was recorded, and data are presented as the percentage of buds or shoots infested per treated plot control plot plot. Mean percent control data was calculated using Abbott’s formula; [1 – (n / n )]*100. Data were analyzed using ANOVA and means separation by Duncan’s New MRT at P ≤ 0.05. SUN Ultrafine oil was the only early-season treatment that provided control activity on the blueberry bud mite (Table 1). It may be that performance of the Sulfur materials and Diamond (Novaluron) would have been better if applied at a slightly later timing. In the post-harvest evaluations, however, Sulforix provided over 50% control of BM (Table 2). This control activity is likely related to the late summer pre-harvest applications. These applications also did not appear to cause any phytotoxicity to the blueberry plants, which, historically has been a concern for Sulfur products. These performance data will be important in supporting the expansion of the Sulforix label for in-season use in blueberries. Table 1. BM – % infestation pre-bloom 15 Apr 4 May Treatment/ Rate Application formulation amt product/acre timing fruit buds shoots fruit buds shoots Untreated --- --- 29.2a 50.0b 40.0a 70.0a Diamond 7.5WDG 40.0 oz A 39.2a 60.0ab 37.5a 67.5a Sulforix 1.0 gal ABC 37.5a 52.5ab 34.2a 67.5a Lime Sulfur 1.0 gal ABC 40.8a 67.5a 45.8a 72.5a Sun UFO 1.0 % v/v A 36.7a 57.5ab 35.8a 60.0a Means in a column followed by same letter do not significantly differ (P > 0.05, Duncan's New MRT). A = 16 Apr; B = 9 Aug; C = 18 Aug. Table 2. BM – infestation post-harvest % infestation Abbott’s % control 28 Sep 28 Sep Treatment/ Rate Application formulation amt product/acre timing fruit buds shoots fruit buds shoots Untreated check --- --- 44.2ab 70.0a 0.0b 0.0b Diamond 7.5WDG 40.0 oz A 56.7a 80.0a 13.4b 6.3b Sulforix 1.0 gal ABC 21.75b 35.0b 57.5a 50.0a Lime Sulfur 1.0 gal ABC 48.4ab 72.5a 6.7b 6.3b Sun UFO 1.0 % v/v A 45.9ab 72.5a 26.7b 16.1b Means followed by same letter do not significantly differ (P > 0.05, Duncan's New MRT). A = 16 Apr; B = 9 Aug; C = 18 Aug. b treated plot control plot Mean % control calculated using Abbott’s formula [1 – (n / n )]*100.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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