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CRANBERRY FRUITWORM CONTROL IN MASSACHUSETTS CRANBERRY, 2001

CRANBERRY FRUITWORM CONTROL IN MASSACHUSETTS CRANBERRY, 2001 (C10) CRANBERRY: Vaccinium macrocarpon (Aiton), 'Early Black' Donald C. Weber Ocean Spray Cranberries Agricultural Science Group USDA-ARS Insect Biocontrol Laboratory Building 011A, Room 107, BARC-West Beltsville, MD 20705 Phone: (301) 504-8369 Fax: (301) 504-5104 E-mail: bogbug@aol.com Cranberry fruitworm (CF): Acrobasis vaccinii Riley Ten treatments and two untreated checks were evaluated in a 0.73-acre commercial cranberry bog ('Early Black') in Wareham, MA. Sixty 4-m plots in five blocks were established and treatments were randomly assigned to the plots within each block. According to standard cranberry fruitworm control protocols, application timings corresponded to the crop-based biofix of 50% out-of-bloom (50% OOB, defined as the time at which half of the flowers that have lost all petals or become fruits, as a percentage of all flower buds, flowers, and forming fruits). For 'Early Black', 7-9 days after 50% OOB is recommended for first application, and a second application is applied at 18 days after 50% OOB, 10 days after the first treatment. The second fruitworm application typically suppresses Sparganothis fruitworm fruit infestation. Our protocols were timed for CF management, and not specifically for Sparganothis. The CF standard 2-application protocol was followed for the Confirm, Intrepid (both rates), SpinTor, Diazinon, Avaunt, Calypso, Confirm, and SpinTor treatments. Mattch, Trilogy 70 EC, and Essential Oil 2- 4-72 had 3-application treatments timed with identical initial and final applications, but also at 5 days after the first application, for a total of three applications instead of the usual two. Materials were applied in water with no additional surfactants or adjuvants in 100 gpa with a stainless-steel CO pressurized backpack sprayer at 40 psi. The first application was done on 6 Jul, 8 days after the sites reached 50% OOB. Efficacy of the treatments was measured as a proportion of fruit damaged by the pest. All fruit was removed from the sample plot using a hand cranberry scoop on 7 Aug, and returned to the laboratory for inspection. Approximately 300 g of fruit was randomly subsampled from each plot, and all of these fruit (450 minimum per plot) were assessed for Cf, Sparganothis, and other damage. We tested differences between the treatments using a Bonferroni corrected chi-square test. For CF control, diazinon (the grower standard) and both rates of methoxyfenozide provided comparable and superior control with the conventional timing used. Avaunt also provided >50% reduction in fruitworm damage. Confirm and SpinTor, although significantly reducing damage compared with untreated controls, reduced fruitworm damage by less than one-third under conditions of this trial. The remaining treatments did not differ significantly from untreated checks, and water application did not influence damage between untreated checks. Sparganothis damage averaged 1.6% and was not significantly different for all treatments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CRANBERRY FRUITWORM CONTROL IN MASSACHUSETTS CRANBERRY, 2001

Arthropod Management Tests , Volume 27 (1) – Jan 1, 2002

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Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/27.1.C10
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Abstract

(C10) CRANBERRY: Vaccinium macrocarpon (Aiton), 'Early Black' Donald C. Weber Ocean Spray Cranberries Agricultural Science Group USDA-ARS Insect Biocontrol Laboratory Building 011A, Room 107, BARC-West Beltsville, MD 20705 Phone: (301) 504-8369 Fax: (301) 504-5104 E-mail: bogbug@aol.com Cranberry fruitworm (CF): Acrobasis vaccinii Riley Ten treatments and two untreated checks were evaluated in a 0.73-acre commercial cranberry bog ('Early Black') in Wareham, MA. Sixty 4-m plots in five blocks were established and treatments were randomly assigned to the plots within each block. According to standard cranberry fruitworm control protocols, application timings corresponded to the crop-based biofix of 50% out-of-bloom (50% OOB, defined as the time at which half of the flowers that have lost all petals or become fruits, as a percentage of all flower buds, flowers, and forming fruits). For 'Early Black', 7-9 days after 50% OOB is recommended for first application, and a second application is applied at 18 days after 50% OOB, 10 days after the first treatment. The second fruitworm application typically suppresses Sparganothis fruitworm fruit infestation. Our protocols were timed for CF management, and not specifically for Sparganothis. The CF standard 2-application protocol was followed for the Confirm, Intrepid (both rates), SpinTor, Diazinon, Avaunt, Calypso, Confirm, and SpinTor treatments. Mattch, Trilogy 70 EC, and Essential Oil 2- 4-72 had 3-application treatments timed with identical initial and final applications, but also at 5 days after the first application, for a total of three applications instead of the usual two. Materials were applied in water with no additional surfactants or adjuvants in 100 gpa with a stainless-steel CO pressurized backpack sprayer at 40 psi. The first application was done on 6 Jul, 8 days after the sites reached 50% OOB. Efficacy of the treatments was measured as a proportion of fruit damaged by the pest. All fruit was removed from the sample plot using a hand cranberry scoop on 7 Aug, and returned to the laboratory for inspection. Approximately 300 g of fruit was randomly subsampled from each plot, and all of these fruit (450 minimum per plot) were assessed for Cf, Sparganothis, and other damage. We tested differences between the treatments using a Bonferroni corrected chi-square test. For CF control, diazinon (the grower standard) and both rates of methoxyfenozide provided comparable and superior control with the conventional timing used. Avaunt also provided >50% reduction in fruitworm damage. Confirm and SpinTor, although significantly reducing damage compared with untreated controls, reduced fruitworm damage by less than one-third under conditions of this trial. The remaining treatments did not differ significantly from untreated checks, and water application did not influence damage between untreated checks. Sparganothis damage averaged 1.6% and was not significantly different for all treatments.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2002

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