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BLUEBERRY SPANWORM CONTROL, 2011

BLUEBERRY SPANWORM CONTROL, 2011 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.C4 (C4) BLUEBERRY: Vaccinium angustifolium Aiton, 'lowbush' J. A. Collins School of Biology and Ecology 5722 Deering Hall University of Maine Orono, ME 04469 Phone: (207) 581-2868 Fax: (207) 581-2969 E-mail: Judith.Collins@umit.maine.edu F. A. Drummond Phone: (207) 581-2989 Fax: (207) 581-2969 Email: Frank.Drummond@umit.maine.edu Blueberry spanworm (SW): Itame argillacearia (Packard) This experiment was conducted on lowbush blueberry to evaluate the effectiveness of four insecticides against blueberry spanworm (SW). Materials were applied on 12 May to 20 × 20-ft plots in a fruit-bearing blueberry field at Deblois, Maine. There were four replications of each treatment and a minimum 5-ft untreated buffer strip around each plot. Treatment formulations and rates are given in Table 1. Treatments were blocked according to prespray population levels. Insecticides were applied in 25 gpa of water using a CO -propelled, 80-inch boom sprayer (76-inch swath) equipped with four, flat spray 8002VS TeeJet nozzles operating at 35 psi. Speed was regulated using a metronome. SW larvae were first and second instar and blueberry plants were at the tight cluster bud stage. On sample dates indicated in the table, 10 sweeps with a standard 12-inch diameter sweep net were taken systematically through the center area of each plot avoiding plot boundaries. Any SW larvae were counted and then distributed back into the same plot. Weather was cool and wet during the trial. No phytotoxicity was observed to the plants. Data were analyzed using ANOVA (RCB) and means were separated using Tukey’s HSD (P < 0.05). Prespray populations were not significantly different (P = 0.436). All materials and rates were very effective in reducing populations of SW larvae. Although population numbers were slightly higher in plots treated with the reduced rates of Delegate 25WG (3.5 oz/acre) and Assail 30SG (2.6 oz/acre) compared to the full rates (7.0 and 5.3 oz/acre, respectively), both rates and materials provided excellent control and significantly reduced SW populations in comparison with the untreated checks. The insect growth regulators Confirm 2F and Intrepid 2F were also very effective. This research was supported by industry gift(s) of pesticides and/or research funding. Table 1. Number of spanworm larvae / 10 sweeps Treatment/ Rate formulation product/acre 12 May 13 May 14 May 18 May Assail 30SG 2.6 oz 8.0a 4.5b 3.8bc 3.0b Assail 30SG 5.3 oz 12.8a 0.8c 0.0d 0.5cd Confirm 2F 16.0 oz 12.8a 58.2b 1.5cd 0.0d Delegate 25WG 3.5 oz 9.5a 4.5b 4.5b 2.0bc Delegate 25WG 7.0 oz 11.2a 1.0c 0.0d 0.5cd Intrepid 2F 12.0 oz 13.2a 4.8b 1.2cd 0.0d Untreated check - 12.0a 11.8a 8.2a 5.0a Means within each column followed by the same letter(s) are not significantly different (P < 0.05, Tukey’s HSD). Prespray count. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

BLUEBERRY SPANWORM CONTROL, 2011

Collins, J. A.; Drummond, F. A.
Arthropod Management Tests , Volume 37 (1) – Jan 1, 2012
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Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.C4 (C4) BLUEBERRY: Vaccinium angustifolium Aiton, 'lowbush' J. A. Collins School of Biology and Ecology 5722 Deering Hall University of Maine Orono, ME 04469 Phone: (207) 581-2868 Fax: (207) 581-2969 E-mail: Judith.Collins@umit.maine.edu F. A. Drummond Phone: (207) 581-2989 Fax: (207) 581-2969 Email: Frank.Drummond@umit.maine.edu Blueberry spanworm (SW): Itame argillacearia (Packard) This experiment was conducted on lowbush blueberry to evaluate the effectiveness of four insecticides against blueberry spanworm (SW). Materials were applied on 12 May to 20 × 20-ft plots in a fruit-bearing blueberry field at Deblois, Maine. There were four replications of each treatment and a minimum 5-ft untreated buffer strip around each plot. Treatment formulations and rates are given in Table 1. Treatments were blocked according to prespray population levels. Insecticides were applied in 25 gpa of water using a CO -propelled, 80-inch boom sprayer (76-inch swath) equipped with four, flat spray 8002VS TeeJet nozzles operating at 35 psi. Speed was regulated using a metronome. SW larvae were first and second instar and blueberry plants were at the tight cluster bud stage. On sample dates indicated in the table, 10 sweeps with a standard 12-inch diameter sweep net were taken systematically through the center area of each plot avoiding plot boundaries. Any SW larvae were counted and then distributed back into the same plot. Weather was cool and wet during the trial. No phytotoxicity was observed to the plants. Data were analyzed using ANOVA (RCB) and means were separated using Tukey’s HSD (P < 0.05). Prespray populations were not significantly different (P = 0.436). All materials and rates were very effective in reducing populations of SW larvae. Although population numbers were slightly higher in plots treated with the reduced rates of Delegate 25WG (3.5 oz/acre) and Assail 30SG (2.6 oz/acre) compared to the full rates (7.0 and 5.3 oz/acre, respectively), both rates and materials provided excellent control and significantly reduced SW populations in comparison with the untreated checks. The insect growth regulators Confirm 2F and Intrepid 2F were also very effective. This research was supported by industry gift(s) of pesticides and/or research funding. Table 1. Number of spanworm larvae / 10 sweeps Treatment/ Rate formulation product/acre 12 May 13 May 14 May 18 May Assail 30SG 2.6 oz 8.0a 4.5b 3.8bc 3.0b Assail 30SG 5.3 oz 12.8a 0.8c 0.0d 0.5cd Confirm 2F 16.0 oz 12.8a 58.2b 1.5cd 0.0d Delegate 25WG 3.5 oz 9.5a 4.5b 4.5b 2.0bc Delegate 25WG 7.0 oz 11.2a 1.0c 0.0d 0.5cd Intrepid 2F 12.0 oz 13.2a 4.8b 1.2cd 0.0d Untreated check - 12.0a 11.8a 8.2a 5.0a Means within each column followed by the same letter(s) are not significantly different (P < 0.05, Tukey’s HSD). Prespray count.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2012

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