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BLUEBERRY FLEA BEETLE ADULT CONTROL IN THE LABORATORY, 2006

BLUEBERRY FLEA BEETLE ADULT CONTROL IN THE LABORATORY, 2006 (L2) BLUEBERRY: Vaccinium angustifolium Aiton, 'lowbush blueberry' J. A. Collins Dept. of Biological Sciences 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 Email: Frank.Drummond@umit.maine.edu Blueberry flea beetle (FB): Altica sylvia Malloch This experiment was conducted in a vegetative-year lowbush blueberry field located at Blueberry Hill Farm Experiment Station in Jonesboro, Maine. Treatments were applied on 28 Jun (trial #1) or 11 Jul (trial #2) in 25 gallons of water-mixture per acre with a CO -propelled, 80-inch boom sprayer (76-inch swath) equipped with four, flat-spray 8002VS TeeJet nozzles operating at 35 psi and at a slow walking speed. Speed was regulated using a metronome. The materials were allowed to dry on the foliage. Field-collected, FB adults were placed in 3.5-inch diameter plastic cups with Petri dish lids. There were four replications of five FB each. One treated stem with foliage was cut and placed in each cup. The cups were held at room temperature and assessed for mortality at daily intervals for five days. Untreated blueberry foliage was added in successive days during the experiment to each cup as needed. The Product-Limit Survival (Kaplan-Meier) Method and Gehan-Wilcoxon Mean Separation (P ≤ 0.05) were used to compare the mean days to death of each treatment to the untreated check. Logistic Regression was used to compare percent survival among the treatments. All four materials provided excellent control of FB adults. Mean days to death of each treatment was significantly different from the untreated check in both trials (Table 1). Assail 30 SG and Avaunt 30 WG took 1-2 days longer to reduce the populations to negligible levels compared to SpinTor 2 SC and Imidan 70 WP (Table 2). These later insecticides appear to reduce populations almost immediately after application of the insecticides to blueberry foliage. Table 1 Treatment/ Rate Mean a 2 c formulation amt. product/acre days to death Prob X ≤ 0.05 Trial #1 Assail 30 SG 5.3 oz 1.0 < 0.0001 Avaunt 30 WG 6.0 oz 1.0 < 0.0001 Imidan 70 WP 21.3 oz 1.0 < 0.0001 SpinTor 2 SC 6.0 oz 1.0 < 0.0001 Untreated check --- ** NA Trial #2 Avaunt 30 WG 4.0 oz 1.0 < 0.0001 Avaunt 30 WG 6.0 oz 1.0 < 0.0001 SpinTor 2 SC 6.0 oz 1.0 < 0.0001 Untreated check --- ** NA Biased estimate due to censored observations (live larvae) at end of study. Not possible to estimate because of > 50% survival. Pair-wise comparison with untreated check. NA - Not applicable. Table 2 % survival on day after application Treatment/ Rate formulation amt. product/acre 1 2 3 4 5 Trial #1 Assail 30 SG 5.3 oz 0.0c 0.0c 0.0b 0.0b 0.0b Avaunt 30 WG 6.0 oz 50.0b 30.0b 10.0b 5.0b 5.0b Imidan 70 WP 21.3 oz 0.0c 0.0c 0.0b 0.0b 0.0b SpinTor 2 SC 6.0 oz 45.0b 20.0b 10.0b 0.0b 0.0b Untreated check --- 100.0a 100.0a 100.0a 100.0a 98.8a Trial #2 Avaunt 30 WG 4.0 oz 30.0c 0.0c 0.0b 0.0b 0.0b Avaunt 30 WG 6.0 oz 5.0b 0.0c 0.0b 0.0b 0.0b SpinTor 2 SC 6.0 oz 40.0c 35.0b 10.0b 5.0b 0.0b Untreated check --- 100.0a 100.0a 100.0a 100.0a 97.5a Mean percent survival within each sample day and trial followed by the same letter are not significantly different (Logistic Regression, P ≤ 0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

BLUEBERRY FLEA BEETLE ADULT CONTROL IN THE LABORATORY, 2006

Arthropod Management Tests , Volume 32 (1) – Jan 1, 2007

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/32.1.L2
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Abstract

(L2) BLUEBERRY: Vaccinium angustifolium Aiton, 'lowbush blueberry' J. A. Collins Dept. of Biological Sciences 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 Email: Frank.Drummond@umit.maine.edu Blueberry flea beetle (FB): Altica sylvia Malloch This experiment was conducted in a vegetative-year lowbush blueberry field located at Blueberry Hill Farm Experiment Station in Jonesboro, Maine. Treatments were applied on 28 Jun (trial #1) or 11 Jul (trial #2) in 25 gallons of water-mixture per acre with a CO -propelled, 80-inch boom sprayer (76-inch swath) equipped with four, flat-spray 8002VS TeeJet nozzles operating at 35 psi and at a slow walking speed. Speed was regulated using a metronome. The materials were allowed to dry on the foliage. Field-collected, FB adults were placed in 3.5-inch diameter plastic cups with Petri dish lids. There were four replications of five FB each. One treated stem with foliage was cut and placed in each cup. The cups were held at room temperature and assessed for mortality at daily intervals for five days. Untreated blueberry foliage was added in successive days during the experiment to each cup as needed. The Product-Limit Survival (Kaplan-Meier) Method and Gehan-Wilcoxon Mean Separation (P ≤ 0.05) were used to compare the mean days to death of each treatment to the untreated check. Logistic Regression was used to compare percent survival among the treatments. All four materials provided excellent control of FB adults. Mean days to death of each treatment was significantly different from the untreated check in both trials (Table 1). Assail 30 SG and Avaunt 30 WG took 1-2 days longer to reduce the populations to negligible levels compared to SpinTor 2 SC and Imidan 70 WP (Table 2). These later insecticides appear to reduce populations almost immediately after application of the insecticides to blueberry foliage. Table 1 Treatment/ Rate Mean a 2 c formulation amt. product/acre days to death Prob X ≤ 0.05 Trial #1 Assail 30 SG 5.3 oz 1.0 < 0.0001 Avaunt 30 WG 6.0 oz 1.0 < 0.0001 Imidan 70 WP 21.3 oz 1.0 < 0.0001 SpinTor 2 SC 6.0 oz 1.0 < 0.0001 Untreated check --- ** NA Trial #2 Avaunt 30 WG 4.0 oz 1.0 < 0.0001 Avaunt 30 WG 6.0 oz 1.0 < 0.0001 SpinTor 2 SC 6.0 oz 1.0 < 0.0001 Untreated check --- ** NA Biased estimate due to censored observations (live larvae) at end of study. Not possible to estimate because of > 50% survival. Pair-wise comparison with untreated check. NA - Not applicable. Table 2 % survival on day after application Treatment/ Rate formulation amt. product/acre 1 2 3 4 5 Trial #1 Assail 30 SG 5.3 oz 0.0c 0.0c 0.0b 0.0b 0.0b Avaunt 30 WG 6.0 oz 50.0b 30.0b 10.0b 5.0b 5.0b Imidan 70 WP 21.3 oz 0.0c 0.0c 0.0b 0.0b 0.0b SpinTor 2 SC 6.0 oz 45.0b 20.0b 10.0b 0.0b 0.0b Untreated check --- 100.0a 100.0a 100.0a 100.0a 98.8a Trial #2 Avaunt 30 WG 4.0 oz 30.0c 0.0c 0.0b 0.0b 0.0b Avaunt 30 WG 6.0 oz 5.0b 0.0c 0.0b 0.0b 0.0b SpinTor 2 SC 6.0 oz 40.0c 35.0b 10.0b 5.0b 0.0b Untreated check --- 100.0a 100.0a 100.0a 100.0a 97.5a Mean percent survival within each sample day and trial followed by the same letter are not significantly different (Logistic Regression, P ≤ 0.05).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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