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BLUEBERRY THRIPS CONTROL, 2006

BLUEBERRY THRIPS CONTROL, 2006 (C5) BLUEBERRY: Vaccinium angustifolium Aiton, ‘lowbush’ 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 Dept. of Biological Sciences 5722 Deering Hall University of Maine Orono, ME 04469 Phone: (207) 581-2989 Fax: (207) 581-2969 Email: Frank.Drummond@umit.maine.edu Blueberry thrips (BT): Frankliniella vaccinii Morgan and Catinathrips kainos O’Neill Materials were applied to 7 x 25 ft plots in a vegetative-year blueberry field at Harrington, Maine. There were four treated plots for each material plus four untreated check plots. All materials were applied in 25 gal of water-mixture per acre using a CO -propelled 80-inch boom sprayer (76-inch swath), with four, flat spray 8002VS TeeJet nozzles operating at 35 psi. Admire Pro (7.0 oz) and Provado Pro (16.0 oz) were applied to the soil on 15 May prior to blueberry plant emergence. Assail 30 SG (5.3 oz) was applied on 23 May when blueberry stems were 0.25-0.50 inches tall and again on 30 May when blueberry stems were 1.0 to 1.5 inches tall. On 6 Jun, the number of blueberry stems with and without thrips damage as evidence by curled leaves was determined from each of four, square foot samples per plot. Blueberry stems were 2 to 4 inches tall. No symptoms of phytotoxicity were apparent in any of the plots. Data for stem density were analyzed by ANOVA and means were separated using SNK (P < 0.05). Subplots were pooled within main plots. There was no significant difference in stem density among treatments (P = 0.7696) (Table 1). Data for percent stems with thrips curls was transformed by arcsine to stabilize variance prior to analysis and ANOVA and LS Means Differences Tukey’s HSD (P < 0.05) were used to compare average percent stems with thrips curls among the treatments. The pre-emergence application of Admire Pro resulted in a 75% reduction in the average percent stems with thrips curls. An 87% reduction was obtained with Provado Pro (Table 1). The results were significant (P = 0.0008). There were also significantly fewer percent stems with thrips curls in the plots treated with two applications of Assail 30 SG (3.5%) than in the untreated check plots (25.4%), which was an 86% reduction. Rate Avg. number Avg. % stems with 2 2 Treatment/formulation Amt. product/acre stems/ft curls/ft Admire Pro (pre-emergence) 7.0 oz 70.6a 6.3b Assail 30 SG 5.3 oz 79.2a 3.5b Provado Pro (pre-emergence) 16.0 oz 83.7a 3.4b Untreated check - 86.0a 25.4a Means within each column followed by the same letter are not significantly different. Data for average number of stems per ft was separated by SNK, P < 0.05. Data for average percent stems with curls was transformed by arcsine due to unequal variances and separated by LS Means Differences Tukey’s HSD, P < 0.05. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

BLUEBERRY THRIPS CONTROL, 2006

Collins, J. A.; Drummond, F. A.
Arthropod Management Tests , Volume 32 (1) – Jan 1, 2007
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Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/32.1.C5
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Abstract

(C5) BLUEBERRY: Vaccinium angustifolium Aiton, ‘lowbush’ 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 Dept. of Biological Sciences 5722 Deering Hall University of Maine Orono, ME 04469 Phone: (207) 581-2989 Fax: (207) 581-2969 Email: Frank.Drummond@umit.maine.edu Blueberry thrips (BT): Frankliniella vaccinii Morgan and Catinathrips kainos O’Neill Materials were applied to 7 x 25 ft plots in a vegetative-year blueberry field at Harrington, Maine. There were four treated plots for each material plus four untreated check plots. All materials were applied in 25 gal of water-mixture per acre using a CO -propelled 80-inch boom sprayer (76-inch swath), with four, flat spray 8002VS TeeJet nozzles operating at 35 psi. Admire Pro (7.0 oz) and Provado Pro (16.0 oz) were applied to the soil on 15 May prior to blueberry plant emergence. Assail 30 SG (5.3 oz) was applied on 23 May when blueberry stems were 0.25-0.50 inches tall and again on 30 May when blueberry stems were 1.0 to 1.5 inches tall. On 6 Jun, the number of blueberry stems with and without thrips damage as evidence by curled leaves was determined from each of four, square foot samples per plot. Blueberry stems were 2 to 4 inches tall. No symptoms of phytotoxicity were apparent in any of the plots. Data for stem density were analyzed by ANOVA and means were separated using SNK (P < 0.05). Subplots were pooled within main plots. There was no significant difference in stem density among treatments (P = 0.7696) (Table 1). Data for percent stems with thrips curls was transformed by arcsine to stabilize variance prior to analysis and ANOVA and LS Means Differences Tukey’s HSD (P < 0.05) were used to compare average percent stems with thrips curls among the treatments. The pre-emergence application of Admire Pro resulted in a 75% reduction in the average percent stems with thrips curls. An 87% reduction was obtained with Provado Pro (Table 1). The results were significant (P = 0.0008). There were also significantly fewer percent stems with thrips curls in the plots treated with two applications of Assail 30 SG (3.5%) than in the untreated check plots (25.4%), which was an 86% reduction. Rate Avg. number Avg. % stems with 2 2 Treatment/formulation Amt. product/acre stems/ft curls/ft Admire Pro (pre-emergence) 7.0 oz 70.6a 6.3b Assail 30 SG 5.3 oz 79.2a 3.5b Provado Pro (pre-emergence) 16.0 oz 83.7a 3.4b Untreated check - 86.0a 25.4a Means within each column followed by the same letter are not significantly different. Data for average number of stems per ft was separated by SNK, P < 0.05. Data for average percent stems with curls was transformed by arcsine due to unequal variances and separated by LS Means Differences Tukey’s HSD, P < 0.05.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2007

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