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Spanworm Control, 1996A

Spanworm Control, 1996A Downloaded from https://academic.oup.com/amt/article-abstract/22/1/49/4639772 by DeepDyve user on 21 July 2020 C: SMALL FRUITS Arthropod Management Tests, Vol. 22 49 SMALL FRUITS BLUEBERRY: Vaccinium angustifolium Aiton 'lowbush' J.A.Collins, (1C) Blueberry spanworm; Itame argillacearia (Packard) F. A. Drummond Dept. of Applied Ecology and Environmental Sciences, University of Maine, Orono, M E 04469 (207)581-2960 SPANWORM CONTROL, 1996A: Materials were applied on 22 May to 20 by 20 ft plots in a bearing blueberry field at Jonesboro, Maine. There were 4 replications of each treatment and a minimum 5-ft untreated buffer strip around each plot. Treatments were blocked according to prespray popula­ tion levels. Insecticides were applied at a rate of 25 gpa using a C0 -propelled 40-inch boom sprayer with 4, flat spray, 800067 TeeJet nozzles operating at 35 psi (Test 1) or a C0 -propelled 80-inch boom sprayer with 4, flat spray, 80002VS TeeJet nozzles operating at 30 psi (Test 2). At treatment, larvae were first to third instar and plants were ca. 10% swollen bud, 40% tight cluster, 50% loose cluster. On sample dates indicated in table, 10 sweeps with a standard 12-inch sweep-net were taken systematically through the center area of each plot avoiding plot boundaries. The larvae were counted and then dis­ tributed back into the same plot. High winds on 27 and 28 May made sweep-net sampling difficult and may have confounded the results for those two dates. In Test 1, Imidan 2.5 EC provided excellent control of early instar spanworm larvae; 24 oz and 48 oz rates resulted in reductions which were not significantly different. Reduction in larval density with Imidan 50 W P was not significantly different from Imidan 2.5 EC; it also gave excellent control. Variation in the results between sample dates in Test 2 make it difficult to draw firm conclusions from the data. However, of the 3 formulations tested, Able and Javelin seemed to be effective compared with untreated check in respect of seasonal density. No phytotoxicity was apparent in any plot in either test. TEST1 Oz No. blueberry spanworm larvae/10 sweeps form./ Treatment acre 21 May* 23 May 24 May 26 May 27 May Imidan 2.5 EC 24 0.2b 18.5a 2.2b 0.2c 0.5b Imidan 2.5 EC 48 0.2b 21.0a 2.5b 0.0c 0.8b Imidan 50 W P 16 0.8b 19.2a 6.5b 1.2b 1.5b Untreated Check 5.0a 18.5a 25.0a 10.0a 7.8a Seasonal 28 May 31 May 3 Jun 6 Jun density Imidan 2.5 EC 24 1.0b 0.0b 0.2b 0.0b 0.4b Imidan 2.5 EC 48 0.0b 0.8b 0.2b 0.2b 0.4b Imidan 50 WP 1.2b 0.5b 0.8b 0.2b 1.2b Untreated Check 13.8a 7.8a 5.2a 2.8a 9.3a TEST 2 Oz No. blueberry spanworm larvae/10 sweeps" form./ Treatment acre 21 May* 23 May 24 May 26 May 27 May Able 50 WP 16 15.5a 20.0a 2.8b 2.8a 5.2ab Agree 50 W P 16 16.2a 20.8a 9.2a 4.8a 4.5ab Javelin WG 16 14.8a 16.0a 4.8ab 2.8a 2.2b Untreated Check 16.2a 7.8a 7.5a 15.0a 4.0a Seasonal 28 May 31 May 3 Jun density Able 50 W P 16 5.5a 1.8b 3.5a 3.7b Agree 50 W P 16 10.0a 7.5a 6.0a 7.3a Javelin WG 16 6.8a 5.2ab 5.8a 4.7ab Untreated Check 11.8a 3.5ab 6.0a 6.6a "Means on each date followed by the same letters are not significantly different (/><0.05; DMRT). Data were transformed by log (X + 1) for analysis. 1 0 *Prespray count. "Seasonal densities are trapezoidal integrals of densities over the season divided by the duration (in number of days) of the experiment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Spanworm Control, 1996A

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.49
Publisher site
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/49/4639772 by DeepDyve user on 21 July 2020 C: SMALL FRUITS Arthropod Management Tests, Vol. 22 49 SMALL FRUITS BLUEBERRY: Vaccinium angustifolium Aiton 'lowbush' J.A.Collins, (1C) Blueberry spanworm; Itame argillacearia (Packard) F. A. Drummond Dept. of Applied Ecology and Environmental Sciences, University of Maine, Orono, M E 04469 (207)581-2960 SPANWORM CONTROL, 1996A: Materials were applied on 22 May to 20 by 20 ft plots in a bearing blueberry field at Jonesboro, Maine. There were 4 replications of each treatment and a minimum 5-ft untreated buffer strip around each plot. Treatments were blocked according to prespray popula­ tion levels. Insecticides were applied at a rate of 25 gpa using a C0 -propelled 40-inch boom sprayer with 4, flat spray, 800067 TeeJet nozzles operating at 35 psi (Test 1) or a C0 -propelled 80-inch boom sprayer with 4, flat spray, 80002VS TeeJet nozzles operating at 30 psi (Test 2). At treatment, larvae were first to third instar and plants were ca. 10% swollen bud, 40% tight cluster, 50% loose cluster. On sample dates indicated in table, 10 sweeps with a standard 12-inch sweep-net were taken systematically through the center area of each plot avoiding plot boundaries. The larvae were counted and then dis­ tributed back into the same plot. High winds on 27 and 28 May made sweep-net sampling difficult and may have confounded the results for those two dates. In Test 1, Imidan 2.5 EC provided excellent control of early instar spanworm larvae; 24 oz and 48 oz rates resulted in reductions which were not significantly different. Reduction in larval density with Imidan 50 W P was not significantly different from Imidan 2.5 EC; it also gave excellent control. Variation in the results between sample dates in Test 2 make it difficult to draw firm conclusions from the data. However, of the 3 formulations tested, Able and Javelin seemed to be effective compared with untreated check in respect of seasonal density. No phytotoxicity was apparent in any plot in either test. TEST1 Oz No. blueberry spanworm larvae/10 sweeps form./ Treatment acre 21 May* 23 May 24 May 26 May 27 May Imidan 2.5 EC 24 0.2b 18.5a 2.2b 0.2c 0.5b Imidan 2.5 EC 48 0.2b 21.0a 2.5b 0.0c 0.8b Imidan 50 W P 16 0.8b 19.2a 6.5b 1.2b 1.5b Untreated Check 5.0a 18.5a 25.0a 10.0a 7.8a Seasonal 28 May 31 May 3 Jun 6 Jun density Imidan 2.5 EC 24 1.0b 0.0b 0.2b 0.0b 0.4b Imidan 2.5 EC 48 0.0b 0.8b 0.2b 0.2b 0.4b Imidan 50 WP 1.2b 0.5b 0.8b 0.2b 1.2b Untreated Check 13.8a 7.8a 5.2a 2.8a 9.3a TEST 2 Oz No. blueberry spanworm larvae/10 sweeps" form./ Treatment acre 21 May* 23 May 24 May 26 May 27 May Able 50 WP 16 15.5a 20.0a 2.8b 2.8a 5.2ab Agree 50 W P 16 16.2a 20.8a 9.2a 4.8a 4.5ab Javelin WG 16 14.8a 16.0a 4.8ab 2.8a 2.2b Untreated Check 16.2a 7.8a 7.5a 15.0a 4.0a Seasonal 28 May 31 May 3 Jun density Able 50 W P 16 5.5a 1.8b 3.5a 3.7b Agree 50 W P 16 10.0a 7.5a 6.0a 7.3a Javelin WG 16 6.8a 5.2ab 5.8a 4.7ab Untreated Check 11.8a 3.5ab 6.0a 6.6a "Means on each date followed by the same letters are not significantly different (/><0.05; DMRT). Data were transformed by log (X + 1) for analysis. 1 0 *Prespray count. "Seasonal densities are trapezoidal integrals of densities over the season divided by the duration (in number of days) of the experiment.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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