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EVALUATION OF SELECTED ACARICIDES AGAINST TWOSPOTTED SPIDER MITE IN COTTON, 2008

EVALUATION OF SELECTED ACARICIDES AGAINST TWOSPOTTED SPIDER MITE IN COTTON, 2008 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F40 (F40) COTTON: Gossypium hirsutum (L.) J. Eric Howard University of Arkansas Division of Agriculture Department of Entomology 1408 Scogin Drive Monticello, AR 71656 Phone: (870) 460-1393 Fax: (870) 460-1415 E-mail: howardje@uamont.edu D. Scott Akin E-mail: sakin@uaex.edu Twospotted spider mite (TSSM): Tetranychus urticae Koch Several acaricides were evaluated for control of TSSM on a commercial farm near Barton, AR. Treatments were applied to cotton in full bloom on 15 Jul. Plot size was 6 rows (38-inch centers) x 30 ft in length, and arranged in an RCB design with four replications. Treatment applications were made with a Mudmaster 4WD multi-purpose sprayer equipped with a rear-mounted CO -charged multi- ® ® boom system (R&D Sprayers , Opelousas, LA) calibrated to deliver 10 gpa through Teejet TX-6 hollow cone nozzles (19-inch nozzle spacing). Treatment efficacy was evaluated at 5 and 9 DAT by using a 1-inch linen tester to count mites on 5 entire leaves randomly selected from the middle 2 rows of each plot. Data were log-transformed and subjected to ANOVA with means separated using DNMRT (α=0.05). At 5 DAT, only Brigade and the high rate of Agri-Mek reduced mite numbers statistically when compared to the untreated check. The lowest number of mites at this time was found in plots that were treated with Brigade, the one pyrethroid evaluated in the experiment. At 9 DAT, while the mean number of mites per 5 leaves remained somewhat constant in the untreated check (65.4-68.8 mites/5 leaves), numbers across treatments varied considerably compared to the 5 DAT. For example, Dicofol, Comite II, and the high rate of Athena joined Agri-Mek in significantly reducing the numbers of spider mites below the untreated check at 9 DAT. While the number of mites either increased or remained stable in most treatments, mite numbers increased substantially in the Brigade treatment. The most effective treatments at 9 DAT were Comite II and the higher rate of Agri-Mek, the latter being considered the most consistent performer in this particular trial. This research was supported by industry gifts of products and research funding. twospotted spider mites (No./5 leaves) Treatment/ Rate lb formulation (AI)/acre 5 DAT 9 DAT Brigade 2EC 0.1 5.5c 26.5ab Dicofol 4EC 1.5 21.0abc 10.7bc Comite II 6EC 1.688 17.4abc 3.7c Portal 0.4EC 0.05 54.1ab 27.6ab Zeal 72WDG 0.045 55.7ab 17.0abc Agri-Mek 0.15EC 0.0047 37.2abc 25.7ab Agri-Mek 0.15EC 0.0141 15.3bc 3.8c Oberon 4SC 0.125 65.1a 38.5ab Oberon 4SC 0.25 33.8abc 32.9ab Athena 0.87SC 0.0272 27.9abc 18.2ab Athena 0.87SC 0.0544 37.5abc 15.8bc Untreated check - 65.4a 68.8a P>F (ANOVA) - 0.0411 0.0028 Means within columns followed by a common letter are not significantly different (DNMRT; P=0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SELECTED ACARICIDES AGAINST TWOSPOTTED SPIDER MITE IN COTTON, 2008

Arthropod Management Tests , Volume 37 (1) – Jan 1, 2012

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10.4182/amt.2012.F40
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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F40 (F40) COTTON: Gossypium hirsutum (L.) J. Eric Howard University of Arkansas Division of Agriculture Department of Entomology 1408 Scogin Drive Monticello, AR 71656 Phone: (870) 460-1393 Fax: (870) 460-1415 E-mail: howardje@uamont.edu D. Scott Akin E-mail: sakin@uaex.edu Twospotted spider mite (TSSM): Tetranychus urticae Koch Several acaricides were evaluated for control of TSSM on a commercial farm near Barton, AR. Treatments were applied to cotton in full bloom on 15 Jul. Plot size was 6 rows (38-inch centers) x 30 ft in length, and arranged in an RCB design with four replications. Treatment applications were made with a Mudmaster 4WD multi-purpose sprayer equipped with a rear-mounted CO -charged multi- ® ® boom system (R&D Sprayers , Opelousas, LA) calibrated to deliver 10 gpa through Teejet TX-6 hollow cone nozzles (19-inch nozzle spacing). Treatment efficacy was evaluated at 5 and 9 DAT by using a 1-inch linen tester to count mites on 5 entire leaves randomly selected from the middle 2 rows of each plot. Data were log-transformed and subjected to ANOVA with means separated using DNMRT (α=0.05). At 5 DAT, only Brigade and the high rate of Agri-Mek reduced mite numbers statistically when compared to the untreated check. The lowest number of mites at this time was found in plots that were treated with Brigade, the one pyrethroid evaluated in the experiment. At 9 DAT, while the mean number of mites per 5 leaves remained somewhat constant in the untreated check (65.4-68.8 mites/5 leaves), numbers across treatments varied considerably compared to the 5 DAT. For example, Dicofol, Comite II, and the high rate of Athena joined Agri-Mek in significantly reducing the numbers of spider mites below the untreated check at 9 DAT. While the number of mites either increased or remained stable in most treatments, mite numbers increased substantially in the Brigade treatment. The most effective treatments at 9 DAT were Comite II and the higher rate of Agri-Mek, the latter being considered the most consistent performer in this particular trial. This research was supported by industry gifts of products and research funding. twospotted spider mites (No./5 leaves) Treatment/ Rate lb formulation (AI)/acre 5 DAT 9 DAT Brigade 2EC 0.1 5.5c 26.5ab Dicofol 4EC 1.5 21.0abc 10.7bc Comite II 6EC 1.688 17.4abc 3.7c Portal 0.4EC 0.05 54.1ab 27.6ab Zeal 72WDG 0.045 55.7ab 17.0abc Agri-Mek 0.15EC 0.0047 37.2abc 25.7ab Agri-Mek 0.15EC 0.0141 15.3bc 3.8c Oberon 4SC 0.125 65.1a 38.5ab Oberon 4SC 0.25 33.8abc 32.9ab Athena 0.87SC 0.0272 27.9abc 18.2ab Athena 0.87SC 0.0544 37.5abc 15.8bc Untreated check - 65.4a 68.8a P>F (ANOVA) - 0.0411 0.0028 Means within columns followed by a common letter are not significantly different (DNMRT; P=0.05).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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