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EVALUATION OF SELECTED FOLIAR BROADCAST ACARICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE IN NORTH CAROLINA COTTON, 2007

EVALUATION OF SELECTED FOLIAR BROADCAST ACARICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE IN NORTH... (F27) COTTON: Gossypium hirsutum L., ‘DP 444 BG/RR’ EVALUATION OF SELECTED FOLIAR BROADCAST ACARICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE IN NORTH CAROLINA COTTON, 2007 D.A. Herbert, Jr. & S. Malone Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450 Fax: (757) 657-9333 E-mail: herbert@vt.edu Twospotted spider mite (TSM): Tetranychus urticae Koch Selected foliar treatments were evaluated for control of TSM in a grower’s field in Chowan Co., NC. Oberon, Zephyr, Zeal, Capture, Portal + Agri-Dex, Comite, and Kelthane were broadcast on 28 Jun with a CO pressurized backpack sprayer at 14.3 gpa and 18 psi through 8002VS nozzles spaced 18 inches apart on the spray boom. Treatments were evaluated at 4, 7, 11, and 18 DAT by counting the number of TSM between two veins of a cotton leaf per plot. This represented 27.1% (n = 38, SD = 2.8) of the entire leaf area on 2 Jul. A RCBdesign was used with 4 replicates; plots were 4 rows by 10 ft. Data were analyzed using ANOVA and LSD procedures. Pre-treatment counts on 28 Jun had a mean of 37.9 TSM between the two leaf veins (n = 20, SD = 14.1). All treatments except some of the Oberon treatments had significantly fewer TSM than the untreated check at 4 and 7 DAT. By 11 DAT, TSM populations in the Capture and Comite treatments were also the same as the untreated check. Populations had decreased by 18 DAT. Table 1. Twospotted spider mites/sample Treatment/ Rate formulation (lb ai/A) 4 DAT 7 DAT 11 DAT 18 DAT Oberon 4SC 0.125 22.50ab 36.75ab 11.25bc 2.25 Oberon 4SC 0.188 20.75a-c 18.75bc 14.50a-c 4.50 Oberon 4SC 0.25 10.25cd 27.25a-c 7.75c 1.00 Zephyr 0.15EC 0.0094 12.25b-d 11.50c 5.25c 0.50 Zeal 72WP 0.045 11.50cd 22.00bc 7.75c 0.75 Capture 2EC 0.078 13.75b-d 22.25bc 24.50ab 2.25 Portal 0.4EC 0.05 17.25bc 12.50c 12.50bc 6.75 + Agri-Dex 0.25% v/v Comite II 1.50 10.50cd 15.00c 16.75a-c 1.25 Kelthane MF 4EC 1.00 5.75d 22.75bc 12.50bc 0.25 Check --- 31.00a 44.75a 28.25a 3.00 LSD 10.77 19.59 13.84 NS Means within a column followed by the same letter(s) are not significantly different (LSD; P = 0.05). A sample consisted of counting all twospotted spider mites between two veins of 1 leaf per plot. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SELECTED FOLIAR BROADCAST ACARICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE IN NORTH CAROLINA COTTON, 2007

Arthropod Management Tests , Volume 33 (1) – Jan 1, 2008

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/33.1.F27
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Abstract

(F27) COTTON: Gossypium hirsutum L., ‘DP 444 BG/RR’ EVALUATION OF SELECTED FOLIAR BROADCAST ACARICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE IN NORTH CAROLINA COTTON, 2007 D.A. Herbert, Jr. & S. Malone Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450 Fax: (757) 657-9333 E-mail: herbert@vt.edu Twospotted spider mite (TSM): Tetranychus urticae Koch Selected foliar treatments were evaluated for control of TSM in a grower’s field in Chowan Co., NC. Oberon, Zephyr, Zeal, Capture, Portal + Agri-Dex, Comite, and Kelthane were broadcast on 28 Jun with a CO pressurized backpack sprayer at 14.3 gpa and 18 psi through 8002VS nozzles spaced 18 inches apart on the spray boom. Treatments were evaluated at 4, 7, 11, and 18 DAT by counting the number of TSM between two veins of a cotton leaf per plot. This represented 27.1% (n = 38, SD = 2.8) of the entire leaf area on 2 Jul. A RCBdesign was used with 4 replicates; plots were 4 rows by 10 ft. Data were analyzed using ANOVA and LSD procedures. Pre-treatment counts on 28 Jun had a mean of 37.9 TSM between the two leaf veins (n = 20, SD = 14.1). All treatments except some of the Oberon treatments had significantly fewer TSM than the untreated check at 4 and 7 DAT. By 11 DAT, TSM populations in the Capture and Comite treatments were also the same as the untreated check. Populations had decreased by 18 DAT. Table 1. Twospotted spider mites/sample Treatment/ Rate formulation (lb ai/A) 4 DAT 7 DAT 11 DAT 18 DAT Oberon 4SC 0.125 22.50ab 36.75ab 11.25bc 2.25 Oberon 4SC 0.188 20.75a-c 18.75bc 14.50a-c 4.50 Oberon 4SC 0.25 10.25cd 27.25a-c 7.75c 1.00 Zephyr 0.15EC 0.0094 12.25b-d 11.50c 5.25c 0.50 Zeal 72WP 0.045 11.50cd 22.00bc 7.75c 0.75 Capture 2EC 0.078 13.75b-d 22.25bc 24.50ab 2.25 Portal 0.4EC 0.05 17.25bc 12.50c 12.50bc 6.75 + Agri-Dex 0.25% v/v Comite II 1.50 10.50cd 15.00c 16.75a-c 1.25 Kelthane MF 4EC 1.00 5.75d 22.75bc 12.50bc 0.25 Check --- 31.00a 44.75a 28.25a 3.00 LSD 10.77 19.59 13.84 NS Means within a column followed by the same letter(s) are not significantly different (LSD; P = 0.05). A sample consisted of counting all twospotted spider mites between two veins of 1 leaf per plot.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2008

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