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EVALUATION OF FOLIAR INSECTICIDES AGAINST THRIPS ON SEEDLING COTTON, 2012

EVALUATION OF FOLIAR INSECTICIDES AGAINST THRIPS ON SEEDLING COTTON, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F34 (F34) COTTON: Gossypium hirsutum L., ‘DP 0912B2RF’ Karla Emfinger LSU Agricultural Center Macon Ridge Research Station 212A Macon Ridge Road Winnsboro, LA 71295 Phone: 318-435-2157 Fax: 318-435-2133 E-mail: kemfinger@agcenter.lsu.edu Shelby Williams E-mail: twilliams@agcenter.lsu.edu Jared Chapman E-mail: jchapman@agcenter.lsu.edu David Kerns E-mail: dkerns@agcenter.lsu.edu Tobacco thrips (TT): Frankliniella fusca (Hinds) Western flower thrips (WFT): Frankliniella occidentalis (Pergande) Selected foliar insecticides were evaluated for control of thrips on cotton seedlings at the Macon Ridge Research Station (Franklin Parish). ‘DP 0912B2RF’ cotton seed were planted into a Gigger-Gilbert silt loam soil on 14 Apr. Plot size was four rows (40-inches on centers) X 50 ft. Treatments were placed in a RCB design with four replications. Insecticides were applied with a hand boom and compressed air system calibrated to deliver 10 gpa through TX-6 flat fan nozzles (2/row) at 40 psi on 3 May. Insecticide efficacy was measured by randomly selecting 10 plants per plot and counting the number of thrips (immatures and adults) at 4 DAT (7 May) and 8 DAT (11 May). Plant samples were processed using whole plant washing procedures to remove thrips. Thrips adults were identified to species and adult and immature thrips were counted using a dissecting microscope. Data were subjected to ANOVA and means separated according to DNMRT (P ≤ 0.05). Total rainfall of 0.71 inches occurred during the test. The thrips population was approximately 50% WFT and 50% TT. There were no significant differences observed in the number of adult thrips compared to the non-treated plots at 4 DAT. All insecticides except plots treated with HGW 086 (0.134 lb-ai/A) significantly reduced numbers of thrips immatures and total thrips at 4 DAT compared to the non-treated plots. There were significantly fewer adults in plots treated with Radiant, Orthene (8.0 fl oz/A), Bidrin, and Radiant + Orthene compared to the non-treated plots at 8 DAT. All insecticides except plots treated with HGW 086 (0.066 lb-ai/A) significantly reduced numbers of thrips immatures and total thrips at 8 DAT compared to the non-treated plots. All insecticides significantly reduced seedling damage ratings compared to that in non-treated plots at 10 DAT. Seedling damage in plots treated with Radiant, Orthene (8.0 oz/A), Bidrin, and Radiant + Orthene were significantly lower than that in the Orthene (3.2 oz/A), Dimethoate, Lannate, HGW 086 (both rates) and non-treated plots at 10 DAT. At 13 DAT, plots treated with Radiant (3.0 fl oz/A), Orthene (8.0 oz/A), Bidrin, and Radiant + Orthene significantly reduced seedling damage ratings compared to plots treated with Radiant (1.5 fl oz/A), Orthene (8.0 oz/a), Dimethoate, Lannate, and HGW 086 (both rates). No phytotoxicity was observed with the insecticides used in this test. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F34 Table 1. Thrips/10 plants 4 DAT (May 7) 8 DAT (May 11) Damage rating (1-5) Treatment/ Rate amt formulation product/ac Adults Immatures Total Adults Immatures Total 10 DAT 13 DAT Radiant 1SC 3.0 fl oz 5.0a 16.3d 21.3d 6.3cd 4.8f 11.0g 1.0e 2.0e Radiant 1SC 1.5 fl oz 6.0a 19.5d 25.5d 7.0bcd 7.5def 14.5efg 1.3e 2.8cd Orthene 97 3.2 oz 2.5a 31.3d 33.8d 14.5a 9.8def 24.3def 1.8d 2.8cd Orthene 97 8.0 oz 3.3a 13.3d 16.5d 4.5d 1.3f 5.8g 1.0e 2.0e Dimethoate 4EC 4.0 fl oz 3.3a 87.5bc 90.8bc 14.3a 21.8bc 36.0cd 3.0bc 4.0a Dimethoate 4EC 8.0 fl oz 2.85a 96.3bc 99.0bc 12.0abc 14.5cde 26.5de 2.8c 3.0bc Bidrin 8EC 3.2 fl oz 0.8a 24.5d 25.3d 6.8bcd 6.3ef 13.0fg 1.3e 2.5cde Lannate 90SP 0.23 lb 5.5a 74.3c 79.8c 12.8ab 15.5cd 28.3cd 3.0bc 3.8a HGW 086 10OD 0.066 lb-ai 4.7a 104.3bc 109.0bc 16.0a 35.8a 51.8ab 3.0bc 3.8a HGW 086 10OD 0.134 lb-ai 3.3a 127.8ab 131.0ab 14.3a 25.0b 39.3bc 3.3b 3.5ab Radiant 1SC 1.5 fl oz + 6.0a 14.5d 20.5d 7.3bcd 6.3ef 13.5fg 1.0e 2.3de + Orthene 97 3.2 oz Non-treated --- 5.5a 151.5a 157.0a 15.5a 40.5a 56.0a 3.8a 4.0a Means within columns followed by a common letter are not significantly different (DNMRT, P ≤ 0.05). Included the non-ionic surfactant Dyne-Amic at 0.5 % v/v. Included the adjuvants MSO at 0.25 % v/v and Buffer Xtra at 0.125 % v/v. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF FOLIAR INSECTICIDES AGAINST THRIPS ON SEEDLING COTTON, 2012

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Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F34 (F34) COTTON: Gossypium hirsutum L., ‘DP 0912B2RF’ Karla Emfinger LSU Agricultural Center Macon Ridge Research Station 212A Macon Ridge Road Winnsboro, LA 71295 Phone: 318-435-2157 Fax: 318-435-2133 E-mail: kemfinger@agcenter.lsu.edu Shelby Williams E-mail: twilliams@agcenter.lsu.edu Jared Chapman E-mail: jchapman@agcenter.lsu.edu David Kerns E-mail: dkerns@agcenter.lsu.edu Tobacco thrips (TT): Frankliniella fusca (Hinds) Western flower thrips (WFT): Frankliniella occidentalis (Pergande) Selected foliar insecticides were evaluated for control of thrips on cotton seedlings at the Macon Ridge Research Station (Franklin Parish). ‘DP 0912B2RF’ cotton seed were planted into a Gigger-Gilbert silt loam soil on 14 Apr. Plot size was four rows (40-inches on centers) X 50 ft. Treatments were placed in a RCB design with four replications. Insecticides were applied with a hand boom and compressed air system calibrated to deliver 10 gpa through TX-6 flat fan nozzles (2/row) at 40 psi on 3 May. Insecticide efficacy was measured by randomly selecting 10 plants per plot and counting the number of thrips (immatures and adults) at 4 DAT (7 May) and 8 DAT (11 May). Plant samples were processed using whole plant washing procedures to remove thrips. Thrips adults were identified to species and adult and immature thrips were counted using a dissecting microscope. Data were subjected to ANOVA and means separated according to DNMRT (P ≤ 0.05). Total rainfall of 0.71 inches occurred during the test. The thrips population was approximately 50% WFT and 50% TT. There were no significant differences observed in the number of adult thrips compared to the non-treated plots at 4 DAT. All insecticides except plots treated with HGW 086 (0.134 lb-ai/A) significantly reduced numbers of thrips immatures and total thrips at 4 DAT compared to the non-treated plots. There were significantly fewer adults in plots treated with Radiant, Orthene (8.0 fl oz/A), Bidrin, and Radiant + Orthene compared to the non-treated plots at 8 DAT. All insecticides except plots treated with HGW 086 (0.066 lb-ai/A) significantly reduced numbers of thrips immatures and total thrips at 8 DAT compared to the non-treated plots. All insecticides significantly reduced seedling damage ratings compared to that in non-treated plots at 10 DAT. Seedling damage in plots treated with Radiant, Orthene (8.0 oz/A), Bidrin, and Radiant + Orthene were significantly lower than that in the Orthene (3.2 oz/A), Dimethoate, Lannate, HGW 086 (both rates) and non-treated plots at 10 DAT. At 13 DAT, plots treated with Radiant (3.0 fl oz/A), Orthene (8.0 oz/A), Bidrin, and Radiant + Orthene significantly reduced seedling damage ratings compared to plots treated with Radiant (1.5 fl oz/A), Orthene (8.0 oz/a), Dimethoate, Lannate, and HGW 086 (both rates). No phytotoxicity was observed with the insecticides used in this test. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.F34 Table 1. Thrips/10 plants 4 DAT (May 7) 8 DAT (May 11) Damage rating (1-5) Treatment/ Rate amt formulation product/ac Adults Immatures Total Adults Immatures Total 10 DAT 13 DAT Radiant 1SC 3.0 fl oz 5.0a 16.3d 21.3d 6.3cd 4.8f 11.0g 1.0e 2.0e Radiant 1SC 1.5 fl oz 6.0a 19.5d 25.5d 7.0bcd 7.5def 14.5efg 1.3e 2.8cd Orthene 97 3.2 oz 2.5a 31.3d 33.8d 14.5a 9.8def 24.3def 1.8d 2.8cd Orthene 97 8.0 oz 3.3a 13.3d 16.5d 4.5d 1.3f 5.8g 1.0e 2.0e Dimethoate 4EC 4.0 fl oz 3.3a 87.5bc 90.8bc 14.3a 21.8bc 36.0cd 3.0bc 4.0a Dimethoate 4EC 8.0 fl oz 2.85a 96.3bc 99.0bc 12.0abc 14.5cde 26.5de 2.8c 3.0bc Bidrin 8EC 3.2 fl oz 0.8a 24.5d 25.3d 6.8bcd 6.3ef 13.0fg 1.3e 2.5cde Lannate 90SP 0.23 lb 5.5a 74.3c 79.8c 12.8ab 15.5cd 28.3cd 3.0bc 3.8a HGW 086 10OD 0.066 lb-ai 4.7a 104.3bc 109.0bc 16.0a 35.8a 51.8ab 3.0bc 3.8a HGW 086 10OD 0.134 lb-ai 3.3a 127.8ab 131.0ab 14.3a 25.0b 39.3bc 3.3b 3.5ab Radiant 1SC 1.5 fl oz + 6.0a 14.5d 20.5d 7.3bcd 6.3ef 13.5fg 1.0e 2.3de + Orthene 97 3.2 oz Non-treated --- 5.5a 151.5a 157.0a 15.5a 40.5a 56.0a 3.8a 4.0a Means within columns followed by a common letter are not significantly different (DNMRT, P ≤ 0.05). Included the non-ionic surfactant Dyne-Amic at 0.5 % v/v. Included the adjuvants MSO at 0.25 % v/v and Buffer Xtra at 0.125 % v/v.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2013

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