Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F37 F37 COTTON: Gossypium hirsutum (L.), ‘DP 555 BG/RR’ Jarrod T. Hardke LSU AgCenter Department of Entomology 404 Life Sciences Bldg. Baton Rouge, LA 70803 Phone: (225) 578-1839 Fax: (225) 578-1643 E-mail: email@example.com Joshua H. Temple firstname.lastname@example.org Paul P. Price email@example.com B. Rogers Leonard firstname.lastname@example.org Jessica L. Moore email@example.com Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) Insecticide efficacy trials were conducted at the Northeast Research Station (NERS) near St. Joseph, LA (Tensas Parish) and the Macon Ridge Research Station (MRRS) near Winnsboro, LA (Franklin Parish). Cottonseed was planted into a Commerce silt loam on 25 May at NERS (trial 1) and a Gigger silt loam on 1 Jun at MRRS (trials 2 and 3). Plot size was four to eight rows (40-inches on row centers) X 50 ft with four replications. Insecticides were applied with a high-clearance sprayer and compressed air system calibrated to deliver 12 GPA through TeeJet TX-10 hollow cone nozzles (2/row) at 48 psi at NERS and at 9.5 GPA through TeeJet TX-8 hollow cone nozzles (2/row) at 50 psi at MRRS. In trial 1, insecticides were applied on 20 and 29 Jul, and post-treatment evaluations were made on 3, 7 DAT1, and 2, 7, 12 DAT2. In trial 2, insecticides were applied on 3 Aug and post-treatment evaluations were made on 3, 8, 10, 14 DAT. In trial 3, insecticides were applied on 25 Aug and post-treatment evaluations were made on 3, 7, 10 DAT. Plots were sampled with a standard 2.5 × 2.5 ft black cloth shake sheet by taking two samples on two-four rows (10 row ft total) of each plot. Data were subjected to ANOVA and means separated according to DNMRT. Rainfall of 7.61, 1.46, and 0.4 inches occurred during trials 1, 2, and 3, respectively. Across all three trial areas, pre-treatment numbers of TPB exceeded the action threshold of 2-3 insects/5 row ft established by the Louisiana Cooperative Extension Service. In trial 1, no insecticide reduced TPB adults below that in the non-treated plots. At 3 and 7 DAT1, all insecticides except for sulfoxaflor (0.022 and 0.045 lb AI/acre) significantly reduced TPB nymphs below that in the non- treated plots. At 2 DAT2, the 0.045 and 0.067 lb AI/acre rates of sulfoxaflor applied at timing A and all insecticides re-applied at timing B significantly reduced TPB nymphs compared to the non-treated control. At 7 DAT2, all plots treated once with insecticides had TPB nymphs similar to that in the non-treated control. All plots receiving the second application had fewer TPB nymphs compared to that in the non-treated plots at 7 and 12 DAT2. In trial 2, all insecticide-treated plots had significantly fewer TPB nymphs than that in the non-treated plots at 3 DAT. At 8 DAT, all insecticides significantly reduced TPB adults and nymphs compared to the non-treated control. Sulfoxaflor (0.034, 0.045, and 0.056 lb AI/acre) significantly reduced TPB adults and nymphs compared to the non-treated control at 10 DAT. No significant treatment effects were detected for TPB at 14 DAT. In trial 3, sulfoxaflor (0.045 lb AI/acre) + Brigade, sulfoxaflor (0.067 lb AI/acre) + Brigade, Brigade, and Endigo significantly reduced TPB nymphs below that in the non-treated control at 3 DAT. All sulfoxaflor treatments (alone and combined with Brigade) significantly reduced TPB nymphs compared to the non-treated, Brigade-treated, and Endigo-treated plots at 7 DAT. All insecticide-treated plots except those treated with Brigade alone had significantly fewer TPB nymphs compared to non-treated plots at 10 DAT. No phytotoxicity was observed with any treatment during these tests. 1 Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F37 Trial 1. No. TPB/5 row ft 3 DAT1 7 DAT1 2 DAT2 7 DAT2 12 DAT2 Rate, lb App. Treatment/form. (AI)/acre Timing Adult Nymph Adult Nymph Adult Nymph Adult Nymph Adult Nymph Sulfoxaflor 50WG 0.022 A 0.3a 6.3abc 1.0a 9.3ab 1.5a 6.0abc 0.3b 11.5a 2.0a 10.5ab Sulfoxaflor 50WG 0.034 A 1.3a 2.5cd 1.0a 6.0bc 0.3a 4.3abcd 0.5ab 11.0a 0.5b 7.5abc Sulfoxaflor 50WG 0.045 A 0.3a 3.8bcd 0.8a 7.0bc 1.0a 3.8bcd 0.8ab 7.8abc 0.5b 7.5abc Sulfoxaflor 50WG 0.067 A 0.3a 2.0cd 0.3a 6.0bc 1.3a 3.8bcd 0.5ab 8.8ab 0.3b 6.5bcd Orthene 90SP 1.0 A 0.8a 2.0cd 1.5a 5.5bc 0.3a 8.0ab 0.5ab 7.5abc 0.5b 8.5ab Sulfoxaflor 50WG 0.022 A+B 0.5a 9.0a 1.8a 7.8bc 0.8a 3.0cd 0.0b 3.3cd 0.0b 4.3cde Sulfoxaflor 50WG 0.034 A+B 1.3a 6.5abc 1.5a 5.3bc 1.0a 2.3cd 1.8a 4.3bcd 0.0b 3.8cde Sulfoxaflor 50WG 0.045 A+B 0.0a 2.0cd 1.0a 6.8bc 0.5a 1.8cd 0.5ab 5.3bcd 0.5b 2.5de Sulfoxaflor 50WG 0.067 A+B 0.0a 1.0d 0.8a 3.8c 0.3a 0.3d 0.8ab 2.3d 0.3b 3.5cde Orthene 90SP 1.0 A+B 0.0a 2.0cd 1.3a 5.5bc 0.3a 1.3d 0.5ab 2.0d 0.0b 1.3e Non-treated ---- 1.0a 7.0ab 1.8a 13.0a 1.5a 8.3a 0.3b 11.8a 1.0ab 10.8a P>F (ANOVA) 0.12 <0.01 0.83 0.01 0.19 <0.01 0.32 <0.01 0.04 <0.01 Means within columns followed by the same letter are not significantly different (DNMRT, P = 0.05). Application timing: A application on 20 Jul; A+B application on 20, 29 Jul. Trial 2. No. TPB/5 row ft 3 DAT 8 DAT 10 DAT 14 DAT Rate, lb Treatment/form. (AI)/acre Adult Nymph Adult Nymph Adult Nymph Adult Nymph Sulfoxaflor 50WG 0.022 3.4a 6.6b 1.6b 5.6b 1.0b 4.8a 0.4a 2.2a Sulfoxaflor 50WG 0.034 1.0a 4.6b 0.6b 3.2bc 0.6b 2.6b 0.6a 1.8a Sulfoxaflor 50WG 0.045 1.8a 3.4b 1.0b 2.4c 0.8b 1.6b 0.4a 1.0a Sulfoxaflor 50WG 0.056 1.2a 4.4b 0.6b 2.2c 0.6b 1.2b 0.4a 0.8a Sulfoxaflor 50WG 0.067 2.2a 4.4b 0.8b 1.8c 1.8ab 1.2b 0.4a 0.6a Orthene 90SP 1.0 1.6a 4.6b 1.0b 3.6bc 1.2ab 2.2b 0.4a 0.8a Centric 40WG 0.047 2.4a 6.6b 0.6b 1.6c 2.0ab 1.8b 0.4a 0.8a Non-treated ---- 2.8a 12.0a 3.4a 10.4a 2.6a 4.6a 0.8a 2.6a P>F (ANOVA) 0.23 <0.01 <0.01 <0.01 0.03 <0.01 0.98 0.08 Means within columns followed by the same letter are not significantly different (DNMRT, P = 0.05). Trial 3. No. TPB/5 row ft 3 DAT 7 DAT 10 DAT Rate, lb Treatment/form. (AI)/acre Adult Nymph Adult Nymph Adult Nymph Sulfoxaflor 50WG 0.067 3.0a 11.3abc 0.0c 0.8c 2.8a 4.8b Sulfoxaflor 50WG 0.067 1.8a 9.8bc 0.3c 2.5c 1.5a 3.5b + Brigade 2EC 0.03 Sulfoxaflor 50WG 0.045 2.3a 14.0abc 1.8ab 3.8c 1.3a 5.5b Sulfoxaflor 50WG 0.045 1.5a 7.3c 1.5abc 3.0c 2.3a 5.5b + Brigade 2EC 0.03 Sulfoxaflor 50WG 0.022 3.3a 16.3ab 1.0bc 3.8c 0.5a 6.0b Sulfoxaflor 50WG 0.022 3.0a 10.5abc 1.5abc 4.3c 3.3a 6.0b + Brigade 2EC 0.03 Brigade 2EC 0.03 1.5a 9.8bc 2.8a 15.8a 2.8a 17.0a Endigo 2.06SC 0.0885 2.5a 9.0c 1.3abc 10.3b 1.8a 8.3b Non-treated ---- 1.8a 17.5a 1.8ab 14.0ab 1.0a 16.8a P>F (ANOVA) 0.66 0.04 0.04 <0.01 0.09 <0.01 Means within columns followed by the same letter are not significantly different (DNMRT, P = 0.05).
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2011