Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F32 F32 COTTON: Gossypium hurtsutum L. ‘ST4498 B2RF’ EVALUATION OF AT-PLANTING GRANULAR INSECTICIDES, SEED TREATMENTS AND FOLIAR SPRAYS FOR THRIPS CONTROL ON EARLY PLANTED COTTON, 2010 Jack S. Bacheler Box 7613, Dept. of Entomology North Carolina State Univ. Raleigh, NC 27695-7613 Phone: (919) 515- 8877 firstname.lastname@example.org Dan W. Mott Thrips: Frankliniella fusca (Hinds) Cotton was planted on 28 Apr in conventional tillage on an Acock very fine sandy loam soil at the Upper Coastal Plain Research Station near Rocky Mount, NC. Plots were 4 rows by 40 ft with four replicates in a RCBD, with the middle 2 rows treated with either Temik 15G, or a seed treatment as indicated in the table. The at-planting granular insecticide was dispensed via a tractor-mounted plywood box with holes to fit inverted Mason jars. The jar lids were calibrated to deliver a precise amount of insecticide when the jars were inverted over the holes at a constant, known tractor speed. The holes in the plywood platform led directly into the open furrow via funnels under which flexible tubes had been placed. A foliar treatment of Orthene 97 SG at 0.25 lb (AI)/acre was s prayed on treatments 5 through 7 on 19 May with a CO -powered backpack sprayer calibrated to deliver 8.0 gpa at 50 psi with a single TX-8 Spraying Systems nozzle per row. On 17 and 24 May and on 2 Jun, five cotton seedlings per plot (20 per treatment) were carefully cut off just below the cotyledon stage with a razor blade, put into Mason jars filled with soapy water, transported back to NCSU, and processed using the washing/screening technique and put into vials of 70% isopropyl alcohol. Thrips were later counted under a dissecting stereomicroscope and separated into immatures (larvae) and adults. Plant heights were taken on 8 Jun by measuring 10 plants per plot (40 total per treatment) from the middle two rows. The center 2 rows of each plot were harvested with 2 -row John Deere mechanical harvester on 23 Oct. All field data were entered into Gylling’s ARM 6.2 software and analyzed via ANOVA with LSD (P = 0.05) values shown in the table. At the initial 17 May thrips assessment (approx. 3 wk after planting), total thrips levels in the untreated check plots were significantly higher than the remaining treatments, while the Aeris seed treatment and the Aeris plus Orthene treatment showed statisticall y higher thrips levels than Temik and Temik (high rate) plus Aeris. At this initial assessment, the Orthene plots had not been treated. At the 24 May assessment, the untreated check had statistically more thrips than all of the other treatments, while none of these remaining treatments were significantly different. At the final 2 Jun assessment, the untreated check had significantly more total thrips than all of the remaining treatments except for the Aeris seed treatment alone, while Aeris alone, Temik (low rate) plus Aeris and Temik alone had numerically greater levels than the remaining treatments except for the untreated check. Thrips levels at this time were considered moderate (approx. 22 thrips per plant 5 wk after planting). Plant heights taken on 8 Jun revealed that the three way combinat ion of Aeris plus Temik plus a foliar Orthene spray had statistically greater plant heights than either the Temik (high rate) plus Aeris or the Aeris alone treatments. Yields taken on 23 Oct were statistically inseparable. 1 Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F32 No. thrips/5 plants No. thrips/5 plants No. thrips/5 plants 17 May 24 May 2 Jun Plant ht Yield Treatment/ Rate cm (mean/5 (lb lint/acre) formulation (AI)/seed or acre Immatures Adults Total Immatures Adults Total Immatures Adults Total plants) 8 Jun 23 Oct Untreated - 16.25a 18.00a 34.25a 47.00a 9.25a 56.25a 92.25a 20.25a 112.50a 22.75abc 784.68a Temik 15G 0.75 (AI)/acre 0.00c 3.00c 3.00d 4.25b 2.50b 6.75b 40.00cd 19.50a 59.50bc 22.75abc 766.62a Temik 15G 0.75/acre +Aeris +0.375 mg/seed 1.75bc 2.75c 4.50d 1.75b 1.25b 3.00b 25.50cde 8.50b 34.00cde 21.75bc 772.75a Temik 15G 0.52/acre +Aeris + 0.375 mg\seed 3.50bc 3.75c 7.25cd 5.25b 4.00b 9.25b 45.00bc 11.50ab 56.50bcd 22.50abc 771.78a Aeris 0.375 mg/seed 4.25bc 10.00d 14.25bc 5.50b 4.00b 9.50b 70.25ab 20.25a 90.50ab 21.50c 780.49a Temik 15G 0.75/acre + 2.00bc 3.75c 5.75d 0.50b 1.25b 1.75b 11.00de 9.50b 20.50de 22.50abc 723.06a +Orthene 97SG 0.25 lb/acre Temik 15G + 0.52 (AI)/acre +Aeris + 0.375 mg/seed Orthene 97SG + 0.25 (AI)/acre 1.25bc 3.25c 4.50d 1.00b 0.50b 1.50b 4.25e 5.25b 9.50e 24.25a 796.30a Aeris 0.375 mg/seed +Orthene 97SG + 0.25 (AI)/acre 5.50b 10.75b 16.25b 2.25b 1.50b 3.75b 14.25de 5.75b 20.00e 24.00ab 773.71a Means in a column sharing the same letter are not significantly different (LSD; P = 0.05) Aeris is a mixture of Gaucho Grande 5FS at 0.375 mg/seed plus thiodicarb 0.375 mg/seed.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2011