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EVALUATION OF AT-PLANTING INSECTICIDES AND SEED TREATMENTS AGAINST THRIPS, 2006, A

EVALUATION OF AT-PLANTING INSECTICIDES AND SEED TREATMENTS AGAINST THRIPS, 2006, A (F18) COTTON: Gossypium hurtsutum L. ‘DP 444 BR’ Jack S. Bacheler Box 7613, Dept. of Entomology North Carolina State Univ. Raleigh, NC 27695-7613 Phone: (919) 515- 8877 jack_bacheler@ncsu.edu Dan W. Mott dan_mott@ncsu.edu Thrips; primarily; Frankliniella fusca (Hinds) Cotton was planted on 3 May 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 RCB design with the middle 2 rows treated with either Temik 15G, or a seed treatment as indicated in the tables. 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 sprayed on treatments 5 through 9 on 24 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 24 and 31 May and on 7 Jun, five cotton seedlings per plot (20 per treatment) were carefully cut off with a razor blade, put into Mason jars filled with soapy water, transported back to NCSU, and processed using the washing/screening technique. Thrips were later counted under a dissecting stereomicroscope and separated into immatures (larvae) and adults. Plant heights were taken on 22 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 5 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 24 May thrips assessment (3 wk after planting), the Avicta Complete Pak + Temik “+ Orthene” treatment showed the lowest level of total thrips numerically, while the Cruiser seed treatment had significantly fewer thrips than the Gaucho Grande treatment, and the other non-check treatments. It should be noted that the Orthene spray had not taken place until after these samples were taken. By 31 May (4 wk after planting), the untreated check had significantly greater numbers of immature and total thrips than all of the other treatments, and all of the non-check treatments were statistically similar. By 7 Jun (5 wk after planting), thrips levels in the untreated check were only 12% of that found 7 d prior, and Avicta Complete Pak alone was the only treatment that showed total thrips levels that were statistically similar to the check. Plant heights in all treatments were significantly (and dramatically) greater than in the untreated check, and the Temik + Orthene treatment showed significantly greater plant heights than the Cruiser + Orthene treatment. Lint yields in all of the treatments were greater than the untreated check. The Avicta Complete Pak + Temik + Orthene and the Avicta Complete Pak + Orthene treatments showed statistically greater yields than Avicta Complete Pak alone and Cruiser + Orthene. No. thrips/5 plants No. thrips/5 plants No. thrips/5 plants Plant ht cm 24 May 31 May 7 Jun (mean/10 Yield plants) (lb lint/acre) Treatment/formulation mg (AI)/seed Immatures Adults Total Immatures Adults Total Immatures Adults Total 22 Jun 5 Oct Check --- 72.8a 20.8a 93.5a 259.3a 8.3a 259.3a 21.8ab 8.8a 30.5ab 23.0c 932.9c Avicta Complete Pak 500 FS 0.15 + 0.52 7.5c 3.0c 10.5c 20.0b 5.3ab 20.0b 15.5b 7.0a 22.5b 48.1ab 1138.0ab + Temik 15G (AI)/acre Avicta Complete Pak 500 FS 0.15 + 0.75 8.3c 5.3c 13.5c 33.8b 5.3ab 33.8b 36.0a 8.8a 44.8a 46.92ab 1108.9b + Temik 15G (AI)/acre Temik 15G 0.75 (AI)/acre 8.8c 2.0c 10.8c 10.8b 1.3b 10.8b 8.5b 10.3a 18.8b 47.66ab 1174.3ab Avicta Complete Pak 500 FS 0.15 + 0.52 4.0c 3.5c 7.5c 7.0b 2.5b 7.0b 16.8b 7.3 24.0b 48.76ab 1214.2a + Temik 15G (AI)/acre+ + Orthene 97SG 0.25 (AI)/acre Avicta Complete Pak 500 FS 0.15 + 0.25 13.3bc 3.3c 16.5c 10.5b 2.8b 10.5b 13.0b 8.5a 21.5b 47.12ab 1210.6a + Orthene 97SG (AI)/acre Temik 15G 0.52 + 0.25 13.8bc 2.8c 16.5c 8.8b 2.0b 8.8b 13.3b 11.8a 25.0b 51.26a 1141.6ab + Orthene 97SG (AI)/acre Cruiser 5FS 0.33 + 0.25 12.3bc 5.0c 17.3c 12.5b 2.3b 12.5b 10.3b 9.0a 19.3b 46.2b 1114.4b + Orthene 97SG (AI)/acre Gaucho Grande 5FS 0.375 + 0.25 25.8b 12.0b 37.8b 22.8b 3.0b 22.8b 9.5b 11.8a 21.3b 47.54ab 1138.0ab + Orthene 97SG (AI)/acre LSD (0.05) 14.62 3.69 16.04 29.95 4.04 29.95 14.83 5.10 15.98 2.276 94.59 Means sharing the same letter are not significantly different (LSD; P = 0.05) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF AT-PLANTING INSECTICIDES AND SEED TREATMENTS AGAINST THRIPS, 2006, A

Arthropod Management Tests , Volume 32 (1) – Jan 1, 2007

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Abstract

(F18) COTTON: Gossypium hurtsutum L. ‘DP 444 BR’ Jack S. Bacheler Box 7613, Dept. of Entomology North Carolina State Univ. Raleigh, NC 27695-7613 Phone: (919) 515- 8877 jack_bacheler@ncsu.edu Dan W. Mott dan_mott@ncsu.edu Thrips; primarily; Frankliniella fusca (Hinds) Cotton was planted on 3 May 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 RCB design with the middle 2 rows treated with either Temik 15G, or a seed treatment as indicated in the tables. 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 sprayed on treatments 5 through 9 on 24 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 24 and 31 May and on 7 Jun, five cotton seedlings per plot (20 per treatment) were carefully cut off with a razor blade, put into Mason jars filled with soapy water, transported back to NCSU, and processed using the washing/screening technique. Thrips were later counted under a dissecting stereomicroscope and separated into immatures (larvae) and adults. Plant heights were taken on 22 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 5 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 24 May thrips assessment (3 wk after planting), the Avicta Complete Pak + Temik “+ Orthene” treatment showed the lowest level of total thrips numerically, while the Cruiser seed treatment had significantly fewer thrips than the Gaucho Grande treatment, and the other non-check treatments. It should be noted that the Orthene spray had not taken place until after these samples were taken. By 31 May (4 wk after planting), the untreated check had significantly greater numbers of immature and total thrips than all of the other treatments, and all of the non-check treatments were statistically similar. By 7 Jun (5 wk after planting), thrips levels in the untreated check were only 12% of that found 7 d prior, and Avicta Complete Pak alone was the only treatment that showed total thrips levels that were statistically similar to the check. Plant heights in all treatments were significantly (and dramatically) greater than in the untreated check, and the Temik + Orthene treatment showed significantly greater plant heights than the Cruiser + Orthene treatment. Lint yields in all of the treatments were greater than the untreated check. The Avicta Complete Pak + Temik + Orthene and the Avicta Complete Pak + Orthene treatments showed statistically greater yields than Avicta Complete Pak alone and Cruiser + Orthene. No. thrips/5 plants No. thrips/5 plants No. thrips/5 plants Plant ht cm 24 May 31 May 7 Jun (mean/10 Yield plants) (lb lint/acre) Treatment/formulation mg (AI)/seed Immatures Adults Total Immatures Adults Total Immatures Adults Total 22 Jun 5 Oct Check --- 72.8a 20.8a 93.5a 259.3a 8.3a 259.3a 21.8ab 8.8a 30.5ab 23.0c 932.9c Avicta Complete Pak 500 FS 0.15 + 0.52 7.5c 3.0c 10.5c 20.0b 5.3ab 20.0b 15.5b 7.0a 22.5b 48.1ab 1138.0ab + Temik 15G (AI)/acre Avicta Complete Pak 500 FS 0.15 + 0.75 8.3c 5.3c 13.5c 33.8b 5.3ab 33.8b 36.0a 8.8a 44.8a 46.92ab 1108.9b + Temik 15G (AI)/acre Temik 15G 0.75 (AI)/acre 8.8c 2.0c 10.8c 10.8b 1.3b 10.8b 8.5b 10.3a 18.8b 47.66ab 1174.3ab Avicta Complete Pak 500 FS 0.15 + 0.52 4.0c 3.5c 7.5c 7.0b 2.5b 7.0b 16.8b 7.3 24.0b 48.76ab 1214.2a + Temik 15G (AI)/acre+ + Orthene 97SG 0.25 (AI)/acre Avicta Complete Pak 500 FS 0.15 + 0.25 13.3bc 3.3c 16.5c 10.5b 2.8b 10.5b 13.0b 8.5a 21.5b 47.12ab 1210.6a + Orthene 97SG (AI)/acre Temik 15G 0.52 + 0.25 13.8bc 2.8c 16.5c 8.8b 2.0b 8.8b 13.3b 11.8a 25.0b 51.26a 1141.6ab + Orthene 97SG (AI)/acre Cruiser 5FS 0.33 + 0.25 12.3bc 5.0c 17.3c 12.5b 2.3b 12.5b 10.3b 9.0a 19.3b 46.2b 1114.4b + Orthene 97SG (AI)/acre Gaucho Grande 5FS 0.375 + 0.25 25.8b 12.0b 37.8b 22.8b 3.0b 22.8b 9.5b 11.8a 21.3b 47.54ab 1138.0ab + Orthene 97SG (AI)/acre LSD (0.05) 14.62 3.69 16.04 29.95 4.04 29.95 14.83 5.10 15.98 2.276 94.59 Means sharing the same letter are not significantly different (LSD; P = 0.05)

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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