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FOLIAR APPLICATIONS OF INSECTICIDE FOR TOBACCO BUDWORM AND TOBACCO HORNWORM CONTROL ON TOBACCO IN SOUTH CAROLINA, 2011

FOLIAR APPLICATIONS OF INSECTICIDE FOR TOBACCO BUDWORM AND TOBACCO HORNWORM CONTROL ON TOBACCO IN... Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F91 (F91) TOBACCO: Nicotiana tabacum L. ‘K326’ FOLIAR APPLICATIONS OF INSECTICIDE FOR TOBACCO BUDWORM AND TOBACCO HORNWORM CONTROL ON TOBACCO IN SOUTH CAROLINA, 2011 F. P. F. Reay-Jones Department of Entomology, Soils and Plant Sciences Clemson University Pee Dee Research and Education Center 2200 Pocket Road Florence, SC 29506-9727 Phone: 843-662-3526 ext. 208 Fax: 843-661-5676 E-mail: freayjo@clemson.edu B. A. Fortnum E-mail: bfrtnm@clemson.edu D. T. Gooden E-mail: dgooden@clemson.edu Tobacco budworm (TBW): Heliothis virescens (Fabricius) Tobacco hornworm (THW): Manduca sexta (Linnaeus) A tobacco trial using cultivar ‘K326’ was conducted in 2011 at the Pee Dee Research and Education Center in Florence, SC, to evaluate foliar applications of insecticide for TBW and THW control. The test included untreated and tobacco treated with chlorantraniliprole, flubendiamide, emamectin benzoate, or spinosad. An RBD experiment with four replications was conducted with six treatments and a check. Plots were 2 rows (~26 plants per row) by 40 ft and separated by single unplanted rows. A CO - pressurized back pack sprayer with a Cone Jet T hollow cone nozzle size 10 (30-35 psi) was used to apply tray drench applications of imidacloprid (Admire Pro, 1.2 fl oz / 1000 plants) in ~8.5 fl oz of water/288-plant float tray on 14 Apr, 6 d before transplanting, in all plots except Denim treatments, which received tray drench applications of thiamethoxam (Platinum, 1.3 fl oz / 1000 plants) on the same day. The plants were watered lightly after insecticide application to wash the residue off the plants and into the media. Tobacco was transplanted into field plots on 19 Apr. Recommendations were followed for fertilization, cultivation, topping, weed, and sucker control. A soil nematicide (1,3-dichloropropene) was used on 10 Feb. After transplant, 10 plants per plot were randomly selected and examined on every leaf weekly for live TBW or THW larvae until 8/22/2011. In each plot, plants were classified as having no larva, small hornworm, medium hornworm, large hornworm, small budworm, medium budworm, large budworm, or combinations of sizes of both species. Applications were made when 10% of plants had live larvae present, unless a majority were newly hatched first instars. Foliar applications of insecticide were made with a 3 nozzle (tip DVP 3, Core 25) per row arrangement at 23 gpa and 40PSI with a CO tank. Crop stages were 7 to 10 leaves on 26 May, and 12 leaves on 10 Jun. Green leaf weight of ripe tobacco was taken on the bottom quarter (18 Jul), second quarter (1 Aug), third quarter (16 Aug), and top quarter (5 Sep) portions of five plants on the left row within each plot. Data were analyzed with a one-way ANOVA (PROC MIXED). Proportion of plants infested with larvae was square-root arcsine transformed prior to ANOVA to normalize their distribution. Three applications of Tracer and Denim, two applications of Belt (both rates) and Coragen (both rates) were made. Data are presented in Tables 1 and 2 for each sampling date. Yield was not significantly affected by insecticide treatment (F = 1.50; d.f. = 6, 20; P = 0.2288). Table 1. Plants infested with live TBH or THW (%) Treatment/ formulation Rate (oz / ac) Timing 5/11 5/18 5/25 5/31 6/6 Check - - 0.0a 5.0a 5.0a 10.0a 30.0a Tracer 2 5/25, 6/14, 6/27 0.0a 7.5a 15.0a 2.5a 2.5bc Belt 2 5/25, 6/14 2.5a 2.5a 7.5a 2.5a 2.5bc Belt 3 5/25, 6/14 2.5a 5.0a 15.0a 0.0a 2.5bc Coragen 3.5 5/25, 6/14 2.5a 2.5a 20.0a 2.5a 0.0c Coragen 5 5/25, 6/14 0.0a 5.0a 15.0a 2.5a 7.5abc Denim 10 5/25, 6/6, 6/27 5.0a 7.5a 37.5a 2.5a 20.0ab F 0.43 0.18 1.62 1.27 5.98 P > F 0.8225 0.9802 0.1929 0.3131 0.0010 For each effect, means within the same column followed by the same letter are not significantly different (P = 0.05; Tukey’s [1953] HSD). d.f. = 6, 20. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F91 Table 2 Plants infested with live TBH or THW (%) Treatment/ formulation Rate (oz / ac) Timing 6/14 6/21 6/27 7/5 7/10 Check - - 17.5ab 5.0a 12.5a 5.0a 2.5a Tracer 2 5/25, 6/14, 6/27 37.5a 0.0b 10.0a 5.0a 5.0a Belt 2 5/25, 6/14 25.0ab 0.0b 2.5a 0.0a 0.0a Belt 3 5/25, 6/14 30.0a 0.0b 0.0a 0.0a 0.0a Coragen 3.5 5/25, 6/14 17.5ab 0.0b 2.5a 0.0a 0.0a Coragen 5 5/25, 6/14 15.0ab 0.0b 0.0a 0.0a 0.0a Denim 10 5/25, 6/6, 6/27 0.0b 0.0b 17.5a 2.5a 0.0a F 3.44 3.23 1.87 1.13 1.97 P > F 0.0169 0.0221 0.1371 0.3826 0.1184 For each effect, means within the same column followed by the same letter are not significantly different (P = 0.05; Tukey’s [1953] HSD). d.f. = 6, 20. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

FOLIAR APPLICATIONS OF INSECTICIDE FOR TOBACCO BUDWORM AND TOBACCO HORNWORM CONTROL ON TOBACCO IN SOUTH CAROLINA, 2011

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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F91 (F91) TOBACCO: Nicotiana tabacum L. ‘K326’ FOLIAR APPLICATIONS OF INSECTICIDE FOR TOBACCO BUDWORM AND TOBACCO HORNWORM CONTROL ON TOBACCO IN SOUTH CAROLINA, 2011 F. P. F. Reay-Jones Department of Entomology, Soils and Plant Sciences Clemson University Pee Dee Research and Education Center 2200 Pocket Road Florence, SC 29506-9727 Phone: 843-662-3526 ext. 208 Fax: 843-661-5676 E-mail: freayjo@clemson.edu B. A. Fortnum E-mail: bfrtnm@clemson.edu D. T. Gooden E-mail: dgooden@clemson.edu Tobacco budworm (TBW): Heliothis virescens (Fabricius) Tobacco hornworm (THW): Manduca sexta (Linnaeus) A tobacco trial using cultivar ‘K326’ was conducted in 2011 at the Pee Dee Research and Education Center in Florence, SC, to evaluate foliar applications of insecticide for TBW and THW control. The test included untreated and tobacco treated with chlorantraniliprole, flubendiamide, emamectin benzoate, or spinosad. An RBD experiment with four replications was conducted with six treatments and a check. Plots were 2 rows (~26 plants per row) by 40 ft and separated by single unplanted rows. A CO - pressurized back pack sprayer with a Cone Jet T hollow cone nozzle size 10 (30-35 psi) was used to apply tray drench applications of imidacloprid (Admire Pro, 1.2 fl oz / 1000 plants) in ~8.5 fl oz of water/288-plant float tray on 14 Apr, 6 d before transplanting, in all plots except Denim treatments, which received tray drench applications of thiamethoxam (Platinum, 1.3 fl oz / 1000 plants) on the same day. The plants were watered lightly after insecticide application to wash the residue off the plants and into the media. Tobacco was transplanted into field plots on 19 Apr. Recommendations were followed for fertilization, cultivation, topping, weed, and sucker control. A soil nematicide (1,3-dichloropropene) was used on 10 Feb. After transplant, 10 plants per plot were randomly selected and examined on every leaf weekly for live TBW or THW larvae until 8/22/2011. In each plot, plants were classified as having no larva, small hornworm, medium hornworm, large hornworm, small budworm, medium budworm, large budworm, or combinations of sizes of both species. Applications were made when 10% of plants had live larvae present, unless a majority were newly hatched first instars. Foliar applications of insecticide were made with a 3 nozzle (tip DVP 3, Core 25) per row arrangement at 23 gpa and 40PSI with a CO tank. Crop stages were 7 to 10 leaves on 26 May, and 12 leaves on 10 Jun. Green leaf weight of ripe tobacco was taken on the bottom quarter (18 Jul), second quarter (1 Aug), third quarter (16 Aug), and top quarter (5 Sep) portions of five plants on the left row within each plot. Data were analyzed with a one-way ANOVA (PROC MIXED). Proportion of plants infested with larvae was square-root arcsine transformed prior to ANOVA to normalize their distribution. Three applications of Tracer and Denim, two applications of Belt (both rates) and Coragen (both rates) were made. Data are presented in Tables 1 and 2 for each sampling date. Yield was not significantly affected by insecticide treatment (F = 1.50; d.f. = 6, 20; P = 0.2288). Table 1. Plants infested with live TBH or THW (%) Treatment/ formulation Rate (oz / ac) Timing 5/11 5/18 5/25 5/31 6/6 Check - - 0.0a 5.0a 5.0a 10.0a 30.0a Tracer 2 5/25, 6/14, 6/27 0.0a 7.5a 15.0a 2.5a 2.5bc Belt 2 5/25, 6/14 2.5a 2.5a 7.5a 2.5a 2.5bc Belt 3 5/25, 6/14 2.5a 5.0a 15.0a 0.0a 2.5bc Coragen 3.5 5/25, 6/14 2.5a 2.5a 20.0a 2.5a 0.0c Coragen 5 5/25, 6/14 0.0a 5.0a 15.0a 2.5a 7.5abc Denim 10 5/25, 6/6, 6/27 5.0a 7.5a 37.5a 2.5a 20.0ab F 0.43 0.18 1.62 1.27 5.98 P > F 0.8225 0.9802 0.1929 0.3131 0.0010 For each effect, means within the same column followed by the same letter are not significantly different (P = 0.05; Tukey’s [1953] HSD). d.f. = 6, 20. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F91 Table 2 Plants infested with live TBH or THW (%) Treatment/ formulation Rate (oz / ac) Timing 6/14 6/21 6/27 7/5 7/10 Check - - 17.5ab 5.0a 12.5a 5.0a 2.5a Tracer 2 5/25, 6/14, 6/27 37.5a 0.0b 10.0a 5.0a 5.0a Belt 2 5/25, 6/14 25.0ab 0.0b 2.5a 0.0a 0.0a Belt 3 5/25, 6/14 30.0a 0.0b 0.0a 0.0a 0.0a Coragen 3.5 5/25, 6/14 17.5ab 0.0b 2.5a 0.0a 0.0a Coragen 5 5/25, 6/14 15.0ab 0.0b 0.0a 0.0a 0.0a Denim 10 5/25, 6/6, 6/27 0.0b 0.0b 17.5a 2.5a 0.0a F 3.44 3.23 1.87 1.13 1.97 P > F 0.0169 0.0221 0.1371 0.3826 0.1184 For each effect, means within the same column followed by the same letter are not significantly different (P = 0.05; Tukey’s [1953] HSD). d.f. = 6, 20.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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