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EVALUATION OF INSECTICIDES AGAINST GREEN CLOVERWORM AND SOYBEAN LOOPER, 2001

EVALUATION OF INSECTICIDES AGAINST GREEN CLOVERWORM AND SOYBEAN LOOPER, 2001 (F98) SOYBEAN: Glycine max (L.) Merrill, 'Hornbeck 6600' EVALUATION OF INSECTICIDES AGAINST GREEN CLOVERWORM AND SOYBEAN LOOPER, 2001 B. J. Fitzpatrick, M. M. Willrich, and D. J. Boethel LSU Agricultural Center Department of Entomology 404 Life Sciences Building Baton Rouge, LA 70803-1710 Phone: (225) 578-1634 Fax: (225) 578-1643 E-mail: bfitzpatrick@agctr.lsu.edu R. H. Gable and B. R. Leonard LSU Agricultural Center Northeast Research Station Macon Ridge Location 212 Macon Ridge Rd. Winnsboro, LA 71295 Green cloverworm (GCW): Plathypena scabra (F.) Soybean looper (SBL): Pseudoplusia includens (Walker) Efficacy of standard and experimental insecticides against green cloverworm (GCW) and soybean looper (SBL) was evaluated in two small-plot trials conducted near Winnsboro, LA (Franklin Parish). Treatments for both tests were applied on 21 Aug with a tractor-mounted sprayer calibrated to deliver 10 gpa at 30 psi through TeeJet 8002 flat fan nozzles (two/row). Plots were 50 ft ´ 4 rows (40-inches centered). Treatments were arranged in a RCB design with four replications. Samples (25 sweeps/plot) were taken with a standard (15-inches diameter) sweep net at 3 and 8 DAT. Tests received 1.33 inches of rainfall on 28 Aug. Data were analyzed with ANOVA and means separated by DMRT. GCW pretreatment densities were low, but SBL pretreatment densities were near Louisiana's action threshold (≥ 38 SBL/25 sweeps). In both tests, all insecticide treatments significantly reduced GCW and SBL densities compared with the untreated check at 3 and 8 DAT. Densities of GCW remained relatively constant during the study period. At 8 DAT, SBL densities decreased in the untreated check by two-thirds in Test 1 and by half in Test 2. No significant differences between insecticide treatments for GCW control were observed in Test 1 or 2 at 3 or 8 DAT. In Test 1, Larvin treated plots had significantly fewer SBL larvae than plots treated with Ketch DF, Denim, or Tracer (0.0312 lb(AI)/acre) at 3 DAT. At 8 DAT, plots treated with Intrepid (0.06 and 0.09 lb(AI)/acre) had significantly fewer SBL larvae than plots treated with Ketch DF or Tracer (0.0312 lb(AI)/acre). In Test 2 at 3 DAT, plots treated with Steward (0.075 lb(AI)/acre) had significantly fewer SBL larvae than plots treated with any of the other insecticides and the untreated plots. Steward (0.065 lb(AI)/acre) and Larvin treated plots had significantly fewer SBL larvae than the plots treated with Tracer + Orthene or untreated plots. At 8 DAT, plots treated with Steward (0.065 lb(AI)/acre) or Larvin had significantly fewer SBL larvae than plots treated with Tracer, Tracer + Orthene, or the untreated plots. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF INSECTICIDES AGAINST GREEN CLOVERWORM AND SOYBEAN LOOPER, 2001

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/27.1.F98
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Abstract

(F98) SOYBEAN: Glycine max (L.) Merrill, 'Hornbeck 6600' EVALUATION OF INSECTICIDES AGAINST GREEN CLOVERWORM AND SOYBEAN LOOPER, 2001 B. J. Fitzpatrick, M. M. Willrich, and D. J. Boethel LSU Agricultural Center Department of Entomology 404 Life Sciences Building Baton Rouge, LA 70803-1710 Phone: (225) 578-1634 Fax: (225) 578-1643 E-mail: bfitzpatrick@agctr.lsu.edu R. H. Gable and B. R. Leonard LSU Agricultural Center Northeast Research Station Macon Ridge Location 212 Macon Ridge Rd. Winnsboro, LA 71295 Green cloverworm (GCW): Plathypena scabra (F.) Soybean looper (SBL): Pseudoplusia includens (Walker) Efficacy of standard and experimental insecticides against green cloverworm (GCW) and soybean looper (SBL) was evaluated in two small-plot trials conducted near Winnsboro, LA (Franklin Parish). Treatments for both tests were applied on 21 Aug with a tractor-mounted sprayer calibrated to deliver 10 gpa at 30 psi through TeeJet 8002 flat fan nozzles (two/row). Plots were 50 ft ´ 4 rows (40-inches centered). Treatments were arranged in a RCB design with four replications. Samples (25 sweeps/plot) were taken with a standard (15-inches diameter) sweep net at 3 and 8 DAT. Tests received 1.33 inches of rainfall on 28 Aug. Data were analyzed with ANOVA and means separated by DMRT. GCW pretreatment densities were low, but SBL pretreatment densities were near Louisiana's action threshold (≥ 38 SBL/25 sweeps). In both tests, all insecticide treatments significantly reduced GCW and SBL densities compared with the untreated check at 3 and 8 DAT. Densities of GCW remained relatively constant during the study period. At 8 DAT, SBL densities decreased in the untreated check by two-thirds in Test 1 and by half in Test 2. No significant differences between insecticide treatments for GCW control were observed in Test 1 or 2 at 3 or 8 DAT. In Test 1, Larvin treated plots had significantly fewer SBL larvae than plots treated with Ketch DF, Denim, or Tracer (0.0312 lb(AI)/acre) at 3 DAT. At 8 DAT, plots treated with Intrepid (0.06 and 0.09 lb(AI)/acre) had significantly fewer SBL larvae than plots treated with Ketch DF or Tracer (0.0312 lb(AI)/acre). In Test 2 at 3 DAT, plots treated with Steward (0.075 lb(AI)/acre) had significantly fewer SBL larvae than plots treated with any of the other insecticides and the untreated plots. Steward (0.065 lb(AI)/acre) and Larvin treated plots had significantly fewer SBL larvae than the plots treated with Tracer + Orthene or untreated plots. At 8 DAT, plots treated with Steward (0.065 lb(AI)/acre) or Larvin had significantly fewer SBL larvae than plots treated with Tracer, Tracer + Orthene, or the untreated plots.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2002

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