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SWEETPOTATO FLEA BEETLE, WHITEFRINGED BEETLE, JAPANESE BEETLE, AND WIREWORM CONTROL WITH INSECTICIDES, 2004

SWEETPOTATO FLEA BEETLE, WHITEFRINGED BEETLE, JAPANESE BEETLE, AND WIREWORM CONTROL WITH... (E78) SWEET POTATO: Ipomoea batatas (L.) Lam, ‘Beauregard’ SWEETPOTATO FLEA BEETLE, WHITEFRINGED BEETLE, JAPANESE BEETLE, AND WIREWORM CONTROL WITH INSECTICIDES, 2004 Kenneth A. Sorensen Department of Entomology North Carolina State University Raleigh, NC 27695-7626 Phone: (919) 515-1662 Fax: (919) 515-7273 E-mail: kenneth_sorensen@ncsu.edu Dennis G. Cooke E-mail: dennis_cooke@ncsu.edu Sweetpotato flea beetle (FB): Chaetocnema confinis Crotch Whitefringed beetle (WFB): Graphognathus spp. Japanese beetle (JB): Popillia japonica Newman Wireworm (WW): Melanotus communis Gyllenhal and Conoderus spp. ‘Beauregard’ sweet potatoes were transplanted on 14 Jun at the Cunningham Research Station, Lenoir County, North Carolina. Plots consisted of three rows 20 ft long on 42-inch centers, arranged in a RCB design and replicated four times. Alleys of 10 ft were used between replications. Granular formulated pre- plant treatments were applied as a 12-inch band and covered with soil, using shaker jars to broadcast granular materials over the rows. Liquid pre-plant treatments were broadcast using a CO -pressurized backpack sprayer using a single hollow cone nozzle (18×) operating at 60 psi to deliver 54.5 gpa, and incorporated with a tractor driven rototiller to a depth of 6 inches. Treatments applied at planting were applied with the transplant water at a volume of 0.5 gal of water/60 ft row. Lay-by and foliar treatments were applied using a CO -pressurized backpack sprayer using a single hollow cone nozzle (18×) operating at 60 psi to deliver 54.5 gpa, and incorporated with a tractor driven rototiller to a depth of 6 inches. Sweet potatoes were harvested on 1 Oct. Harvest data was taken from a 10-ft section of sweet potatoes out of a 20-ft row from a three row planting of four replications. The middle row was graded and yield data was recorded. Fifteen sub-samples of No. 1 grade root were collected, taken to the lab, and scored for FB, WW, WFB, and WG damage. Data were subjected to ANOVA and means were separated using LSD (P ≤ 0.05). Foliar damage ratings were taken 14 Sep and made on insects feeding on the foliage (Table 1). WW pressure was high, FB pressure was low to moderate, and JB and WFB were low. Significant differences were observed in all categories except for mean total yield and mean percent damage to WFB and JB (Table 2). No phytotoxicity was observed in this test. Table 1. % insect damaged sweet potatoes Treatment/ Rate amt Application formulation product/acre timing Application date(s) FB WFB JB WW Empower 2G 7 lb Pre-plant 9 Jun 0.5bc 0.0a 0.0a 7.0b Capture 2EC 19.2 fl oz Pre-plant 9 Jun 1.0b 0.0a 0.0a 6.3b Admire 2F 1 pt Planting 14 Jun 0.8b 0.0a 0.3a 8.5a Capture 2EC 19.2 fl oz Pre-plant 9 Jun 0.0c 0.3a 1.8a 8.0a Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6 Jul Capture 2EC 3.2 fl oz Foliar 26 Aug, 14 Sep Agenda 1.67SC 8 fl oz Planting 14 Jun 1.5b 0.0a 0.0a 5.8bc Capture 2EC 19.2 fl oz Pre-plant 9 Jun 0.0c 0.3a 1.0a 3.5c Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6, 13 Jul Capture 2EC 3.2 fl oz Foliar 26 Aug Empower 2G 10 lb Pre-plant 9 Jun 1.3b 0.3a 0.3a 11.8a Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6 Jul 0.3c 0.0a 1.3a 8.3a Aztec 2.1G 14 lb Pre-plant 9 Jun 3.3a 0.0a 0.5a 11.8a Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6, 13 Jul 0.0c 0.5a 0.5a 9.3a Capture 2EC 3.2 fl oz Foliar 26 Aug Clutch 16WG 1 lb Pre-plant 9 Jun 2.8ab 0.5a 0.3a 8.0a Untreated check -- -- -- 4.5a 0.0a 0.3a 12.0a Means within a column followed by the same letter are not significantly different (P > 0.05, LSD). Applied as a 12-inch band and covered with soil, using shaker jars. Applied broadcast and incorporated with a tractor driven rototiller to a depth of 6 inches. Applied as a drench with transplant water at 0.5 gal water/60 ft row. Applied as a lay-by spray and incorporated with a tractor driven rototiller to a depth of 6 inches. Table 2. % roots Foliage Treatment/ Rate amt Total damage a b formulation product/acre Damaged Undamaged Marketable yield (lb) rating Empower 2G 7 lb 46.5b 53.5a 71.8a 24.6a 3.0b Capture 2EC 19.2 fl oz 46.8b 53.3a 75.0a 24.7a 2.8b Admire 2F 1 pt 56.8b 43.3ab 59.8a 26.4a 2.8b Capture 2EC 19.2 fl oz 65.3a 34.8b 49.8b 22.6a 1.5c Capture 2EC 3.2 fl oz Capture 2EC 3.2 fl oz Agenda 1.67SC 8 fl oz 41.5bc 58.5a 71.5a 21.8a 3.0b Capture 2EC 19.2 fl oz 30.0c 70.0a 78.3a 25.9a 1.3c Capture 2EC 3.2 fl oz Capture 2EC 3.2 fl oz Empower 2G 10 lb 78.3a 33.3b 31.5b 25.8a 2.0bc Capture 2EC 3.2 fl oz 61.8a 25.0b 60.0a 29.2a 1.8c Aztec 2.1G 14 lb 78.5a 21.5bc 48.3b 25.3a 2.3b Capture 2EC 3.2 fl oz 63.3a 36.8b 55.0ab 24.4a 1.8c Capture 2EC 3.2 fl oz Clutch 16WG 1 lb 60.0ab 40.0b 61.8a 26.3a 2.3b Untreated check -- 85.0a 13.3c 35.0b 24.5a 5.5a Means within a column followed by the same letter are not significantly different (P > 0.05, LSD). See Table 1 for application timings and application dates. Damage rating 0-10; 1 = 10% and 10 = 100% defoliation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

SWEETPOTATO FLEA BEETLE, WHITEFRINGED BEETLE, JAPANESE BEETLE, AND WIREWORM CONTROL WITH INSECTICIDES, 2004

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2155-9856
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10.1093/amt/30.1.E78
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Abstract

(E78) SWEET POTATO: Ipomoea batatas (L.) Lam, ‘Beauregard’ SWEETPOTATO FLEA BEETLE, WHITEFRINGED BEETLE, JAPANESE BEETLE, AND WIREWORM CONTROL WITH INSECTICIDES, 2004 Kenneth A. Sorensen Department of Entomology North Carolina State University Raleigh, NC 27695-7626 Phone: (919) 515-1662 Fax: (919) 515-7273 E-mail: kenneth_sorensen@ncsu.edu Dennis G. Cooke E-mail: dennis_cooke@ncsu.edu Sweetpotato flea beetle (FB): Chaetocnema confinis Crotch Whitefringed beetle (WFB): Graphognathus spp. Japanese beetle (JB): Popillia japonica Newman Wireworm (WW): Melanotus communis Gyllenhal and Conoderus spp. ‘Beauregard’ sweet potatoes were transplanted on 14 Jun at the Cunningham Research Station, Lenoir County, North Carolina. Plots consisted of three rows 20 ft long on 42-inch centers, arranged in a RCB design and replicated four times. Alleys of 10 ft were used between replications. Granular formulated pre- plant treatments were applied as a 12-inch band and covered with soil, using shaker jars to broadcast granular materials over the rows. Liquid pre-plant treatments were broadcast using a CO -pressurized backpack sprayer using a single hollow cone nozzle (18×) operating at 60 psi to deliver 54.5 gpa, and incorporated with a tractor driven rototiller to a depth of 6 inches. Treatments applied at planting were applied with the transplant water at a volume of 0.5 gal of water/60 ft row. Lay-by and foliar treatments were applied using a CO -pressurized backpack sprayer using a single hollow cone nozzle (18×) operating at 60 psi to deliver 54.5 gpa, and incorporated with a tractor driven rototiller to a depth of 6 inches. Sweet potatoes were harvested on 1 Oct. Harvest data was taken from a 10-ft section of sweet potatoes out of a 20-ft row from a three row planting of four replications. The middle row was graded and yield data was recorded. Fifteen sub-samples of No. 1 grade root were collected, taken to the lab, and scored for FB, WW, WFB, and WG damage. Data were subjected to ANOVA and means were separated using LSD (P ≤ 0.05). Foliar damage ratings were taken 14 Sep and made on insects feeding on the foliage (Table 1). WW pressure was high, FB pressure was low to moderate, and JB and WFB were low. Significant differences were observed in all categories except for mean total yield and mean percent damage to WFB and JB (Table 2). No phytotoxicity was observed in this test. Table 1. % insect damaged sweet potatoes Treatment/ Rate amt Application formulation product/acre timing Application date(s) FB WFB JB WW Empower 2G 7 lb Pre-plant 9 Jun 0.5bc 0.0a 0.0a 7.0b Capture 2EC 19.2 fl oz Pre-plant 9 Jun 1.0b 0.0a 0.0a 6.3b Admire 2F 1 pt Planting 14 Jun 0.8b 0.0a 0.3a 8.5a Capture 2EC 19.2 fl oz Pre-plant 9 Jun 0.0c 0.3a 1.8a 8.0a Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6 Jul Capture 2EC 3.2 fl oz Foliar 26 Aug, 14 Sep Agenda 1.67SC 8 fl oz Planting 14 Jun 1.5b 0.0a 0.0a 5.8bc Capture 2EC 19.2 fl oz Pre-plant 9 Jun 0.0c 0.3a 1.0a 3.5c Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6, 13 Jul Capture 2EC 3.2 fl oz Foliar 26 Aug Empower 2G 10 lb Pre-plant 9 Jun 1.3b 0.3a 0.3a 11.8a Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6 Jul 0.3c 0.0a 1.3a 8.3a Aztec 2.1G 14 lb Pre-plant 9 Jun 3.3a 0.0a 0.5a 11.8a Capture 2EC 3.2 fl oz Lay-by 29 Jun, 6, 13 Jul 0.0c 0.5a 0.5a 9.3a Capture 2EC 3.2 fl oz Foliar 26 Aug Clutch 16WG 1 lb Pre-plant 9 Jun 2.8ab 0.5a 0.3a 8.0a Untreated check -- -- -- 4.5a 0.0a 0.3a 12.0a Means within a column followed by the same letter are not significantly different (P > 0.05, LSD). Applied as a 12-inch band and covered with soil, using shaker jars. Applied broadcast and incorporated with a tractor driven rototiller to a depth of 6 inches. Applied as a drench with transplant water at 0.5 gal water/60 ft row. Applied as a lay-by spray and incorporated with a tractor driven rototiller to a depth of 6 inches. Table 2. % roots Foliage Treatment/ Rate amt Total damage a b formulation product/acre Damaged Undamaged Marketable yield (lb) rating Empower 2G 7 lb 46.5b 53.5a 71.8a 24.6a 3.0b Capture 2EC 19.2 fl oz 46.8b 53.3a 75.0a 24.7a 2.8b Admire 2F 1 pt 56.8b 43.3ab 59.8a 26.4a 2.8b Capture 2EC 19.2 fl oz 65.3a 34.8b 49.8b 22.6a 1.5c Capture 2EC 3.2 fl oz Capture 2EC 3.2 fl oz Agenda 1.67SC 8 fl oz 41.5bc 58.5a 71.5a 21.8a 3.0b Capture 2EC 19.2 fl oz 30.0c 70.0a 78.3a 25.9a 1.3c Capture 2EC 3.2 fl oz Capture 2EC 3.2 fl oz Empower 2G 10 lb 78.3a 33.3b 31.5b 25.8a 2.0bc Capture 2EC 3.2 fl oz 61.8a 25.0b 60.0a 29.2a 1.8c Aztec 2.1G 14 lb 78.5a 21.5bc 48.3b 25.3a 2.3b Capture 2EC 3.2 fl oz 63.3a 36.8b 55.0ab 24.4a 1.8c Capture 2EC 3.2 fl oz Clutch 16WG 1 lb 60.0ab 40.0b 61.8a 26.3a 2.3b Untreated check -- 85.0a 13.3c 35.0b 24.5a 5.5a Means within a column followed by the same letter are not significantly different (P > 0.05, LSD). See Table 1 for application timings and application dates. Damage rating 0-10; 1 = 10% and 10 = 100% defoliation.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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