Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

OBLIQUEBANDED LEAFROLLER CONTROL IN APPLE, 2005

OBLIQUEBANDED LEAFROLLER CONTROL IN APPLE, 2005 (A34) APPLE: Malus domestica Borkhausen, ‘IdaRed’ John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 Phone: (517) 432-2668 Fax: (517) 353-5598 E-mail: wisejohn@msu.edu Kevin Schoenborn E-mail: schoenb6@msu.edu Larry J. Gut E-mail: gut@msu.edu Obliquebanded Leafroller (OBLR): Choristoneura rosaceana (Harris) Leafroller complex (LRC) This trial was designed to help determine the best combination of insecticides, additives, spray volume (gpa), and treatment intervals for control of leafrollers (particularly OBLR) on apple in Michigan. The test materials were applied to mature ‘IdaRed’ apple trees at the Dave Cooper farm located in Coopersville, MI with a tractor-mounted FMC DP50 airblast sprayer calibrated to deliver 50 or 100 gpa at 2.5 mph. One-tree plots were arranged in a RCB design with three replications. Tree spacing was 20 × 20 ft, with a minimum of one buffer tree and one buffer row separating all plots. Regular foliar maintenance applications consisting of Vangard, Flint, and Mora-Leaf 20-20-20 were applied separately to all treatments. In addition, Glyphomax Plus was banded below the trees for weed control and four lbs of 19- 19-19 fertilizer was broadcast under each tree to encourage terminal growth. Applications of test materials targeting overwintering OBLR larvae were made on 18, 25 and 28 May. Summer generation OBLR larvae were treated on 29 Jun, 6, 9, 14 and 20 Jul. Evaluations of overwintering larvae were conducted on 16 May (pre-application), 24 May (7 days after treatment, DAT), 1 Jun (14 DAT), and 7 Jun (21 DAT) by counting the number of live larvae found in a four min search per tree (Table 2.). Larval data is presented as the mean number of live larvae found per plot, and percent control (based control plot before treatment treated on live larvae) was calculated using the Henderson-Tilton formula; % control = [1 – ((n * n plot after treatment control plot after treatment treated plot before treatment )/( n * n ))]*100 (Table 2.). Counts of summer generation larvae yielded very low numbers (terminal growth shut down very early due to a severe drought); therefore, data were not included. Fruit damage was rated prior to normal harvest on 25 Aug by picking 25 apples at random and inspecting for early and mid-season damage from LRC (Table 3.). Fruit data are presented as the percentage of fruit damage caused by overwintering or summer generation larvae. All data were analyzed using ANOVA and means separation by Duncan’s New MRT (P = 0.05). All treatments provided significant control of leafrollers compared to the untreated check (Table 1). Warrior appeared to have the fastest action, whereas Rimon acted more slowly, with counts declining more dramatically after the 7 DAT evaluation (Table 2). The performance of Proclaim did not appear to change with spray volume, but the shorter application interval did improve the control in one instance. The Proclaim/Warrior program was the only treatment to achieve 100% control (Table 2.). Table 1. Overwintering larvae – no. per 4 min search Treatment/ Rate amt Application formulation product/acre timing Pre-treatment 7 DAT 14 DAT 21 DAT Untreated check -- -- 19.3ab 21.0a 13.7a 6.3a Proclaim 5WDG + 4.8 lb + ABDEGH 17.3ab 4.7bcd 0.7bc 2.7ab Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 18.7ab 4.7bc 1.7bc 1.7bc Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 16.7ab 7.7b 3.3b 1.7bc Damoil 0.5% v/v Proclaim 5WDG 4.8 oz + ACDFH 15.3ab 5.3bc 1.7bc 2.3bc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8% v/v + ACDFH 14.0ab 1.3e 2.3bc 3.0ab Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ACDFH 20.0a 2.0de 0.3c 0.7bc Damoil 0.5% v/v Rimon 0.83EC 20 fl oz ACDG 17.7ab 8.7b 2.0bc 1.0bc Proclaim 5WDG + 4.8 oz + ABDEGH 17.0ab 4.7bcd 0.3c 1.7bc Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ABDEGH 15.7ab 1.3e 2.0bc 1.0bc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8 oz + ADG 13.3b 3.3cde 1.3bc 0.0c Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + BEH Latron B1956 0.25% v/v Means followed by same letter do not significantly differ (Duncan’s New MRT, P > 0.05). Statistical analysis performed on square-root transformed data, data presented are actual counts Application timings: A = 18 May (PF); B = 25 May (A+7d); C = 28 May (A+10d); D = 29 Jun (OBLR egg hatch); E = 6 Jul (D+7d); F = 9 Jul (D+10d); G = 14 Jul (D+14d); H = 20 Jul (D+20-21d). Applied at 50 gpa. Table 2. % control (live larvae) Treatment/ Rate amt Application formulation product/acre timing 7 DAT 14 DAT 21 DAT Untreated check -- -- 0.0e 0.0c 0.0d Proclaim 5WDG + 4.8 lb + ABDEGH 75.6bc 94.2ab 44.2c Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 76.7bc 88.7ab 72.5abc Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 57.6cd 72.2b 58.3abc Damoil 0.5% v/v Proclaim 5WDG 4.8 oz + ACDFH 66.7cd 83.9ab 47.4bc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8% v/v + ACDFH 91.5ab 73.8b 44.6bc Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ACDFH 91.3a 97.7a 92.4ab Damoil 0.5% v/v Rimon 0.83EC 20 fl oz ACDG 52.7d 80.5ab 79.4abc Proclaim 5WDG + 4.8 oz + ABDEGH 73.0bcd 97.8a 66.2abc Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ABDEGH 93.1a 80.6ab 87.5abc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8 oz + ADG 77.0bc 85.2ab 100.0a Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + BEH Latron B1956 0.25% v/v Means followed by same letter do not significantly differ (Duncan’s New MRT, P > 0.05). Statistical analysis performed on square-root transformed data, data presented are actual counts Application timings: A = 18 May (PF); B = 25 May (A+7d); C = 28 May (A+10d); D = 29 Jun (OBLR egg hatch); E = 6 Jul (D+7d); F = 9 Jul (D+10d); G = 14 Jul (D+14d); H = 20 Jul (D+20-21d). Applied at 50 gpa. c control plot before treatment Henderson-Tilton formula; % control = [1 – ((n * treated plot after treatment control plot after treatment treated plot before treatment n )/( n * n ))]*100. Table 3. % fruit damaged by – 25 Aug Treatment/ Rate amt Application Overwintering Summer Total formulation product/acre timing larvae larvae larvae Untreated check -- -- 9.3a 9.4a 18.7a Proclaim 5WDG + 4.8 lb + ABDEGH 0.0b 1.3ab 1.3b Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 1.3b 2.7ab 4.0b Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 1.3b 2.7ab 4.0b Damoil 0.5% v/v Proclaim 5WDG 4.8 oz + ACDFH 0.0b 1.3ab 1.3b Latron B1956 0.25% v/v Proclaim 5WDG + 4.8% v/v + ACDFH 0.0b 5.3ab 5.3b Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ACDFH 0.0b 2.0ab 2.0b Damoil 0.5% v/v Rimon 0.83EC 20 fl oz ACDG 4.0ab 1.3ab 5.3b Proclaim 5WDG + 4.8 oz + ABDEGH 0.0b 2.7ab 2.7b Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ABDEGH 1.3b 1.3ab 2.7b Latron B1956 0.25% v/v Proclaim 5WDG + 4.8 oz + ADG 1.3b 0.0b 1.3b Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + BEH Latron B1956 0.25% v/v Means followed by same letter do not significantly differ (Duncan’s New MRT, P > 0.05). Statistical analysis performed on square-root transformed data, data presented are actual counts Application timings: A = 18 May (PF); B = 25 May (A+7d); C = 28 May (A+10d); D = 29 Jun (OBLR egg hatch); E = 6 Jul (D+7d); F = 9 Jul (D+10d); G = 14 Jul (D+14d); H = 20 Jul (D+20-21d). Applied at 50 gpa. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

OBLIQUEBANDED LEAFROLLER CONTROL IN APPLE, 2005

Loading next page...
 
/lp/oxford-university-press/obliquebanded-leafroller-control-in-apple-2005-3u2NNR2PYX
Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/31.1.A34
Publisher site
See Article on Publisher Site

Abstract

(A34) APPLE: Malus domestica Borkhausen, ‘IdaRed’ John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 Phone: (517) 432-2668 Fax: (517) 353-5598 E-mail: wisejohn@msu.edu Kevin Schoenborn E-mail: schoenb6@msu.edu Larry J. Gut E-mail: gut@msu.edu Obliquebanded Leafroller (OBLR): Choristoneura rosaceana (Harris) Leafroller complex (LRC) This trial was designed to help determine the best combination of insecticides, additives, spray volume (gpa), and treatment intervals for control of leafrollers (particularly OBLR) on apple in Michigan. The test materials were applied to mature ‘IdaRed’ apple trees at the Dave Cooper farm located in Coopersville, MI with a tractor-mounted FMC DP50 airblast sprayer calibrated to deliver 50 or 100 gpa at 2.5 mph. One-tree plots were arranged in a RCB design with three replications. Tree spacing was 20 × 20 ft, with a minimum of one buffer tree and one buffer row separating all plots. Regular foliar maintenance applications consisting of Vangard, Flint, and Mora-Leaf 20-20-20 were applied separately to all treatments. In addition, Glyphomax Plus was banded below the trees for weed control and four lbs of 19- 19-19 fertilizer was broadcast under each tree to encourage terminal growth. Applications of test materials targeting overwintering OBLR larvae were made on 18, 25 and 28 May. Summer generation OBLR larvae were treated on 29 Jun, 6, 9, 14 and 20 Jul. Evaluations of overwintering larvae were conducted on 16 May (pre-application), 24 May (7 days after treatment, DAT), 1 Jun (14 DAT), and 7 Jun (21 DAT) by counting the number of live larvae found in a four min search per tree (Table 2.). Larval data is presented as the mean number of live larvae found per plot, and percent control (based control plot before treatment treated on live larvae) was calculated using the Henderson-Tilton formula; % control = [1 – ((n * n plot after treatment control plot after treatment treated plot before treatment )/( n * n ))]*100 (Table 2.). Counts of summer generation larvae yielded very low numbers (terminal growth shut down very early due to a severe drought); therefore, data were not included. Fruit damage was rated prior to normal harvest on 25 Aug by picking 25 apples at random and inspecting for early and mid-season damage from LRC (Table 3.). Fruit data are presented as the percentage of fruit damage caused by overwintering or summer generation larvae. All data were analyzed using ANOVA and means separation by Duncan’s New MRT (P = 0.05). All treatments provided significant control of leafrollers compared to the untreated check (Table 1). Warrior appeared to have the fastest action, whereas Rimon acted more slowly, with counts declining more dramatically after the 7 DAT evaluation (Table 2). The performance of Proclaim did not appear to change with spray volume, but the shorter application interval did improve the control in one instance. The Proclaim/Warrior program was the only treatment to achieve 100% control (Table 2.). Table 1. Overwintering larvae – no. per 4 min search Treatment/ Rate amt Application formulation product/acre timing Pre-treatment 7 DAT 14 DAT 21 DAT Untreated check -- -- 19.3ab 21.0a 13.7a 6.3a Proclaim 5WDG + 4.8 lb + ABDEGH 17.3ab 4.7bcd 0.7bc 2.7ab Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 18.7ab 4.7bc 1.7bc 1.7bc Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 16.7ab 7.7b 3.3b 1.7bc Damoil 0.5% v/v Proclaim 5WDG 4.8 oz + ACDFH 15.3ab 5.3bc 1.7bc 2.3bc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8% v/v + ACDFH 14.0ab 1.3e 2.3bc 3.0ab Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ACDFH 20.0a 2.0de 0.3c 0.7bc Damoil 0.5% v/v Rimon 0.83EC 20 fl oz ACDG 17.7ab 8.7b 2.0bc 1.0bc Proclaim 5WDG + 4.8 oz + ABDEGH 17.0ab 4.7bcd 0.3c 1.7bc Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ABDEGH 15.7ab 1.3e 2.0bc 1.0bc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8 oz + ADG 13.3b 3.3cde 1.3bc 0.0c Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + BEH Latron B1956 0.25% v/v Means followed by same letter do not significantly differ (Duncan’s New MRT, P > 0.05). Statistical analysis performed on square-root transformed data, data presented are actual counts Application timings: A = 18 May (PF); B = 25 May (A+7d); C = 28 May (A+10d); D = 29 Jun (OBLR egg hatch); E = 6 Jul (D+7d); F = 9 Jul (D+10d); G = 14 Jul (D+14d); H = 20 Jul (D+20-21d). Applied at 50 gpa. Table 2. % control (live larvae) Treatment/ Rate amt Application formulation product/acre timing 7 DAT 14 DAT 21 DAT Untreated check -- -- 0.0e 0.0c 0.0d Proclaim 5WDG + 4.8 lb + ABDEGH 75.6bc 94.2ab 44.2c Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 76.7bc 88.7ab 72.5abc Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 57.6cd 72.2b 58.3abc Damoil 0.5% v/v Proclaim 5WDG 4.8 oz + ACDFH 66.7cd 83.9ab 47.4bc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8% v/v + ACDFH 91.5ab 73.8b 44.6bc Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ACDFH 91.3a 97.7a 92.4ab Damoil 0.5% v/v Rimon 0.83EC 20 fl oz ACDG 52.7d 80.5ab 79.4abc Proclaim 5WDG + 4.8 oz + ABDEGH 73.0bcd 97.8a 66.2abc Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ABDEGH 93.1a 80.6ab 87.5abc Latron B1956 0.25% v/v Proclaim 5WDG + 4.8 oz + ADG 77.0bc 85.2ab 100.0a Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + BEH Latron B1956 0.25% v/v Means followed by same letter do not significantly differ (Duncan’s New MRT, P > 0.05). Statistical analysis performed on square-root transformed data, data presented are actual counts Application timings: A = 18 May (PF); B = 25 May (A+7d); C = 28 May (A+10d); D = 29 Jun (OBLR egg hatch); E = 6 Jul (D+7d); F = 9 Jul (D+10d); G = 14 Jul (D+14d); H = 20 Jul (D+20-21d). Applied at 50 gpa. c control plot before treatment Henderson-Tilton formula; % control = [1 – ((n * treated plot after treatment control plot after treatment treated plot before treatment n )/( n * n ))]*100. Table 3. % fruit damaged by – 25 Aug Treatment/ Rate amt Application Overwintering Summer Total formulation product/acre timing larvae larvae larvae Untreated check -- -- 9.3a 9.4a 18.7a Proclaim 5WDG + 4.8 lb + ABDEGH 0.0b 1.3ab 1.3b Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 1.3b 2.7ab 4.0b Damoil 0.5% v/v Proclaim 5WDG + 4.8 oz + ACDFH 1.3b 2.7ab 4.0b Damoil 0.5% v/v Proclaim 5WDG 4.8 oz + ACDFH 0.0b 1.3ab 1.3b Latron B1956 0.25% v/v Proclaim 5WDG + 4.8% v/v + ACDFH 0.0b 5.3ab 5.3b Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ACDFH 0.0b 2.0ab 2.0b Damoil 0.5% v/v Rimon 0.83EC 20 fl oz ACDG 4.0ab 1.3ab 5.3b Proclaim 5WDG + 4.8 oz + ABDEGH 0.0b 2.7ab 2.7b Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + ABDEGH 1.3b 1.3ab 2.7b Latron B1956 0.25% v/v Proclaim 5WDG + 4.8 oz + ADG 1.3b 0.0b 1.3b Latron B1956 0.25% v/v Warrior Z 1CS + 5 fl oz + BEH Latron B1956 0.25% v/v Means followed by same letter do not significantly differ (Duncan’s New MRT, P > 0.05). Statistical analysis performed on square-root transformed data, data presented are actual counts Application timings: A = 18 May (PF); B = 25 May (A+7d); C = 28 May (A+10d); D = 29 Jun (OBLR egg hatch); E = 6 Jul (D+7d); F = 9 Jul (D+10d); G = 14 Jul (D+14d); H = 20 Jul (D+20-21d). Applied at 50 gpa.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2006

There are no references for this article.