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SEASONAL ORIENTAL FRUIT MOTH CONTROL WITH DPX-E2Y45 35WG ON NECTARINE, 2006

SEASONAL ORIENTAL FRUIT MOTH CONTROL WITH DPX-E2Y45 35WG ON NECTARINE, 2006 (B4) NECTARINE: Prunus persica L., ‘Fantasia’ Peter W. Shearer Rutgers Agricultural Research and Extension Center 121 Northville Rd Bridgeton, NJ 08302 Phone: (856) 455-3100 Fax: (856) 455-3133 E-mail: shearer@aesop.rutgers.edu Ann Rucker Oriental fruit moth (OFM): Grapholitha molesta (Busck) Leafroller species (LR): Tortricidae spp. Plum curculio (PC): Conotrachelus nenuphar (Herbst) Brown stink bug: Euschistus servus (Say) Dusky stink bug: Euschistus tristigmus (Say) Green stink bug: Acrosternum hilare (Say) Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) This study was conducted on 9-year-old ‘Fantasia’ nectarine trees at the Rutgers Agricultural Research and Extension Center in Bridgeton, NJ. Treatments included DPX-E2Y45 35WG, Imidan 70WP and an untreated check. Imidan 70WP at a 3 lb rate and E2Y45 at 2 and 3 oz rates were sprayed 2X per generation. Application dates and corresponding degree days (DD-base 45°F) from OFM biofix (2 Apr) were 20 Apr (506), 4 May (686), 13 Jun (1537), 29 Jun (2047), 17 Jul (2647), and 31 Jul (3159). E2Y45 at 1 and 2 oz rates were sprayed 3X per generation. Application dates and corresponding degree days (DD-base 45°F) from OFM biofix (2 Apr) were 20 Apr (506), 27Apr (595), 4 May (686), 13 Jun (1537), 21 Jun (1781), 29 Jun (2047), 17 Jul (2647), 24 Jul (2943), and 31 Jul (3159). The experimental treatments were applied to single tree plots replicated four times in a RCBD. Trees were spaced 20 x 20 ft. All applications were made with a Rears Airblast sprayer (28” fan, 180 psi) delivering 100 gpa and pulled through the orchard at 2.6 mph. All trees received regular sprays for disease management. OFM damage to peach shoots was evaluated on 1 Jun, 10 Jul, and 14 Aug by counting the number of damaged shoots (shoot strikes) per tree. Fruit damage at harvest was evaluated on 10 Aug by assessing 25 fruit/tree (100 fruit/treatment). Fruit were scored for various kinds of insect damage. Live larvae in fruit were termed OFM Live. Fruit with either entry holes or frass in the absence of larvae were termed OFM Damage. Feeding damage from TPB and SB were combined and the resulting classification was termed catfacing damage (CF). Pest pressure was high. Fruit damage data were transformed [asin(sqrt(X))] as was shoot strikes [log(X + 1)] before analysis with ANOVA. Treatments means were separated using Tukey’s Honest Significant Difference, at P ≤ 0.05 level. There were no statistical differences between treatments in the number of live OFM larvae found in fruit at harvest but only the 3 oz (2 applications per generation) and the 2 oz (3 applications per generation) treatments had fewer OFM infested fruit than the untreated check (Table 1). The same conclusions can be made for the amount of OFM damaged fruit observed at harvest. Only the Imidan treated fruit had fewer PC egg scars than the untreated check and none of the treatments had less PC feeding damage than the check. None of the treatments were statistically different from each other or the check in terms of CF and LR damage. All treatments provided some level of protection against OFM shoot strikes. No detrimental effects on predatory mites were observed. % damaged fruit OFM PC Avg. no. OFM strikes/tree Treatment/ Rate formulation amt/acre X/gen. Live Damage Egg Feed CF LR 1 Jun 10 Jul 14 Aug DPX-E2Y45 35WG 2.0 oz 2 2.0ab 13.0ab 80.0a 44.0ns 24.0ns 23.0ns 4.5ab 43.5ab 113.0b DPX-E2Y45 35WG 3.0 oz 2 0.0b 4.0b 63.2ab 40.4 32.1 25.1 2.3b 20.5bc 93.3bc DPX-E2Y45 35WG 1.0 oz 3 2.0ab 8.0ab 58.0ab 22.0 23.0 20.0 0.5b 23.3bc 64.3cd DPX-E2Y45 35WG 2.0 oz 3 0.0b 3.0b 71.0ab 31.0 32.0 24.0 1.0b 15.3bc 54.3d Imidan 70WP 3.0 lb 2 2.0ab 8.0ab 34.0b 18.0 29.0 8.0 0.3b 7.8c 66.3cd Untreated check 11.0a 32.0a 80.0a 43.0 38.0 27.0 18.3a 125.0a 238.0a Column means followed by the same letter are not significantly different (Tukey’s Honest Significant Difference, P ≤ 0.05), ns = not significant (ANOVA). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

SEASONAL ORIENTAL FRUIT MOTH CONTROL WITH DPX-E2Y45 35WG ON NECTARINE, 2006

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

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/32.1.B4
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Abstract

(B4) NECTARINE: Prunus persica L., ‘Fantasia’ Peter W. Shearer Rutgers Agricultural Research and Extension Center 121 Northville Rd Bridgeton, NJ 08302 Phone: (856) 455-3100 Fax: (856) 455-3133 E-mail: shearer@aesop.rutgers.edu Ann Rucker Oriental fruit moth (OFM): Grapholitha molesta (Busck) Leafroller species (LR): Tortricidae spp. Plum curculio (PC): Conotrachelus nenuphar (Herbst) Brown stink bug: Euschistus servus (Say) Dusky stink bug: Euschistus tristigmus (Say) Green stink bug: Acrosternum hilare (Say) Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) This study was conducted on 9-year-old ‘Fantasia’ nectarine trees at the Rutgers Agricultural Research and Extension Center in Bridgeton, NJ. Treatments included DPX-E2Y45 35WG, Imidan 70WP and an untreated check. Imidan 70WP at a 3 lb rate and E2Y45 at 2 and 3 oz rates were sprayed 2X per generation. Application dates and corresponding degree days (DD-base 45°F) from OFM biofix (2 Apr) were 20 Apr (506), 4 May (686), 13 Jun (1537), 29 Jun (2047), 17 Jul (2647), and 31 Jul (3159). E2Y45 at 1 and 2 oz rates were sprayed 3X per generation. Application dates and corresponding degree days (DD-base 45°F) from OFM biofix (2 Apr) were 20 Apr (506), 27Apr (595), 4 May (686), 13 Jun (1537), 21 Jun (1781), 29 Jun (2047), 17 Jul (2647), 24 Jul (2943), and 31 Jul (3159). The experimental treatments were applied to single tree plots replicated four times in a RCBD. Trees were spaced 20 x 20 ft. All applications were made with a Rears Airblast sprayer (28” fan, 180 psi) delivering 100 gpa and pulled through the orchard at 2.6 mph. All trees received regular sprays for disease management. OFM damage to peach shoots was evaluated on 1 Jun, 10 Jul, and 14 Aug by counting the number of damaged shoots (shoot strikes) per tree. Fruit damage at harvest was evaluated on 10 Aug by assessing 25 fruit/tree (100 fruit/treatment). Fruit were scored for various kinds of insect damage. Live larvae in fruit were termed OFM Live. Fruit with either entry holes or frass in the absence of larvae were termed OFM Damage. Feeding damage from TPB and SB were combined and the resulting classification was termed catfacing damage (CF). Pest pressure was high. Fruit damage data were transformed [asin(sqrt(X))] as was shoot strikes [log(X + 1)] before analysis with ANOVA. Treatments means were separated using Tukey’s Honest Significant Difference, at P ≤ 0.05 level. There were no statistical differences between treatments in the number of live OFM larvae found in fruit at harvest but only the 3 oz (2 applications per generation) and the 2 oz (3 applications per generation) treatments had fewer OFM infested fruit than the untreated check (Table 1). The same conclusions can be made for the amount of OFM damaged fruit observed at harvest. Only the Imidan treated fruit had fewer PC egg scars than the untreated check and none of the treatments had less PC feeding damage than the check. None of the treatments were statistically different from each other or the check in terms of CF and LR damage. All treatments provided some level of protection against OFM shoot strikes. No detrimental effects on predatory mites were observed. % damaged fruit OFM PC Avg. no. OFM strikes/tree Treatment/ Rate formulation amt/acre X/gen. Live Damage Egg Feed CF LR 1 Jun 10 Jul 14 Aug DPX-E2Y45 35WG 2.0 oz 2 2.0ab 13.0ab 80.0a 44.0ns 24.0ns 23.0ns 4.5ab 43.5ab 113.0b DPX-E2Y45 35WG 3.0 oz 2 0.0b 4.0b 63.2ab 40.4 32.1 25.1 2.3b 20.5bc 93.3bc DPX-E2Y45 35WG 1.0 oz 3 2.0ab 8.0ab 58.0ab 22.0 23.0 20.0 0.5b 23.3bc 64.3cd DPX-E2Y45 35WG 2.0 oz 3 0.0b 3.0b 71.0ab 31.0 32.0 24.0 1.0b 15.3bc 54.3d Imidan 70WP 3.0 lb 2 2.0ab 8.0ab 34.0b 18.0 29.0 8.0 0.3b 7.8c 66.3cd Untreated check 11.0a 32.0a 80.0a 43.0 38.0 27.0 18.3a 125.0a 238.0a Column means followed by the same letter are not significantly different (Tukey’s Honest Significant Difference, P ≤ 0.05), ns = not significant (ANOVA).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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