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Plum Curculio (PC): Conotrachelus nenuphar (Herbst) , Oriental fruit moth (OFM): Grapholitha molesta (Busck)
diflubenzuron, cyantraniliprole, cyclaniliprole

The objective of this trial was to evaluate the efficacy of season-long insecticide spray programs for OFM in peach and any secondary benefit these programs could have on PC. Single-tree plots were established in a 9-year-old planting of 'Red Haven' peach trees with row spacing of 20′ × 18′; located at the Trevor Nichols Research Center in Fennville, MI. Treatments were replicated four times in an RCB design with at least one buffer tree separating all plots. We made six applications of each test material at 14-day intervals beginning at petal fall on 20 May. All treatments were applied using an FMC 1029 tractor-mounted airblast sprayer calibrated to deliver 100 GPA at 2.5 mph.

Early season OFM injury to terminals (flagging) was evaluated on 3 and 12 June by examining 100 terminals per plot. OFM fruit injury was evaluated on 14 Jul by examining 100 fruit for entries. PC fruit injury was evaluated on 14 Jul by examining 100 fruit per plot for stings. OFM fruit injury was evaluated on 18 Aug by examining 100 fruit per plot for entries. An OFM fruit harvest evaluation took place on 19 Aug by examining 100 fruit per plot for OFM entries. Data for each plot were converted to % damage and transformed data (square root + 0.5) were analyzed by ANOVA with means separation by Tukey’s HSD at P  = 0.05.

None of the treatments showed statistically significant control of OFM flagging compared to the untreated check ( Table 1 ). Only the 22 oz rate of cyclaniliprole provided significant protection from OFM fruit injury in the 14 Jul evaluation. All treatments significantly reduced the incidence of OFM fruit injury at harvest. Treatments had no effect on PC.

Treatment/formulationRate form. product/acre Appl. timing a OFM
PC
% Foliar flagging
% Fruit damage
% Fruit stings
3-JunJune 12 July 14 b18-AugHarvest Aug 1914-Jul
Untreated check2.5 a7.0 a6.8 a5.0 a10.3 a10.8 a
Dimilin 2 L16 fl ozABCDEF0.8 a6.3 a2.8 ab2.0 a2.3 b5.5 a
Cyclaniliprole 50 SL16.4 fl ozABCDEF0.0 a4.0 a1.3 ab4.3 a0.3 b9.8 a
Cyclaniliprole 50 SL22 fl ozABCDEF0.8 a2.8 a0.0 b3.0 a0.5 b12.3 a
Exirel 0.83 SE13.5 fl ozABCDEF1.0 a4.0 a0.8 ab2.5 a0.0 b5.8 a
Treatment/formulationRate form. product/acre Appl. timing a OFM
PC
% Foliar flagging
% Fruit damage
% Fruit stings
3-JunJune 12 July 14 b18-AugHarvest Aug 1914-Jul
Untreated check2.5 a7.0 a6.8 a5.0 a10.3 a10.8 a
Dimilin 2 L16 fl ozABCDEF0.8 a6.3 a2.8 ab2.0 a2.3 b5.5 a
Cyclaniliprole 50 SL16.4 fl ozABCDEF0.0 a4.0 a1.3 ab4.3 a0.3 b9.8 a
Cyclaniliprole 50 SL22 fl ozABCDEF0.8 a2.8 a0.0 b3.0 a0.5 b12.3 a
Exirel 0.83 SE13.5 fl ozABCDEF1.0 a4.0 a0.8 ab2.5 a0.0 b5.8 a

Means followed by same letter do not significantly differ ( P  =   0.05, Tukey’s HSD)

ANOVA performed on square-root transformed data; original means are shown

a A = 20 May (Petal Fall), B = 3 June (A + 14 Days), C = 17 June (B + 14 Days), D = 1 July (C + 14 Days), E = 15 July (D + 14 Days), F = 31 July (E + 14 Days)

b ANOVA may not be valid as the data failed Bartlett's test for homogeneity

Treatment/formulationRate form. product/acre Appl. timing a OFM
PC
% Foliar flagging
% Fruit damage
% Fruit stings
3-JunJune 12 July 14 b18-AugHarvest Aug 1914-Jul
Untreated check2.5 a7.0 a6.8 a5.0 a10.3 a10.8 a
Dimilin 2 L16 fl ozABCDEF0.8 a6.3 a2.8 ab2.0 a2.3 b5.5 a
Cyclaniliprole 50 SL16.4 fl ozABCDEF0.0 a4.0 a1.3 ab4.3 a0.3 b9.8 a
Cyclaniliprole 50 SL22 fl ozABCDEF0.8 a2.8 a0.0 b3.0 a0.5 b12.3 a
Exirel 0.83 SE13.5 fl ozABCDEF1.0 a4.0 a0.8 ab2.5 a0.0 b5.8 a
Treatment/formulationRate form. product/acre Appl. timing a OFM
PC
% Foliar flagging
% Fruit damage
% Fruit stings
3-JunJune 12 July 14 b18-AugHarvest Aug 1914-Jul
Untreated check2.5 a7.0 a6.8 a5.0 a10.3 a10.8 a
Dimilin 2 L16 fl ozABCDEF0.8 a6.3 a2.8 ab2.0 a2.3 b5.5 a
Cyclaniliprole 50 SL16.4 fl ozABCDEF0.0 a4.0 a1.3 ab4.3 a0.3 b9.8 a
Cyclaniliprole 50 SL22 fl ozABCDEF0.8 a2.8 a0.0 b3.0 a0.5 b12.3 a
Exirel 0.83 SE13.5 fl ozABCDEF1.0 a4.0 a0.8 ab2.5 a0.0 b5.8 a

Means followed by same letter do not significantly differ ( P  =   0.05, Tukey’s HSD)

ANOVA performed on square-root transformed data; original means are shown

a A = 20 May (Petal Fall), B = 3 June (A + 14 Days), C = 17 June (B + 14 Days), D = 1 July (C + 14 Days), E = 15 July (D + 14 Days), F = 31 July (E + 14 Days)

b ANOVA may not be valid as the data failed Bartlett's test for homogeneity

* This research was supported by industry gift(s) of pesticides and/or research funding.

Author notes

Section Editor: David Haviland

© The Authors 2016. Published by Oxford University Press on behalf of Entomological Society of America.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0/ ), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact [email protected]
Issue Section:
Section B: Stone Fruits
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