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RESIDUAL ACTIVITY OF PYRETHROID INSECTICIDES AGAINST GRAPE BERRY MOTH, 2012

RESIDUAL ACTIVITY OF PYRETHROID INSECTICIDES AGAINST GRAPE BERRY MOTH, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.L2 (L2) GRAPE: Vitis labrusca L, ‘Concord’ Keith S. Mason Department of Entomology Michigan State University East Lansing, MI 48824-1115 Tel: (517) 432-9554 Fax: (517) 353-5598 Email: masonk@msu.edu Rufus Isaacs Email: isaacsr@msu.edu Grape berry moth (GBM): Paralobesia viteana (Clemens) The purpose of this study was to evaluate the efficacy of field-aged pyrethroid insecticide residues for the control of grape berry moth. Sixty individual clusters in a commercial Concord vineyard in Van Buren County were treated by dipping for 60 sec in a field rate equivalent insecticide solution of either Baythroid XL (3.2 oz/acre), Brigade 2EC (3.2oz/acre), Danitol EC (10.6oz/acre), Hero EC (5.1 oz/acre), Mustang Max 0.8 EC (4 oz/acre), or an untreated check (water). Solutions were mixed to be equivalent to application using 100 gallons of water per acre. Four clusters of each treatment were removed at 1, 3, or 7 days after treatment. Clusters were removed from the vine and placed in individual 32 oz deli cups with moistened dental wicking and returned to the lab. Grapes with GBM eggs, GBM damage or signs of disease were removed from clusters and discarded. Groups of laboratory reared grape berry moth adults (1:1 male:female sex ratio) were aspirated from a colony housed at Michigan State University. Ten moths per cluster were used for 1 day old residues, but because of colony limitations we used 6 moths per cluster on 3 and 7 day old residues. Moths were then added to each cup and covered with a fine mesh lid. Cups were then placed in an environmental chamber (26 C 16:8 light:dark) with an additional constant incandescent light (15W) and 50% relative humidity. After 48 hours the number of eggs on each cluster was recorded. Strips of plastic were added to the cups for moth pupation and then cups were covered and returned to the environmental chamber to allow surviving larvae to develop. After 6 weeks the number of larvae in each cup that developed to pupae was counted. The number of eggs laid per female and the number of GBM pupae were compared across treatments using the Kruskal Wallis test. The number of eggs per female was significantly reduced by all insecticide treatments on 1 day old residues compared to the untreated control (P=0.02, Table 1). The number of eggs per female was not significantly different than that for the untreated check for 3 day old residues (P=0.21) and this was most likely due to high variability in egglaying within treatment groups. Seven day old residues of all insecticides also significantly reduced egglaying compared to the untreated check (P=0.031). When GBM eggs were laid on aged residues, survival of eggs through to pupae was significantly reduced by all 1 day old insecticide residue treatments compared to the untreated check (P=0.018, Table 2). The number of GBM pupae surviving on grapes treated with any of the insecticides was also significantly lower than that for the untreated check when eggs were laid on 3 day old residues (P=0.022) and 7 day old residues (P=0.022). Although not significantly different from the other treatments, Hero had the highest level of pupal survival (Table 2). These data indicate that the pyrethroids used in this study provide protection to clusters from GBM infestation for at least seven days. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.L2 TABLE 1: Average number of eggs laid per female GBM on clusters with aged insecticide residues. Mean GBM pupae per cluster Treatment (amt product/acre) Solution (ppm AI) 1 day old residue 3 day old residue 7 day old residue Baythroid XL 3.2 fl oz 32 0.4b 0.9a 0.4b Brigade 2EC 3.2 fl oz 62 0.1b 0.0a 0.0b Danitol EC 10.6 fl oz 256 0.2b 0.3a 0.0b Hero EC 5.1 fl oz 60 0.3b 0.1a 0.3b Mustang Max 0.8 EC 4 fl oz 30 0.0b 0.3a 0.1b Untreated check --- 8.0a 14.4a 6.9a Means followed by the same letter in a column are not significantly different (P< 0.05, Kruskal-Wallis test). TABLE 2: Average number of GBM pupae emerging from clusters with aged insecticide residues. Mean GBM pupae per cluster Treatment (amt product/acre) Solution (ppm AI) 1 day old residue 3 day old residue 7 day old residue Baythroid XL 3.2 fl oz 32 0.0b 0.2b 0.0b Brigade 2EC 3.2 fl oz 62 0.0b 0.0b 0.0b Danitol EC 10.6 fl oz 256 0.2b 0.0b 0.2b Hero EC 5.1 fl oz 60 0.0b 0.0b 4.8b Mustang Max 0.8 EC 4 fl oz 30 0.0b 0.2b 0.0b Untreated check --- 17.0a 25.5a 7.2a Means followed by the same letter in a column are not significantly different (P< 0.05, Kruskal-Wallis test). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

RESIDUAL ACTIVITY OF PYRETHROID INSECTICIDES AGAINST GRAPE BERRY MOTH, 2012

Mason, Keith S.; Isaacs, Rufus
Arthropod Management Tests , Volume 38 (1) – Jan 1, 2013
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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.4182/amt.2013.L2
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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.L2 (L2) GRAPE: Vitis labrusca L, ‘Concord’ Keith S. Mason Department of Entomology Michigan State University East Lansing, MI 48824-1115 Tel: (517) 432-9554 Fax: (517) 353-5598 Email: masonk@msu.edu Rufus Isaacs Email: isaacsr@msu.edu Grape berry moth (GBM): Paralobesia viteana (Clemens) The purpose of this study was to evaluate the efficacy of field-aged pyrethroid insecticide residues for the control of grape berry moth. Sixty individual clusters in a commercial Concord vineyard in Van Buren County were treated by dipping for 60 sec in a field rate equivalent insecticide solution of either Baythroid XL (3.2 oz/acre), Brigade 2EC (3.2oz/acre), Danitol EC (10.6oz/acre), Hero EC (5.1 oz/acre), Mustang Max 0.8 EC (4 oz/acre), or an untreated check (water). Solutions were mixed to be equivalent to application using 100 gallons of water per acre. Four clusters of each treatment were removed at 1, 3, or 7 days after treatment. Clusters were removed from the vine and placed in individual 32 oz deli cups with moistened dental wicking and returned to the lab. Grapes with GBM eggs, GBM damage or signs of disease were removed from clusters and discarded. Groups of laboratory reared grape berry moth adults (1:1 male:female sex ratio) were aspirated from a colony housed at Michigan State University. Ten moths per cluster were used for 1 day old residues, but because of colony limitations we used 6 moths per cluster on 3 and 7 day old residues. Moths were then added to each cup and covered with a fine mesh lid. Cups were then placed in an environmental chamber (26 C 16:8 light:dark) with an additional constant incandescent light (15W) and 50% relative humidity. After 48 hours the number of eggs on each cluster was recorded. Strips of plastic were added to the cups for moth pupation and then cups were covered and returned to the environmental chamber to allow surviving larvae to develop. After 6 weeks the number of larvae in each cup that developed to pupae was counted. The number of eggs laid per female and the number of GBM pupae were compared across treatments using the Kruskal Wallis test. The number of eggs per female was significantly reduced by all insecticide treatments on 1 day old residues compared to the untreated control (P=0.02, Table 1). The number of eggs per female was not significantly different than that for the untreated check for 3 day old residues (P=0.21) and this was most likely due to high variability in egglaying within treatment groups. Seven day old residues of all insecticides also significantly reduced egglaying compared to the untreated check (P=0.031). When GBM eggs were laid on aged residues, survival of eggs through to pupae was significantly reduced by all 1 day old insecticide residue treatments compared to the untreated check (P=0.018, Table 2). The number of GBM pupae surviving on grapes treated with any of the insecticides was also significantly lower than that for the untreated check when eggs were laid on 3 day old residues (P=0.022) and 7 day old residues (P=0.022). Although not significantly different from the other treatments, Hero had the highest level of pupal survival (Table 2). These data indicate that the pyrethroids used in this study provide protection to clusters from GBM infestation for at least seven days. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.L2 TABLE 1: Average number of eggs laid per female GBM on clusters with aged insecticide residues. Mean GBM pupae per cluster Treatment (amt product/acre) Solution (ppm AI) 1 day old residue 3 day old residue 7 day old residue Baythroid XL 3.2 fl oz 32 0.4b 0.9a 0.4b Brigade 2EC 3.2 fl oz 62 0.1b 0.0a 0.0b Danitol EC 10.6 fl oz 256 0.2b 0.3a 0.0b Hero EC 5.1 fl oz 60 0.3b 0.1a 0.3b Mustang Max 0.8 EC 4 fl oz 30 0.0b 0.3a 0.1b Untreated check --- 8.0a 14.4a 6.9a Means followed by the same letter in a column are not significantly different (P< 0.05, Kruskal-Wallis test). TABLE 2: Average number of GBM pupae emerging from clusters with aged insecticide residues. Mean GBM pupae per cluster Treatment (amt product/acre) Solution (ppm AI) 1 day old residue 3 day old residue 7 day old residue Baythroid XL 3.2 fl oz 32 0.0b 0.2b 0.0b Brigade 2EC 3.2 fl oz 62 0.0b 0.0b 0.0b Danitol EC 10.6 fl oz 256 0.2b 0.0b 0.2b Hero EC 5.1 fl oz 60 0.0b 0.0b 4.8b Mustang Max 0.8 EC 4 fl oz 30 0.0b 0.2b 0.0b Untreated check --- 17.0a 25.5a 7.2a Means followed by the same letter in a column are not significantly different (P< 0.05, Kruskal-Wallis test).

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2013

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