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INSECTICIDE EFFICACY IN CONTROL OF WOOLLY APPLE APHIDS, 2012

INSECTICIDE EFFICACY IN CONTROL OF WOOLLY APPLE APHIDS, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.A13 (A13) APPLE: Malus domestica Borkhausen, ‘Gala’ R. A. Van Steenwyk Department of E.S.P.M. 130 Mulford Hall-3114 University of California Berkeley, CA 94720-3114 Telephone: (510) 643-5159 Fax: (510) 643-5438 Email: bobvanst@berkeley.edu C. Wise Email: cwise@berkeley.edu L. M. Novotny Email: lnovotny@berkeley.edu Woolly apple aphid (WAA): Eriosoma lanigerum Hausmann This trial was conducted to evaluate the new insecticide Closer 2SC for controlling WAA. The trial was carried out in a commercial ‘Gala’ apple orchard near Farmington, CA. The orchard was planted on M-111 rootstock with 4.9 m by 2.4 m (row by tree) spacing. Five treatments were replicated four times in a RCB design. Each replicate was a single tree and there was at least one buffer tree between each replicate. All experimental treatments included Dyne-Amic at 0.0625% vol:vol. Treatments were applied on 8 Jun and 31 Jul with a hand-held orchard sprayer operating at 1,723.7 kPa with a finished spray volume of 1870.8 liters/ha. Aerial WAA populations were assessed on a weekly basis from 6 Jun through 7 Sep. WAA populations were assessed over a 1 min period and given an overall infestation rating on a scale of 0 to 6 (Table 1). Data were analyzed using ANOVA and means were separated using Fisher’s protected LSD (P ≤ 0.05). All treatments had significantly lower WAA population infestation as compared to the untreated check (Table 2). The high rate (621.2 ml/ha) of Closer had significantly lower infestation compared to the middle rate (416.5 ml/ha) and low rate (182.7 ml/ha) of Closer and Movento. The middle and low rates of Closer and Movento did not differ significantly. Following harvest on 7 Aug, trees treated with the highest rate of Closer had significantly lower infestation compared to all other treatments. Closer at the high rate shows promise as an effective WAA insecticide. No phytotoxicity was observed with any of the experimental treatments. This research was supported in part by industry gifts of pesticides and research funding. Table 1. Rating Infestation criteria 0 No visible WAA colonies 1 Few colonies, difficult to locate, low in the tree 2 Colonies low density, easy to locate, low in the tree 3 Colonies moderate density, easy to locate, low in the tree 4 Colonies moderate density, easy to locate throughout the tree and not in fruit 5 Colonies moderate density, easy to locate throughout the tree and in fruit 6 Colonies high density, observed throughout the tree and in fruit 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.A13 Table 2. WAA infestation ratings Treatment/ Form./ formulation ha 6 Jun 12 Jun 20 Jun 26 Jun 2 Jul 10 Jul 19 Jul Movento 2SC 657.7 ml 1.3a 1.9a 1.8ab 2.0ab 1.1ab 2.2a 1.6a Closer 2SC 208.3 ml 0.9a 1.9a 1.9ab 2.1bc 1.8bc 2.1a 1.8a Closer 2SC 416.5 ml 1.5a 1.2a 1.6ab 1.3a 2.3c 1.9a 1.7a Closer 2SC 621.2 ml 1.3a 1.4a 1.3a 1.6ab 1.1a 1.9a 1.3a Untreated check 1.0a 2.1a 2.4b 2.9c 3.1d 3.4b 2.8b Means followed by the same letters are not significantly different (P > 0.05) according to Fisher’s LSD. Table 2 continued. Treatment/ Form/ WAA infestation ratings formulation ha 24 Jul 31 Jul 7 Aug 16 Aug 21 Aug 7 Sep Season Avg. Movento 2SC 657.7 ml 1.7a 2.2a 2.4a 2.9b 2.8b 2.6b 2.0b Closer 2SC 208.3 ml 2.3a 2.4a 2.5a 2.8ab 2.9b 2.8b 2.2b Closer 2SC 416.5 ml 2.2a 2.8a 2.4a 3.2bc 3.2b 2.6b 2.1b Closer 2SC 621.2 ml 2.5a 2.0a 2.1a 2.1a 2.1a 1.8a 1.7a Untreated Check 3.0a 3.7b 3.9b 3.8c 4.1c 4.0c 3.1c Means followed by the same letters are not significantly different (P > 0.05) according to Fisher’s LSD. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

INSECTICIDE EFFICACY IN CONTROL OF WOOLLY APPLE APHIDS, 2012

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Oxford University Press
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10.4182/amt.2013.A13
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Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.A13 (A13) APPLE: Malus domestica Borkhausen, ‘Gala’ R. A. Van Steenwyk Department of E.S.P.M. 130 Mulford Hall-3114 University of California Berkeley, CA 94720-3114 Telephone: (510) 643-5159 Fax: (510) 643-5438 Email: bobvanst@berkeley.edu C. Wise Email: cwise@berkeley.edu L. M. Novotny Email: lnovotny@berkeley.edu Woolly apple aphid (WAA): Eriosoma lanigerum Hausmann This trial was conducted to evaluate the new insecticide Closer 2SC for controlling WAA. The trial was carried out in a commercial ‘Gala’ apple orchard near Farmington, CA. The orchard was planted on M-111 rootstock with 4.9 m by 2.4 m (row by tree) spacing. Five treatments were replicated four times in a RCB design. Each replicate was a single tree and there was at least one buffer tree between each replicate. All experimental treatments included Dyne-Amic at 0.0625% vol:vol. Treatments were applied on 8 Jun and 31 Jul with a hand-held orchard sprayer operating at 1,723.7 kPa with a finished spray volume of 1870.8 liters/ha. Aerial WAA populations were assessed on a weekly basis from 6 Jun through 7 Sep. WAA populations were assessed over a 1 min period and given an overall infestation rating on a scale of 0 to 6 (Table 1). Data were analyzed using ANOVA and means were separated using Fisher’s protected LSD (P ≤ 0.05). All treatments had significantly lower WAA population infestation as compared to the untreated check (Table 2). The high rate (621.2 ml/ha) of Closer had significantly lower infestation compared to the middle rate (416.5 ml/ha) and low rate (182.7 ml/ha) of Closer and Movento. The middle and low rates of Closer and Movento did not differ significantly. Following harvest on 7 Aug, trees treated with the highest rate of Closer had significantly lower infestation compared to all other treatments. Closer at the high rate shows promise as an effective WAA insecticide. No phytotoxicity was observed with any of the experimental treatments. This research was supported in part by industry gifts of pesticides and research funding. Table 1. Rating Infestation criteria 0 No visible WAA colonies 1 Few colonies, difficult to locate, low in the tree 2 Colonies low density, easy to locate, low in the tree 3 Colonies moderate density, easy to locate, low in the tree 4 Colonies moderate density, easy to locate throughout the tree and not in fruit 5 Colonies moderate density, easy to locate throughout the tree and in fruit 6 Colonies high density, observed throughout the tree and in fruit 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.A13 Table 2. WAA infestation ratings Treatment/ Form./ formulation ha 6 Jun 12 Jun 20 Jun 26 Jun 2 Jul 10 Jul 19 Jul Movento 2SC 657.7 ml 1.3a 1.9a 1.8ab 2.0ab 1.1ab 2.2a 1.6a Closer 2SC 208.3 ml 0.9a 1.9a 1.9ab 2.1bc 1.8bc 2.1a 1.8a Closer 2SC 416.5 ml 1.5a 1.2a 1.6ab 1.3a 2.3c 1.9a 1.7a Closer 2SC 621.2 ml 1.3a 1.4a 1.3a 1.6ab 1.1a 1.9a 1.3a Untreated check 1.0a 2.1a 2.4b 2.9c 3.1d 3.4b 2.8b Means followed by the same letters are not significantly different (P > 0.05) according to Fisher’s LSD. Table 2 continued. Treatment/ Form/ WAA infestation ratings formulation ha 24 Jul 31 Jul 7 Aug 16 Aug 21 Aug 7 Sep Season Avg. Movento 2SC 657.7 ml 1.7a 2.2a 2.4a 2.9b 2.8b 2.6b 2.0b Closer 2SC 208.3 ml 2.3a 2.4a 2.5a 2.8ab 2.9b 2.8b 2.2b Closer 2SC 416.5 ml 2.2a 2.8a 2.4a 3.2bc 3.2b 2.6b 2.1b Closer 2SC 621.2 ml 2.5a 2.0a 2.1a 2.1a 2.1a 1.8a 1.7a Untreated Check 3.0a 3.7b 3.9b 3.8c 4.1c 4.0c 3.1c Means followed by the same letters are not significantly different (P > 0.05) according to Fisher’s LSD.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2013

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