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CALIFORNIA RED SCALE INSECTICIDE EFFICACY TRIAL, 2005

CALIFORNIA RED SCALE INSECTICIDE EFFICACY TRIAL, 2005 (D4) ORANGE: Citrus sinensis (L.) Osbeck, ‘Washington’ navel Elizabeth E. Grafton-Cardwell Department of Entomology, University of California, Riverside, CA 92521 Tel: (559) 646-6591 Fax: (559) 646-6593 bethgc@uckac.edu Christopher A. Reagan California red scale (CRS): Aonidiella aurantii (Maskell) A field trial was conducted to compare the efficacy of Movento, Admire, and Lorsban with an untreated check for the control of CRS in an orchard of 21-yr-old ‘Washington’ navel oranges at the Lindcove Research and Extension Center, Exeter, California. All live 1st and 2nd instar scale as well as 3rd instar and mature female scale were counted on five one- year old twigs (23 cm long) and five fruit (when available) which were randomly selected from each of ten sample trees to determine CRS population density. On 23 May 2005, 12 oz and 16 oz Movento 150 OD and 12 pt Lorsban 4E were applied to foliage diluted in 1000 gpa using a Bean hand-sprayer at 450 psi. Admire 2F at 32.0 oz/acre was applied on 23 May 2005 to the soil under the tree canopy in a 200 ml water dilution per tree with a CO2 backpack sprayer. Application was made directly to the soil surface beneath the tree canopy within the sprinkler wetting zone following 1 hour of irrigation. Trees were irrigated for approximately 2 hours after the Admire application. All fruit was harvested from sample trees on 18 Jan 2006, and evaluated for the total percentage of fruit infested with CRS, the percentage of fruit with > 10 CRS (those more likely to be downgraded due to blemish), fruit number/tree and average fruit weight (lb). Data were analyzed using ANOVA after log (x + 1) of numbers or arcsine square root (x) transformation of percentages and the means were separated according to LSD (P = 0.05). None of the treatments significantly reduced scales on twigs compared to the untreated check (Table 1). Evaluations of fruit in Sep and Oct demonstrated significant CRS reduction in trees treated with Lorsban, Admire, and Movento. Lorsban, Admire, and 16 oz Movento treatments each significantly reduced the percentage of fruit infested with > 10 CRS per fruit (Table 2). Table 1 Mean no. of CRS/ twig Mean no. of CRS/ fruit Treatment/ Rate amt Application formulation product/acre date 13 May 14 Jun 21 Jul 15 Sep 25 Oct Untreated check --- --- 1.0a 3.5a 3.6ab 2.1a 5.0a Lorsban 4E 12.0 pt 23 May 1.1a 1.2a 1.5b 0.3b 0.5b Admire 2F 32.0 oz 25 May 1.0a 3.3a 4.3a 0.1b 0.3b Movento 150 OD 12.0 oz 23 May 1.0a 3.9a 6.0a 0.4b 1.1b Movento 150 OD 16.0 oz 23 May 1.0a 2.0a 2.6ab 0.4b 1.7b Means within a column followed by the same letter are not significantly different (LSD, P < 0.05) after log (x + 1) transformation. Untransformed means are listed. Table 2 Treatment/ Rate amt Application % Fruit infested % Fruit infested Weight (lb)/ Mean no. fruit/ formulation product/acre date w/CRS w/ > 10CRS fruit tree Untreated check --- --- 32.3a 11.4a 0.39ab 822.5 Lorsban 4E 12.0 pt 23 May 15.6c 2.8c 0.42a 765.4 Admire 2F 32.0 oz 25 May 18.8bc 4.0bc 0.38ab 831.6 Movento 150 OD 12.0 oz 23 May 26.7ab 8.5ab 0.37b 885.1 Movento 150 OD 16.0 oz 23 May 21.5bc 5.7bc 0.38ab 789.6 Means within columns not followed by the same letter are significantly different (LSD, P < 0.05) after arcsine (squareroot (x)) transformation of percentages and log (x + 1) transformation of numbers. Untransformed means are listed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CALIFORNIA RED SCALE INSECTICIDE EFFICACY TRIAL, 2005

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/32.1.D4
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Abstract

(D4) ORANGE: Citrus sinensis (L.) Osbeck, ‘Washington’ navel Elizabeth E. Grafton-Cardwell Department of Entomology, University of California, Riverside, CA 92521 Tel: (559) 646-6591 Fax: (559) 646-6593 bethgc@uckac.edu Christopher A. Reagan California red scale (CRS): Aonidiella aurantii (Maskell) A field trial was conducted to compare the efficacy of Movento, Admire, and Lorsban with an untreated check for the control of CRS in an orchard of 21-yr-old ‘Washington’ navel oranges at the Lindcove Research and Extension Center, Exeter, California. All live 1st and 2nd instar scale as well as 3rd instar and mature female scale were counted on five one- year old twigs (23 cm long) and five fruit (when available) which were randomly selected from each of ten sample trees to determine CRS population density. On 23 May 2005, 12 oz and 16 oz Movento 150 OD and 12 pt Lorsban 4E were applied to foliage diluted in 1000 gpa using a Bean hand-sprayer at 450 psi. Admire 2F at 32.0 oz/acre was applied on 23 May 2005 to the soil under the tree canopy in a 200 ml water dilution per tree with a CO2 backpack sprayer. Application was made directly to the soil surface beneath the tree canopy within the sprinkler wetting zone following 1 hour of irrigation. Trees were irrigated for approximately 2 hours after the Admire application. All fruit was harvested from sample trees on 18 Jan 2006, and evaluated for the total percentage of fruit infested with CRS, the percentage of fruit with > 10 CRS (those more likely to be downgraded due to blemish), fruit number/tree and average fruit weight (lb). Data were analyzed using ANOVA after log (x + 1) of numbers or arcsine square root (x) transformation of percentages and the means were separated according to LSD (P = 0.05). None of the treatments significantly reduced scales on twigs compared to the untreated check (Table 1). Evaluations of fruit in Sep and Oct demonstrated significant CRS reduction in trees treated with Lorsban, Admire, and Movento. Lorsban, Admire, and 16 oz Movento treatments each significantly reduced the percentage of fruit infested with > 10 CRS per fruit (Table 2). Table 1 Mean no. of CRS/ twig Mean no. of CRS/ fruit Treatment/ Rate amt Application formulation product/acre date 13 May 14 Jun 21 Jul 15 Sep 25 Oct Untreated check --- --- 1.0a 3.5a 3.6ab 2.1a 5.0a Lorsban 4E 12.0 pt 23 May 1.1a 1.2a 1.5b 0.3b 0.5b Admire 2F 32.0 oz 25 May 1.0a 3.3a 4.3a 0.1b 0.3b Movento 150 OD 12.0 oz 23 May 1.0a 3.9a 6.0a 0.4b 1.1b Movento 150 OD 16.0 oz 23 May 1.0a 2.0a 2.6ab 0.4b 1.7b Means within a column followed by the same letter are not significantly different (LSD, P < 0.05) after log (x + 1) transformation. Untransformed means are listed. Table 2 Treatment/ Rate amt Application % Fruit infested % Fruit infested Weight (lb)/ Mean no. fruit/ formulation product/acre date w/CRS w/ > 10CRS fruit tree Untreated check --- --- 32.3a 11.4a 0.39ab 822.5 Lorsban 4E 12.0 pt 23 May 15.6c 2.8c 0.42a 765.4 Admire 2F 32.0 oz 25 May 18.8bc 4.0bc 0.38ab 831.6 Movento 150 OD 12.0 oz 23 May 26.7ab 8.5ab 0.37b 885.1 Movento 150 OD 16.0 oz 23 May 21.5bc 5.7bc 0.38ab 789.6 Means within columns not followed by the same letter are significantly different (LSD, P < 0.05) after arcsine (squareroot (x)) transformation of percentages and log (x + 1) transformation of numbers. Untransformed means are listed.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2007

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