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Citricola Scale Insecticide Trial, 2014

Citricola Scale Insecticide Trial, 2014 Arthropod Management Tests, 2016, 1–2 doi: 10.1093/amt/tsw005 Section D: Citrus, Nuts, and Other Tree Fruits ORANGE: Citrus sinensis (L.) Osbeck, ‘Parent’ Navel Elizabeth E. Grafton-Cardwell, Sara J. Scott, and Jamie N. Nemecek Department of Entomology, University of California, Riverside, CA 92521, Phone: (559) 592-2408, Fax: (559) 592-5947 (eegraftoncardwell@ucanr.edu; sascott@ucanr.edu; jnnemecek@ucanr.edu) and Corresponding author, e-mail: eegraftoncardwell@ucanr.edu Subject Editor: David Haviland Orange | Citrus sinensis citricola scale | Coccus pseudomagnoliarum Citricola scale causes loss of tree vigor, yield reduction and down- after the 15 Aug treatment. Post-treatment sampling consisted of grading of fruit in the packing house due to sooty mold growth on counts of first-instar citricola nymphs infesting five leaves collected honeydew deposited by the insect. A field trial was conducted in a from the NE corner of each sample tree during Aug through Oct 22-yr-old ‘Parent’ navel orange orchard at the Lindcove Research 2014. An additional sample of mature female citricola on five twigs and Extension Center, Exeter, California to compare various tim- per tree was collected on 21 Apr 2015. Mean numbers of scales per ings and rates of insecticides for efficacy against citricola scale. twig or leaf were compared between treatments using ANOVA after Insecticides were applied diluted in 100 or 300 gpa of water to 8 log (xþ 1) transformation of numbers and the means were sepa- trees per treatment using a 100 gal high pressure D30 diaphragm rated according to the Fisher’s LSD test (P¼ 0.05). pump sprayer with mechanical agitation. Treatments were assigned In Sep, all treatments had significantly reduced the number of to trees on 22 Apr 2014 in a RCB design based on pretreatment nymphs per leaf, except for Movento, TriTek, Ecotec, and counts of mature female citricola found on five twigs (16 inch in TriTekþ Ecotec (Table 1). All rates of Sequoia, Sivanto, Bexar, Agri- length) randomly selected from around each sample tree. All treat- Flex, Assail, Sevin, and Belay reduced the nymphs below the economic ments were applied with 0.5% Omni 6E oil, except for Movento threshold of 0.50 nymphs per leaf in Oct. All treatments except that was applied at 1.0% and the TriTek and Ecotec treatments Movento, Ecotec, and TriTekþ Ecotek significantly reduced the num- were applied without oil. Treatments were applied on 13, 14, or 15 ber of females below the treatment threshold of 1 scale per branch in Aug when the population consisted of first-instar nymphs infesting the spring 2015 sample. This research was supported by the California leaves. The TriTek and Ecotec treatments were applied again 2 wk Citrus Research Board and industry gifts of funding and pesticides. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 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 journals.permissions@oup.com 2 Arthropod Management Tests, 2016, Vol. 41, No. 1 Table 1 Treatment/formulation Rate-amt form/acre Dilution (gal/acre) Treatment date Mean no. of citricola scale per leaf or twig a b b a 22 Apr 2014 18 Sept 17 Oct 21 Apr 2015 Untreated 1.28a 0.65a 1.25a 3.30a Sequoia 2 SCþ Omni 6E oil 5.75 fl ozþ 0.50% 100 13 Aug 1.25a 0.08bc 0.00d 0.08d Sequoia 2 SCþ Omni 6E oil 5.75 fl ozþ 0.50% 300 13 Aug 1.23a 0.03c 0.05d 0.03d Sequoia 2 SCþ Omni 6E oil 7.0 fl ozþ 0.50% 100 13 Aug 1.20a 0.05bc 0.03d 0.00d Sequoia 2 SCþ Omni 6E oil 7.0 fl ozþ 0.50% 300 13 Aug 1.23a 0.15bc 0.13d 0.03d Sivanto 200 SLþ Omni 6E oil 10.5 fl ozþ 0.50% 300 13 Aug 1.23a 0.08bc 0.15d 0.12d Movento 240 SCþ Omni 6E oil 8.0 fl ozþ 1.00% 300 13 Aug 1.20a 0.40ab 0.98abc 2.13ab Bexar 15 SCþ Omni 6E oil 27 fl ozþ 0.50% 300 14 Aug 1.20a 0.03c 0.00d 0.10d Agri-Flex SCþ Omni 6E oil 8.5 fl ozþ 0.50% 300 14 Aug 1.25a 0.10bc 0.05d 0.03d Assail 30 SGþ Omni 6E oil 13 ozþ 0.50% 300 15 Aug 1.25a 0.00c 0.05d 0.00d Sevin XLR Plusþ Omni 6E oil 5 qtþ 0.50% 300 15 Aug 1.28a 0.03c 0.10d 0.03d Belay 2.13 SCþ Omni 6E oil 6 fl ozþ 0.50% 300 15 Aug 1.28a 0.00c 0.03d 0.00d TriTek 1.5 gal 300 15 Augþ 29 Aug 1.23a 0.53a 0.58c 0.90c Ecotec 64.0 fl oz 300 15 Augþ 29 Aug 1.28a 0.78a 1.13ab 2.28b TriTekþ Ecotec 1.0 galþ 32 oz 300 15 Augþ 29 Aug 1.30a 0.63a 0.73bc 1.25bc Means within a column followed by the same letter are not significantly different (LSD, P¼ 0.05) after log10 (xþ 1) transformation; non-transformed means are listed. Citricola adult females sampled on twigs. Citricola nymphs sampled on leaves. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Citricola Scale Insecticide Trial, 2014

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Oxford University Press
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© The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America.
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2155-9856
DOI
10.1093/amt/tsw005
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Abstract

Arthropod Management Tests, 2016, 1–2 doi: 10.1093/amt/tsw005 Section D: Citrus, Nuts, and Other Tree Fruits ORANGE: Citrus sinensis (L.) Osbeck, ‘Parent’ Navel Elizabeth E. Grafton-Cardwell, Sara J. Scott, and Jamie N. Nemecek Department of Entomology, University of California, Riverside, CA 92521, Phone: (559) 592-2408, Fax: (559) 592-5947 (eegraftoncardwell@ucanr.edu; sascott@ucanr.edu; jnnemecek@ucanr.edu) and Corresponding author, e-mail: eegraftoncardwell@ucanr.edu Subject Editor: David Haviland Orange | Citrus sinensis citricola scale | Coccus pseudomagnoliarum Citricola scale causes loss of tree vigor, yield reduction and down- after the 15 Aug treatment. Post-treatment sampling consisted of grading of fruit in the packing house due to sooty mold growth on counts of first-instar citricola nymphs infesting five leaves collected honeydew deposited by the insect. A field trial was conducted in a from the NE corner of each sample tree during Aug through Oct 22-yr-old ‘Parent’ navel orange orchard at the Lindcove Research 2014. An additional sample of mature female citricola on five twigs and Extension Center, Exeter, California to compare various tim- per tree was collected on 21 Apr 2015. Mean numbers of scales per ings and rates of insecticides for efficacy against citricola scale. twig or leaf were compared between treatments using ANOVA after Insecticides were applied diluted in 100 or 300 gpa of water to 8 log (xþ 1) transformation of numbers and the means were sepa- trees per treatment using a 100 gal high pressure D30 diaphragm rated according to the Fisher’s LSD test (P¼ 0.05). pump sprayer with mechanical agitation. Treatments were assigned In Sep, all treatments had significantly reduced the number of to trees on 22 Apr 2014 in a RCB design based on pretreatment nymphs per leaf, except for Movento, TriTek, Ecotec, and counts of mature female citricola found on five twigs (16 inch in TriTekþ Ecotec (Table 1). All rates of Sequoia, Sivanto, Bexar, Agri- length) randomly selected from around each sample tree. All treat- Flex, Assail, Sevin, and Belay reduced the nymphs below the economic ments were applied with 0.5% Omni 6E oil, except for Movento threshold of 0.50 nymphs per leaf in Oct. All treatments except that was applied at 1.0% and the TriTek and Ecotec treatments Movento, Ecotec, and TriTekþ Ecotek significantly reduced the num- were applied without oil. Treatments were applied on 13, 14, or 15 ber of females below the treatment threshold of 1 scale per branch in Aug when the population consisted of first-instar nymphs infesting the spring 2015 sample. This research was supported by the California leaves. The TriTek and Ecotec treatments were applied again 2 wk Citrus Research Board and industry gifts of funding and pesticides. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 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 journals.permissions@oup.com 2 Arthropod Management Tests, 2016, Vol. 41, No. 1 Table 1 Treatment/formulation Rate-amt form/acre Dilution (gal/acre) Treatment date Mean no. of citricola scale per leaf or twig a b b a 22 Apr 2014 18 Sept 17 Oct 21 Apr 2015 Untreated 1.28a 0.65a 1.25a 3.30a Sequoia 2 SCþ Omni 6E oil 5.75 fl ozþ 0.50% 100 13 Aug 1.25a 0.08bc 0.00d 0.08d Sequoia 2 SCþ Omni 6E oil 5.75 fl ozþ 0.50% 300 13 Aug 1.23a 0.03c 0.05d 0.03d Sequoia 2 SCþ Omni 6E oil 7.0 fl ozþ 0.50% 100 13 Aug 1.20a 0.05bc 0.03d 0.00d Sequoia 2 SCþ Omni 6E oil 7.0 fl ozþ 0.50% 300 13 Aug 1.23a 0.15bc 0.13d 0.03d Sivanto 200 SLþ Omni 6E oil 10.5 fl ozþ 0.50% 300 13 Aug 1.23a 0.08bc 0.15d 0.12d Movento 240 SCþ Omni 6E oil 8.0 fl ozþ 1.00% 300 13 Aug 1.20a 0.40ab 0.98abc 2.13ab Bexar 15 SCþ Omni 6E oil 27 fl ozþ 0.50% 300 14 Aug 1.20a 0.03c 0.00d 0.10d Agri-Flex SCþ Omni 6E oil 8.5 fl ozþ 0.50% 300 14 Aug 1.25a 0.10bc 0.05d 0.03d Assail 30 SGþ Omni 6E oil 13 ozþ 0.50% 300 15 Aug 1.25a 0.00c 0.05d 0.00d Sevin XLR Plusþ Omni 6E oil 5 qtþ 0.50% 300 15 Aug 1.28a 0.03c 0.10d 0.03d Belay 2.13 SCþ Omni 6E oil 6 fl ozþ 0.50% 300 15 Aug 1.28a 0.00c 0.03d 0.00d TriTek 1.5 gal 300 15 Augþ 29 Aug 1.23a 0.53a 0.58c 0.90c Ecotec 64.0 fl oz 300 15 Augþ 29 Aug 1.28a 0.78a 1.13ab 2.28b TriTekþ Ecotec 1.0 galþ 32 oz 300 15 Augþ 29 Aug 1.30a 0.63a 0.73bc 1.25bc Means within a column followed by the same letter are not significantly different (LSD, P¼ 0.05) after log10 (xþ 1) transformation; non-transformed means are listed. Citricola adult females sampled on twigs. Citricola nymphs sampled on leaves.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2016

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