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EFFICACY OF SOIL-APPLIED NEONICOTINOID INSECTICIDES FOR CONTROL OF CALIFORNIA RED SCALE, 2001

EFFICACY OF SOIL-APPLIED NEONICOTINOID INSECTICIDES FOR CONTROL OF CALIFORNIA RED SCALE, 2001 (D5) ORANGE: Citrus sinensis L., Osbeck, 'Washington navel' EFFICACY OF SOIL-APPLIED NEONICOTINOID INSECTICIDES FOR CONTROL OF CALIFORNIA RED SCALE, 2001 Elizabeth E. Grafton-Cardwell Department of Entomology University of California Riverside, CA 92521 Tel: (559) 646-6591 Fax: (559) 646-6593 bethgc@uckac.edu Chris A. Reagan California red scale (CRS): Aonidiella aurantii (Maskell) A field trial was conducted at the Lindcove Research and Extension Center, Exeter, California, to compare the efficacy of single applications of 16 and 32 oz of imidacloprid (Admire 2F) with two applications of 16 oz applied approximately 2 months apart against California red scale (CRS). Scale on five randomly collected 23 cm, 2-yr-old twigs, from each of five trees per row were evaluated 23 Apr 2001 to assign three rows to each treatment. Soil was irrigated in treated and check plots for approximately 1 h through the micro irrigation system (Fan-Jet wrap-around trajectory heads, 30 psi) prior to applying Admire 2F to the soil beneath 9-yr-old 'Washington' navel orange trees. Admire was injected into the irrigation system over a 2-h period and all treatments were followed by an additional 2 h of irrigation. First treatments were applied on 10 and 15 May 2001 and the additional 16 oz Admire treatment was applied on 25 Jul 2001. CRS densities were evaluated at monthly intervals on five randomly selected 2-yr-old, 23-cm-long twigs per tree and five fruit per tree (when available). All live 1st and 2nd instar scale and 3rd instar and mature female scale were counted. Fruit was harvested on 20 Feb 2002 and the crop was evaluated for the percentage of fruit that had >10 CRS per fruit. Imidacloprid applied at 32 oz/acre in May and at 16 oz/acre in both May and Jul, significantly reduced the number of live CRS found on leaves and fruit of navel oranges from Jul through Oct (Table 1.). Significant reduction of the percentage of the crop with >10 CRS per fruit at harvest also resulted from these treatments. A single application of imidacloprid at 16 oz in May was significantly less effective in reducing CRS compared to the single application of 32 oz or the double application of 16 oz. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF SOIL-APPLIED NEONICOTINOID INSECTICIDES FOR CONTROL OF CALIFORNIA RED SCALE, 2001

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
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10.1093/amt/28.1.D5
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Abstract

(D5) ORANGE: Citrus sinensis L., Osbeck, 'Washington navel' EFFICACY OF SOIL-APPLIED NEONICOTINOID INSECTICIDES FOR CONTROL OF CALIFORNIA RED SCALE, 2001 Elizabeth E. Grafton-Cardwell Department of Entomology University of California Riverside, CA 92521 Tel: (559) 646-6591 Fax: (559) 646-6593 bethgc@uckac.edu Chris A. Reagan California red scale (CRS): Aonidiella aurantii (Maskell) A field trial was conducted at the Lindcove Research and Extension Center, Exeter, California, to compare the efficacy of single applications of 16 and 32 oz of imidacloprid (Admire 2F) with two applications of 16 oz applied approximately 2 months apart against California red scale (CRS). Scale on five randomly collected 23 cm, 2-yr-old twigs, from each of five trees per row were evaluated 23 Apr 2001 to assign three rows to each treatment. Soil was irrigated in treated and check plots for approximately 1 h through the micro irrigation system (Fan-Jet wrap-around trajectory heads, 30 psi) prior to applying Admire 2F to the soil beneath 9-yr-old 'Washington' navel orange trees. Admire was injected into the irrigation system over a 2-h period and all treatments were followed by an additional 2 h of irrigation. First treatments were applied on 10 and 15 May 2001 and the additional 16 oz Admire treatment was applied on 25 Jul 2001. CRS densities were evaluated at monthly intervals on five randomly selected 2-yr-old, 23-cm-long twigs per tree and five fruit per tree (when available). All live 1st and 2nd instar scale and 3rd instar and mature female scale were counted. Fruit was harvested on 20 Feb 2002 and the crop was evaluated for the percentage of fruit that had >10 CRS per fruit. Imidacloprid applied at 32 oz/acre in May and at 16 oz/acre in both May and Jul, significantly reduced the number of live CRS found on leaves and fruit of navel oranges from Jul through Oct (Table 1.). Significant reduction of the percentage of the crop with >10 CRS per fruit at harvest also resulted from these treatments. A single application of imidacloprid at 16 oz in May was significantly less effective in reducing CRS compared to the single application of 32 oz or the double application of 16 oz.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2003

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