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Lobate lac scale, Paratachardina pseudolobata (Hemiptera: Keriidae), in Hawaii's urban landscape: Hosts and management

  • Bishnu Prasad Bhandari (a1) and Zhiqiang Cheng

The lobate lac scale, Paratachardina pseudolobata Kondo & Gullan, is a recent insect invader to Hawaii that was first found in October 2012 on Oahu, Hawaii. It infests young branches of woody plants (usually less than 2 cm in diameter), forming a mass that appears as a dark crust, resulting in an unhealthy appearance, defoliation of leaves, and death of some plant species. This insect has infested many native and non-native plant species on Oahu, and the number of infested plant species is increasing. Our recent survey results, reported in this article, revealed 28 new host plant species in addition to 83 host species that we had reported previously, making 111 host plant species in Oahu's urban landscape. Efficacy and longevity of preventive treatment using the systemic insecticides imidacloprid and emamectin benzoate, delivered through trunk injection, against lobate lac scale on Chinese banyan, Ficus microcarpa, and curative treatment using imidacloprid on weeping banyan, Ficus benjamina, were evaluated. Forty-five Chinese banyans and 10 weeping banyans were included in this study. Our findings suggest that imidacloprid delivered via trunk injection is effective in preventing lobate lac scale infestation for at least 22 months post-treatment, and also in reducing lobate lac scale infestation curatively for at least 20 months post-treatment. This study provides an update on lobate lac scale's host species in Hawaii's urban landscape, and an effective preventive and curative management strategy against this pest.

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Zhiqiang Cheng is co-first author.

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Bhandari, B. P. and Cheng, Z. (2016) Trunk injection of systemic insecticides to control stem and leaf gall wasps, Josephiella species (Hymenoptera: Agaonidae), on Chinese banyan (Rosales: Moraceae) in Hawaii. Florida Entomologist 99, 172177.
Cheng, Z. and Bhandari, B. P. (2015) Biology, management, and updated host range of the lobate lac scale (Paratachardina pseudolobata) in Hawai‘i's urban landscapes. College of Tropical Agriculture and Human Resources (CTAHR), University of Hawaii at Manoa. Available from: (last accessed June 13, 2017).
Chong, J. H., Roda, A. L. and Mannion, C. M. (2008) Mortality of the lobate lac scale, Paratachardina pseudolobata (Hemiptera: Kerriidae), at near or below freezing temperatures. Florida Entomologist 91, 674678.
Doccola, J. J., Smith, S. L., Strom, B. L., Medeiros, A. C. and von Allmen, E. (2009) Systemically applied insecticides for treatment of Erythrina gall wasp, Quadrastichus erythrinae Kim (Hymenoptera: Eulophidae). Arboriculture & Urban Forestry 35, 173181.
Eisenback, B. M., Salom, S. M., Kok, L. T. and Lagalante, A. F. (2014) Impacts of trunk and soil injections of low rates of imidacloprid on hemlock woolly adelgid (Hemiptera: Adelgidae) and eastern hemlock (Pinales: Pinaceae) health. Journal of Economic Entomology 107, 250258.
Hamon, A. B. and Hodges, G. (2001) Pest alert: Lobate lac scale, Paratachardina pseudolobata (Chamberlin) (Hemiptera: Kerriidae). Florida Department of Agriculture and Consumer Services, Division of Plant Industry.,_Lobate_lac_scale.pdf (Last accessed June 13, 2017).
Howard, F. W. and Steinberg, B. (2005) Root drenches and topical insecticide treatments for control of the lobate lac scale, Paratachardina lobata (Chamberlin). Proceedings of Florida State Horticultural Society 118, 314318.
Howard, F. W., Pemberton, R. W., Hodges, G. S., Steinberg, B., McLean, D. and Liu, H. (2006) Host plant range of lobate lac scale, Paratachardina lobata, in Florida. Proceedings of Florida State Horticultural Society 119, 398408. Available from:
Howard, F. W., Pemberton, R. W., Shroer, S. and Hodges, G. (2010) Paratachardina pseudolobata (Coccoidea: Kerriidae): Bionomics in Florida. Florida Entomologist 93, 17.
Kondo, T. and Gullan, P. J. (2007) Taxonomic review of the lac insect genus Paratachardina Balachowsky (Hemiptera: Coccoidea: Kerriidae), with a revised key to genera of Kerriidae and description of two new species. Zootaxa 1617, 141.
McCullough, D. G., Poland, T. M., Anulewicz, A.C., Lewis, P. and Cappaert, D. (2011) Evaluation of Agrilus planipennis (Coleoptera: Buprestidae) control provided by emamectin benzoate and two neonicotinoid insecticides, one and two seasons after treatment. Journal of Economic Entomology 104, 15991612.
Norris, D. M. (1965) Systemic pesticides in woody plants and uptake. Bulletin of the Entomological Society of America 11, 187190.
Smitley, D. R., Doccola, J. J. and Cox, D. L. (2010) Multiple-year protection of ash trees from emerald ash borer with a single trunk injection of emamectin benzoate, and single-year protection with an imidacloprid basal drench. Arboriculture & Urban Forestry 36, 206211.
State of Hawaii, Department of Agriculture (2013) Lobate lac scale: Paratachardina pseudolobata Kondo and Gullan (Hemiptera: Kerriidae). New Pest Advisory No. 12-03, January 2013. Available from: (last accessed June 13, 2017).
Young, L. C. (2002) The efficacy of micro-injected imidacloprid and oxydemeton-methyl on red gum eucalyptus trees (Eucalyptus camaldulensis) infested with red gum lerp psyllid (Glycaspis brimblecombei). Journal of Arboriculture 28, 144147.
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International Journal of Tropical Insect Science
  • ISSN: 1742-7584
  • EISSN: 1742-7592
  • URL: /core/journals/international-journal-of-tropical-insect-science
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