Alva, FL, United States
Alva, FL, United States

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Ali A.D.,Davey Tree Expert Company | Caldwell D.,University of Florida
Florida Entomologist | Year: 2010

The Royal Palm, Roystonia regia (Kunth) O. F. Cook, is a quintessential tree in South Florida landscapes and has relatively few pests. However, it can be severely damaged by non-predictable population flare-ups of the Royal Palm Bug (RPB), Xylastodoris luteolus Barber. Damage appears as frizzled new growth that reduces aesthetics and may affect photosynthetic ability. This study was conducted to evaluate the efficacy of soil-applied neonicotinoid systemic insecticides. All 3 active ingredients tested, Merit 2F (imidacloprid), Safari 2 G and Safari 20 SG (dinotefuran) and Arena 50 WDG (clothianidin) provided excellent RPB control 30 and 75 d after treatment. ELISA analysis of palm foliage showed dinotefuran translocated fastest, followed by imidacloprid and then clothianidin. Soil application of insecticides is preferred in urban landscapes over foliar treatments due to elimination of drift and reduction in environmental concerns. To protect the appearance of the popular Royal Palm, it is advantageous to apply a systemic neonicotinoid at the first symptom of an infestation.

Hirabayashi S.,Davey Tree Expert Company | Kroll C.N.,New York University | Nowak D.J.,U.S. Department of Agriculture
Environmental Pollution | Year: 2012

A distributed air pollutant dry deposition modeling system was developed with a geographic information system (GIS) to enhance the functionality of i-Tree Eco (i-Tree, 2011). With the developed system, temperature, leaf area index (LAI) and air pollutant concentration in a spatially distributed form can be estimated, and based on these and other input variables, dry deposition of carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO 2), and particulate matter less than 10 microns (PM10) to trees can be spatially quantified. Employing nationally available road network, traffic volume, air pollutant emission/measurement and meteorological data, the developed system provides a framework for the U.S. city managers to identify spatial patterns of urban forest and locate potential areas for future urban forest planting and protection to improve air quality. To exhibit the usability of the framework, a case study was performed for July and August of 2005 in Baltimore, MD. © 2012 Elsevier Ltd. All rights reserved.

Ali A.D.,Davey Tree Expert Company | Bernick S.C.,Rainbow Treecare Scientific Advancements
Arboriculture and Urban Forestry | Year: 2010

Paclobturazol is a plant growth regulator which reduces cell elongation and growth. It is commonly used in reducing the growth of herbaceous plants and woody dicots. It has also shown activity against young palms, such as oil and date palms. The effects of basal drench treatments applied annually or as a single application on mature Royal palms {Roystonea regia) were studied over a three-year period. No significant effects were noted on lateral trunk growth. Paclobutrazol treatments resulted in slower vertical growth than in palms not receiving a treatment. However, even at 36 MAT, the average reduction in vertical growth (approx. 50 cm) was still not horticulturally significant relative to the overall palm height of approximately 7 m. Royal palms may attain heights up to 24 m when mature. It is recommended that they not be planted within 7 m of utility lines especially considering regulating their vertical growth is not a practical option. © 2010 International Society of Arboriculture.

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