Table of Contents F. Ferrini , A. Giuntoli, F.P. Nicese, S. Pellegrini, and N. Vignozzi EFFECT OF FERTILIZATION AND BACKFILL AMENDMENTS ON SOIL CHARACTERISTICS, GROWTH, AND LEAF GAS EXCHANGE OF ENGLISH OAK (QUERCUS ROBUR L.) ............................................. 182 Abstract. The influence of fertilization and soil amendments on plant growth and leaf gas exchange was monitored on Eng- lish oak trees (Quercus robur L.) over a 3-year period aſter planting. The results indicate that shoot growth, leaf area, chloro- phyll content, and leaf gas exchange were higher in fertilized plants, especially during the second and third years aſter plant- ing. However, compost and leonardite were rarely better than the control. Soil physical characteristics were positively influenced by soil amendments, which promoted a better structure and lowered penetration resistance compared to control and fertilization. Key Words.Chlorophyll; Compost; Humate; Photosynthesis; Soil Characteristics. Sarah B. Celestian and Chris A. Martin EFFECTS OF PARKING LOT LOCATION ON SIZE AND PHYSIOLOGY OF FOUR SOUTHWESTERN U.S. LANDSCAPE TREES ................................................................... 191 Abstract. This study evaluated effects of two parking lot landscapelocations on size and physiology of four regionally common landscape tree species. Tree size measurements were made during August 2001 and 2002 and tree gas exchange and leaf chlorophyll concentrations were me sured during April and August 2002. Trees were mostly smaller and leaf gas exchange fluxes were lower for Australian bottle tree (Brachychiton populenus Schott & Endl.), Arizona ash (Fraxinus velutina Torr.), and Chinese elm (Ulmus parvifolia Jacq.) located within narrow landscaped medians surrounded by asphalt compared with similarly aged trees in large landscaped areas along the parking lot perimeters. In contrast, par ing lot location had no statistical effect on size of Argentine mesquite (Prosopis alba Griebach) except for diameter at breast height, which was signif cantly less for trees in the landscaped medians in 2002. Leaf chlorophyll concentrations of all trees located in landscaped medians were lower than those of trees within surrounding landscaped perimeter areas except for Australian bottle tree, which had higher significantly leaf chlor phyll concentration during April when located in landscaped medians. Based on these results, Argentine mesquite appears to be the best of these four tree species for use in commercial parking lot landscapes because its growth and physiological function were least affected by parking lot location. Key Words. Asphalt; Chlorophyll; Commercial Land Use; Photosynthesis; Stomatal Conductance; Urban Trees. Jay Cee L. Turner and Eileen A. Buss BIOLOGY AND MANAGEMENT OF ALLOKERMES KINGII (HEMIPTERA: KERMESIDAE) ON OAK TREES (QUERCUS SPP.) ............................................................................ 198 1 2 Abstract. The northern red-oak kermes scale, Allokermes kingii (Cockerell), is a native, gall-like scale insect found on oak trees (Quer- cus spp.) in the United States. Its feeding causes branch dieback, flagging, reduced growth rates, and occasionally tree death. Alloker- mes kingii has one generation a year throughout most of the United States, but we found two generations a year in Florida. It also infests Q. geminata Small and Q. virginiana Miller, which represent new host records. The insecticides tested (acephate, bifenthrin, imidaclo- prid, horticultural oil, and combined acephate and oil) appeared to suppress the nymphal population, but none caused >42% mortal- ity. Very few natural enemies occurred on the study trees, and were thus considered ineffective at reducing the scale population at this site. Key Words. Allokermes kingii; Insecticide Trial; Kermesidae; Northern Red-Oak Kermes; Quercus geminata; Quercus virginiana. Joseph J. Doccola, Ilangovan Ramasamy, Paulina Castillo, Christine Taylor, and Samantha Sifleet ERRATUM: EFFICACY OF ARBORJET VIPER MICROINJECTIONS IN THE MANAGEMENT OF HEMLOCK WOOLLY ADELGID (ADELGES TSUGAE) ................................................. 203 Editor’s note: The authors have submitted this correction to their earlier paper, which was originally published in the November 2003 issue of the Journal of Arboriculture (29(6):327–330). This article clarifies the presentation of their statistical analyses. Abstract. Hemlock woolly adelgid (Adelges tsugae Annand) is an introduced homopteran that infests native eastern hemlock (Tsuga canadensis Carriere). It results in reduced tree vitality and, when untreated, death. A state-of-the-art microinjection device employing an air-over-hydraulic system was used to deliver a therapeutic dosage of imidacloprid into the active xylem tissues of affected hemlocks. Bioa says were conducted microscopically to determine HWA mortality post-treatment. Injected trees had significantly (P < 0.05) lower HWA populations compared to untreated controls; mean mortality for injected trees was over twice that of noninjected trees. The Arborjet VIPER system shows promise as a management tool in the treatment of HWA. Key Words. Adelges tsugae; Arborjet VIPER; Homoptera; Imidacloprid; Tsuga spp. ©2005 | International Society of Arboriculture | ISSN:1935-5297
July 2005
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