The 2005 ESA Annual Meeting and Exhibition
December 15-18, 2005
Ft. Lauderdale, FL

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Friday, December 16, 2005
D0132

Predators of Fiorinia externa (Hemiptera: Diaspididae) on eastern hemlock in urban and forest sites

Christine Lynch, clynch3@utk.edu1, Paris L. Lambdin, plambdin@utk.edu1, Jerome F. Grant, jgrant@utk.edu1, Richard C. Reardon, rreardon@fs.fed.us2, and James R. "Rusty" Rhea, rrhea@fs.fed.us3. (1) University of Tennessee, Department of Entomology and Plant Pathology, Knoxville, TN, (2) USDA Forest Service, Forest Health Technology Enterprise Team, 180 Canfield Street, Morgantown, WV, (3) USDA Forest Service, Forest Health Protection, 200 WT Weaver Blvd, Asheville, NC

A project was initiated in September 2004 to determine the indigenous predators of Fiorinia externa Ferris, elongate hemlock scale, and their impact on the pest populations. Predators of elongate hemlock scale were collected in eastern Tennessee and western North Carolina at three sites from beat sheet samples and branch cuttings. Laboratory tests were conducted on the field collected predators to assess food consumption, development, survivability and feeding behavior, and to assess intraguild competition among predators of elongate hemlock scale. Eight coleopteran species were documented to feed on elongate hemlock scale. Scymnillus horni, Rhyzobius lophanthae and Chilocorus stigma were the most abundant and frequently found predators in urban and forest sites. Larvae of C. stigma consumed the highest number of prey daily. A species of Coniopterix was also found to occasionally feed on this exotic pest. Percent beetle damage in elongate hemlock scale populations in the forest and urban locations was similar, 9.0 % and 9.4 %, respectively.


Species 1: Coleoptera Coccinellidae Scymnillus horni
Species 2: Coleoptera Coccinellidae Rhyzobius lophanthae
Species 3: Coleoptera Coccinellidae Chilocorus stigma
Keywords: Predators, Hemlock