Relative suitability of 23 cultivars of juniper (Juniperus spp.) for growth and survival of the bagworm, Thyridopteryx ephemeraeformis (Haworth) was evaluated in laboratory and field experiments. Weight gain, developmental rate, and survival of bagworms differed significantly among groups of larvae fed foliage from different cultivars. By these criteria, cultivars ‘Expansa’ and ‘Hibemica’ were most unsuitable for survival and development of bagworms, whereas ‘Broadmoor’ and ‘Emerald Isle’ were consistently among the most suitable cultivars. This study suggests that use of certain juniper cultivars may be useful in managing this perennial insect pest in urban landscapes.

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Author notes

2Extension Specialist, Professor, and former graduate student, respectively. This research was supported in part by the nursery industry through contributions to the Horticultural Research Institute, a non-profit organization devoted to nursery industry progress through research. J.R. Hartman, Dept. of Plant Pathology, R.E. McNiel and W.M. Fountain, Dept. of Horticulture (University of Kentucky), provided valuable help with this project. We thank Greenleaf Nursery, Park Hill, OK; Hillenmeyer Nurseries, Lexington, KY; Frank Otte Nursery, Anchorage, KY; and Wight Nurseries, Cairo, GA for donating plants. ICI Americas, Rohm and Haas Co., and DowElanco donated herbicides for maintenance of field plots. We extend special thanks to R.T. Bessin, Dept, of Entomology, University of KY, for statistical advice, and P.G. Spicer, J. Doney, D. Slone and L. Terry for technical help. This is paper no. 93-7-72 of the Kentucky Agricultural Experiment Station.