Distribution of Trunk-injected Carbon-14 Imidacloprid in Fraxinus and Acer Trees: A Test of the Sectored Flow Hypothesis

Distribution of Trunk-injected Carbon-14 Imidacloprid in Fraxinus and Acer Trees: A Test of the Sectored Flow Hypothesis

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Emerald ash borer (Agrilus planipennis Fairmore, Coleoptera: Buprestidae) and Asian longhorned beetle (Anoplophora glabripennis, Motschulsky, Coleoptera, Cerambycidae) are invasive exotic insect pests that have destroyed millions of trees in the United States and Canada. Imidacloprid applied as a trunk injection is often used as a means of control, but efficacy is variable. The objectives of this study were to determine the (1) spatial movement of imidacloprid in ash (Fraxinus spp.) and maple (Acer spp.) trees (2) concentration of imidacloprid in tree tissues over two growing seasons and (3) variability of imidacloprid concentration in trees trunk-injected in either spring or fall. Thirty-two ash trees were trunk-injected with 14C imidacloprid in June 2006, eight additional ash and eight maple trees were trunk-injected in September 2006. Leaves, trunk cores, fine roots, and stems were sampled over two growing seasons. Imidacloprid equivalent concentration (IEC) in ash leaves varied with time, and orientation to the injection point. Leaves from trees injected in the June had higher IEC than leaves from trees injected in September 21 DAT. During the year after injection, IEC in leaves from both sets of trees were similar, though some patterns of sectoriality were still present. Imidacloprid equivalent concentration in maple leaves was relatively constant and did not vary between opposite branches or over time. We conclude that ash trees have zigzag xylem architecture patterns and maple trees have integrated xylem architecture patterns.National Plant Data Center, Baton Rouge, LA 70874-4490 USA. van Gelderen, D.M., P.C. de Jong, H.J. Oterdoom, and T.R. Dudley. 1994. Maples of the World. Timber Press, Portland, OR, USA. 478 pp. Vuorisalo, T. and M.J. Hutchings. 1996 .


Title:Distribution of Trunk-injected Carbon-14 Imidacloprid in Fraxinus and Acer Trees: A Test of the Sectored Flow Hypothesis
Author: Sara Rose Tanis
Publisher:ProQuest - 2008
ISBN-13:

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