Acacia confusa (tree, shrub)

Ecology Distribution Management Info Impact Info References and Links Contacts

Management Information Preventative measures: A Risk Assessment of Acacia confusa for Hawai‘i and other Pacific islands was prepared by Dr. Curtis Daehler (UH Botany) with funding from the Kaulunani Urban Forestry Program and US Forest Service. The alien plant screening system is derived from Pheloung et al. (1999) with minor modifications for use in Pacific islands (Daehler et al. 2004). The result is a score of 10 and a recommendation of: "Likely to cause significant ecological or economic harm in Hawai‘i and on other Pacific Islands as determined by a high WRA score, which is based on published sources describing species biology and behaviour in Hawai‘i and/or other parts of the world." Chemical: Saplings sensitive to foliar application of 2,4-D at 1 lb/acre and of triclopyr at 1 lb/acre in a trial at Wailua, Kauai. Triclopyr at 2 lb/acre provided 80% control but 2,4-D at 2 lb/acre caused moderate injury and metsulfuron at 0.4 oz active/acre was ineffective at Kala’e, Molokai. Somewhat tolerant of dicamba. Sensitive to cut-surface applications of 2,4-D, dicamba, glyphosate, picloram (45) and triclopyr in trials at Wailua, Kauai. However, in trials at Kala’e, Molokai, results were less impressive with picloram and dicamba providing serious but not lethal injury and glyphosate and 2,4-D providing moderate injury to Formosan koa. Sensitive to very-low volume basal bark application of 20% triclopyr in oil. Staff at the Hawai‘i Volcanoes National Park (HAVO) used triclopyr ester at 5% of product in diesel oil applied to the basal bark (Chris Zimmer, HAVO). Tolerant of tebuthiuron pellets (Motooka et al., 2002 in PIER, 2003). The weed control appendix provides information on chemical, mechanical, physical, biological management options for this species. Information on species description and environmental impacts is also available.              Management Resources/Links 1. Daehler, C.C; Denslow, J.S; Ansari, S and Huang-Chi, K., 2004. A Risk-Assessment System for Screening Out Invasive Pest Plants from Hawaii and Other Pacific Islands. Conservation Biology Volume 18 Issue 2 Page 360.         Summary: A study on the use of a screening system to assess proposed plant introductions to Hawaii or other Pacific Islands and to identify high-risk species used in horticulture and forestry which would greatly reduce future pest-plant problems and allow entry of most nonpests. 2. European and Mediterranean Plant Protection Organization (EPPO), 2006. Guidelines for the management of invasive alien plants or potentially invasive alien plants which are intended for import or have been intentionally imported. EPPO Bulletin 36 (3), 417-418. 3. PIER (Pacific Island Ecosystems at Risk), 2002. Acacia confusa         Summary: Ecology, synonyms, common names, distributions (Pacific as well as global), management and impact information. Available from: http://www.hear.org/pier/species/acacia_confusa.htm [Accessed 3 June 2003]. 4. Sailer, Dan., 2006. Weed control appendix. I Ho ola I Ka Nahele: To Heal A Forest A Mesic Forest Restoration Guide for Hawaii         Summary: The weed control table is an appendix of I Ho ola I Ka Nahele: To Heal A Forest A Mesic Forest Restoration Guide for Hawaii. The manual provides information on the basic principles, methods, and techniques of managing mesic forests in particular and terrestrial native Hawaiian ecosystems in general. Many of the technical recommendations in this manual stem from five years of mesic forest restoration work at The Nature Conservancy’s Honouliuli Preserve on Oahu. Most of the resource management recommendations are gleaned from the published works and personal communications of those who have worked for over twenty years in the field of conservation biology. The contents of the manual can be viewed at Source information          Results Page: 1