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The Global Invasive Species Team | |
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Global Invasive Species Team listserve digest #044 Sun, 3 Oct 1999 16:48:19 -0700 (PDT) --CONTENTS-- 1. Weed-eating goats on Smilax and other woodies 2. Goats vs. knapweed, goats with herbicide 3. Succulent control 4. November 6 weed conference in Massachusetts 5. Two items on working with nurseries to prevent weed problems --------------------------------------- 1. Weed-eating goats on Smilax and other woodies From: Karen Budd (kbudd3030(at)aol.com) We have used goats on the serpentine barrens in southern Chester County, Pennsylvania, to eat Smilax rotundifolia (catbrier), which is choking out the native vegetation. They also happily eat Rosa multiflora, Lonicera sp., and grape vines. Unfortunately, however, they will also eat desirable woodies. So don't put them anywhere where you have trees and/or shrubs that you value. --------------------------------------- 2. Goats vs. knapweed, goats with herbicide From: David Hodge (dhodge(at)tnc.org) A question arose in an earlier posting about using goats to control spotted knapweed. I have never tried this, but have heard that goats only prevent the further spread of knapweed. Since the root systems are very hardy, killing the tops (either with goats or herbicide) will not kill the plant. Therefore this should only be used if you only want to control further spreading. Has anyone used goats in conjunction with herbicides? It may be that after the resprouts come up, they are more vulnerable to herbicides. --------------------------------------- 3. Succulent control From: Pat Bily (pbily(at)tnc.org) Does anyone have experience successfully controlling succulent plants with herbicide? Certain species of Kalanchoe have naturalized in Hawaii, as well as Agave and Furcraea, and there is the potential of more garden escapes in the future. We have had luck on individual plants using low volume treatments of triclopyr in oil, but want to explore foliar applications that will also continue to kill pieces (propagules) that later fall off the target plants. This could involve a systemic combined with a good penetrating surfactant. Who has got the magic bullet for lasting control of Carpobrotus? --------------------------------------- 4. November 6 weed conference in Massachusetts From: Kay Sadighi (KayTrees(at)aol.com) Invasive Plants: Challenges, Options, and Methods of Control, a conference sponsored by the New England Wildflower Society, will be held November 6, 1999 at the Sheraton Terra, Framingham, MA 9 a.m.-4:30 p.m. Keynote speakers will be Dr. John Randall, The Nature Conservancy, and Dr. Randy Westbrooks, Invasive Plant Liaison, U.S. Dept. of Interior-U.S. Dept. of Agriculture National Invasive Species Council. Four panels will address upland invasives, wetland invasives, aquatic invasives and species of concern. Please contact Greg Lowenberg, NEWFS Education Director (lowenberg(at)newfs.org) or call 508-877-7630, ext. 3303 for information. --------------------------------------- 5. Two items on working with nurseries to prevent weed problems From: John Randall (jarandall(at)ucdavis.edu) Back in May the Florida Nurserymen and Growers Association (FNGA) issued a press release announcing that it is urging a halt in sales of 11 invasive plant species. FNGA issued the release jointly with the Florida Exotic Pest Plant Council (FLEPPC) which had identified 24 species which are both invasive and grown commercially in the state. Eleven of the 24 were identified as being of relatively minor value in the current market and FNGA decided to recommend that these 11 species no longer be propagated, grown or marketed in Florida. The 11 plants are Albizia lebbeck (Woman's tongue), Bauhinia variegata (Orchid tree), Bischofia javanica (Bischofia), Cupaniopsis anacardioides (Carrotwood), Macfadyena unguis-cati (Cat's claw vine), Melia azedarach (Chinaberry), Nephrolepsis cordifolia (Sword fern), Psidium guajava (Guava), Rhoeo spathacea (Oyster plant), Syzgium cumini (Java plum; jambolan), and Thespesia populnea (Seaside mahoe). FNGA represents Florida's leading 1,900 nurseries, landscapers, garden retailers and allied suppliers. Further recommendations of species whose sales should be halted will be based on information and recommendations being developed by the University of Florida Institute of Food and Agricultural Sciences (IFAS). Doria Gordon, TNC's Florida ecologist, serves on both the FLEPPC Board and the IFAS committee charged with making recommendations on invasive species. American Nurseryman magazine published an 'Invasives Roundtable' in its July 15 1999 issue (v. 90 no. 2 pages 54-77). The magazine asked nine horticulture professional and conservation workers to each answer seven questions on the topic including how they define 'invasive', what the nursery industry should do about invasives and what impacts on the industry can be expected. All replies were printed in full. Sarah Reichard of the University of Washington and I were the two conservation workers invited to participate. I was impressed and pleased with how well most of the horticulture professionals who replied understand the problem and with the willingness to take actions to help address it indicated by several of them. Contact Barry or John for copies of the 'Roundtable'. |
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