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The Global Invasive Species Team | |
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Global Invasive Species Team listserve digest #083 Fri Apr 27 2001 - 15:42:29 PDT --CONTENTS-- 1. Portable spray rigs (Georgia) 2. Cypress spurge (Illinois) 3. New tool review (Nationwide) 4. Recent weed literature (Nationwide) --------------------------------------- 1. Portable spray rigs (Georgia) From: Wayne Owen (wowen(at)fs.fed.us) I was hoping you could point in the direction of some useful information. I am looking for a source of portable (i.e., field capable) equipment spray rigs--the sort of thing you could hose mud and plant fragments off of a skidder of log-loader with. I am not sure where to go, or even what to call such things. I am trying to convince the staff of several of our national forests that it would be in their best interest to have one or more of these machines around. If you can help, that would be great. --------------------------------------- 2. Cypress spurge (Illinois) From: Debra Nelson (dnelson(at)dnrmail.state.il.us) Cypress spurge (Euphorbia cyparissias) has been a long-term management problem at Illinois Beach State Park, and I would like to find out if other managers have found anything to successfully eradicate this plant from high quality wet sand prairie or panne communities. --------------------------------------- 3. New tool review (Nationwide) From: Barry Rice (bamrice(at)ucdavis.edu) I reviewed another kind of "herbicide shears" for the Wildland Invasive Species Team web site. Really just a pair of ratchet shears with a little bottle of herbicide attached for convenience, this thing looks a little bogus but is actually reasonably effective. The cost is $40. By the way, somehow I had managed to overlook ratchet shears until this point in my life, and am pretty thrilled by the discovery! See: http://tncweeds.ucdavis.edu/tools/kutnkill.html --------------------------------------- 4. Recent weed literature (Nationwide) From: John Randall (jarandall(at)ucdavis.edu) Article on impacts of bush honeysuckle Gould, A.M.A., and D.L. Gorchov. 2000. Effects of the exotic invasive shrub Lonicera maackii on the survival and fecundity of three species of native annuals. American Midland Naturalist 144: 36-50. The authors established plots in two forested sites in southwestern Ohio, one site has a history of logging, burning and grazing and was more invaded, the other has had little human-caused disturbance over the past 100 years. At each sites paired plots were randomly assigned a 'leave honeysuckle' or 'remove honeysuckle' treatment and at the less disturbed site uninvaded plots were also included. The plots were cleared of existing herbaceous plants by clipping and planted with Galium aparine, Impatiens pallida and Pilea pumila seedlings. Survival of G. aparine and I. pallida and fecundity (number or mass of seeds per plant) of all three species was significantly higher in the 'remove honeysuckle' plots than in the 'leave honeysuckle' plots at the more disturbed site. There was no effect of the treatments on survival at the less disturbed site but fecundity of I. pallida and P. pumila was higher in the 'remove honeysuckle' plots there. At both sites fitness (survival x fecundity) was highest for all three species in the removal plots and lowest where bush honeysuckle was present. The authors note that this study did not determine the mechanism responsible for the suppression of the native annuals documented here but they suggest it may be competition for light by the bush honeysuckle. They note that bush honeysuckle leafs out earlier and retains its leaves longer in the autumn than native deciduous shrubs and trees. They also note that this study does not indicate whether the negative effects they documented were due to specific traits of the bush honeysuckle or to a shrub layer in general because the native shrub layer was absent or sparse at the two locations. |
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