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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)
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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.
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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.
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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://tncinvasives.ucdavis.edu/tools/kutnkill.html
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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.