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|Title: ||Vegetative regeneration and distribution of Fallopia japonica and Fallopia x bohemica: implications for control and management|
|Authors: ||Child, Lois E.|
|Keywords: ||Plant invasions|
Fallopia x bohemica
Geographical information systems
|Issue Date: ||1999|
|Publisher: ||© Lois Elizabeth Child|
|Abstract: ||Fallopia japonica (Houtt.) Ronse Decraene (Japanese knotweed), an introduced, invasive,
rhizomatous perennial plant, has become an increasing problem for nature conservation
and land management in both rural and urban areas in the British Isles. In the native
range of the plant, Japan, Taiwan and northern China, a number of varieties are recorded.
Three congeners of F. japonica are present in the British Isles, F. sachalinensis, F.
japonica var. conipacta and F. baldschuanica in addition to a hybrid F. x bohemica. An
investigation by postal survey of the distribution of the hybrid F. x bohemica has
identified 131 records for the British Isles. Both male and female plants of F. x bohemica
have been recorded. Current understanding suggests that only female plants of F.
japonica are present in the British Isles, inferring that the only means of reproduction is
through vegetative regeneration. High rates of regeneration were recorded in this study
for stem and rhizome material for both F. japonica and F. x bohemica in an aquatic and
terrestrial environment. Implications of vegetative regeneration are discussed in terms of
current management practices and future methods of control. A combination of digging
with a mechanical excavator followed by spraying with the herbicide glyphosate
decreased the time required to achieve an effective level of control of F. japonica
compared to spraying alone. Fragmentation of the rhizome system through digging
resulted in an increase in stem density allowing a more effective delivery of herbicide.
Implications in terms of costs for F. japonica treatment on sites awaiting re-development
are discussed. Analysis of data collated from surveys of F. japonica in Swansea using a Geographical Information System suggest that the primary habitats infested are waste
ground and stream and river banks. Results suggest that disturbance, both by natural
means and by human intervention has been the primary cause of spread of F. japonica in
the British Isles. Management strategies are proposed which take account of these results
and measures are put forward to help prevent future infestations.|
|Description: ||Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Geography and Environment)|
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