| dc.creator |
Kanagwa, Warda |
|
| dc.date |
2020-11-18T09:57:27Z |
|
| dc.date |
2020-11-18T09:57:27Z |
|
| dc.date |
2020-06 |
|
| dc.date.accessioned |
2022-10-25T09:19:14Z |
|
| dc.date.available |
2022-10-25T09:19:14Z |
|
| dc.identifier |
https://dspace.nm-aist.ac.tz/handle/20.500.12479/1014 |
|
| dc.identifier.uri |
http://hdl.handle.net/123456789/94858 |
|
| dc.description |
A Dissertation Submitted in Partial Fulfilment of the Requirements for the Degree of
Master’s in Life Sciences of the Nelson Mandela African Institution of Science and
Technology |
|
| dc.description |
This study assessed the methods which are likely to be biologically and socio-economically
effective to control the invasive species P. hysterophorus in Arusha Tanzania. A variety of
methods have been found ineffective in long-term control of P. hysterophorus. Thus, an
effective integrated approach needs to be identified. In addition, perception and socioeconomic
consequences about P. hysterophorus by farmers and pastoralists are still poorly
understood. The study assessed the effect of a newly implemented bio-control agent,
Zygogramma bicolorata, in 4 m
2
field plots. Further a novel approach of controlling P.
hysterophorus was tested by using herbicidal extracts of the naturalized plants Dovyalis caffra
and Cassia auriculata and compared it with 2,4-D. Finally, 123 farmers and 128 pastoralists in
Mbuguni, Olasiti, Murieti and Sepeko wards were interviewed. It resulted that Z. bicolorata,
particularly at highest population densities, is capable of reducing height of P. hysterophorus
by 87% and biomass by 91%. There was a significant reduction (50%) in the measured
parameters after application of low concentration of extracts of C. auriculata leaves and bark
and D. caffra leaves and fruits (DcL and DcF). Invasion of farm fields by P. hysterophorus
leads to yield reduction by half according to 21% of farmers, and 46% of farmers claimed that
their income was negatively affected. Therefore, this study suggests the use of environmentally
friendly bio-herbicides since it can foster P. hysterophorus control and emphasize that this
method should be integrated with Z. bicolorata in the infestation areas for long-term
suppression of P. hysterophorus. |
|
| dc.format |
application/pdf |
|
| dc.language |
en |
|
| dc.publisher |
NM-AIST |
|
| dc.rights |
Attribution-NonCommercial-ShareAlike 4.0 International |
|
| dc.rights |
http://creativecommons.org/licenses/by-nc-sa/4.0/ |
|
| dc.subject |
Research Subject Categories::NATURAL SCIENCES |
|
| dc.title |
Effectiveness of biological control and socioeconomic impacts of the invasive parthenium hysterophorus in Arusha, Tanzania |
|
| dc.type |
Thesis |
|