| dc.creator |
Mkenda, Prisila |
|
| dc.creator |
Mwanauta, Regina |
|
| dc.creator |
Stevenson, Philip |
|
| dc.creator |
Ndakidemi, Patrick |
|
| dc.creator |
Mtei, Kelvin |
|
| dc.creator |
Belmain, Steven |
|
| dc.date |
2019-05-24T07:54:43Z |
|
| dc.date |
2019-05-24T07:54:43Z |
|
| dc.date |
2015-11-23 |
|
| dc.date.accessioned |
2022-10-25T09:20:34Z |
|
| dc.date.available |
2022-10-25T09:20:34Z |
|
| dc.identifier |
DOI:10.1371/journal.pone.0143530 |
|
| dc.identifier |
http://dspace.nm-aist.ac.tz/handle/123456789/193 |
|
| dc.identifier.uri |
http://hdl.handle.net/123456789/95045 |
|
| dc.description |
Research Article published by Plos One |
|
| dc.description |
Plants with pesticidal properties have been investigated for decades as alternatives to synthetics,
but most progress has been shown in the laboratory. Consequently, research on
pesticidal plants is failing to address gaps in our knowledge that constrain their uptake.
Some of these gaps are their evaluation of their efficacy under field conditions, their economic
viability and impact on beneficial organisms. Extracts made from four abundant weed
species found in northern Tanzania, Tithonia diversifolia, Tephrosia vogelii, Vernonia amygdalina
and Lippia javanica offered effective control of key pest species on common bean
plants (Phaseolus vulgaris) that was comparable to the pyrethroid synthetic, Karate. The
plant pesticide treatments had significantly lower effects on natural enemies (lady beetles
and spiders). Plant pesticide treatments were more cost effective to use than the synthetic
pesticide where the marginal rate of return for the synthetic was no different from the
untreated control, around 4USD/ha, compared to a rate of return of around 5.50USD/ha for
plant pesticide treatments. Chemical analysis confirmed the presence of known insecticidal
compounds in water extracts of T. vogelii (the rotenoid deguelin) and T. diversifolia (the sesquiterpene
lactone tagitinin A). Sesquiterpene lactones and the saponin vernonioside C
were also identified in organic extracts of V. amygdalina but only the saponin was recorded
in water extracts which are similar to those used in the field trial. Pesticidal plants were better
able to facilitate ecosystem services whilst effectively managing pests. The labour costs
of collecting and processing abundant plants near farm land were less than the cost of purchasing
synthetic pesticides. |
|
| dc.format |
application/pdf |
|
| dc.language |
en_US |
|
| dc.publisher |
Plos One |
|
| dc.subject |
Research Subject Categories::FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING |
|
| dc.title |
Extracts from Field Margin Weeds Provide Economically Viable and Environmentally Benign Pest Control Compared to Synthetic Pesticides |
|
| dc.type |
Article |
|