| dc.creator |
Mwingira, V.S |
|
| dc.creator |
Mayala, Benjamin K |
|
| dc.creator |
Senkoro, Kesheni P |
|
| dc.creator |
Rumisha, Suzan F |
|
| dc.creator |
Shayo, E.H |
|
| dc.creator |
Mlozi, Malongo R.S |
|
| dc.creator |
Mboera, Leonard E. G |
|
| dc.date |
2018-05-02T06:50:20Z |
|
| dc.date |
2018-05-02T06:50:20Z |
|
| dc.date |
2009 |
|
| dc.date.accessioned |
2022-10-25T08:51:43Z |
|
| dc.date.available |
2022-10-25T08:51:43Z |
|
| dc.identifier |
https://www.suaire.sua.ac.tz/handle/123456789/2127 |
|
| dc.identifier.uri |
http://hdl.handle.net/123456789/91681 |
|
| dc.description |
Research article |
|
| dc.description |
Azolla (Salviniales: Azollaceae) is known to reduce oviposition and adult emergence of a number
of mosquito species. Several species of Azolla are reportedly indigenous to Tanzania. However, the potential
of Azolla as a biocontrol agent against malaria mosquitoes has not been evaluated in the country. This crosssectional
study was carried out to assess mosquito larval productivity in irrigated rice-fields infested with Azolla
in Mvomero District, Tanzania. A systematic larval sampling covering all open water bodies along designed
transect was carried in rice-fields. Larval density was estimated by dipping water bodies with or without
Azolla. The degree of Azolla coverage was categorized as 0%, <50%, 50%, and >80%. Larvae densities were
categorised as low (<50/m2), medium (50-500/m2) and high (≥500/m2) productivity. A total of 120 water bodies
were surveyed and 105 (87.5%) had Azolla microphyla and A. pinnata at varying degrees of coverage. Of the total
105 water bodies with Azolla, 80 (76.2%) had a green Azolla mat, and 25 (23.8%) a brown Azolla mat. Eightyeight
(73.3%) of the sites were infested with anophelines and 109 (90.8%) with culicine larvae. Seventy percent
of all water bodies contained anophelines and culicines in sympatric breeding, while 20.8% and 3.3% had only
culicines and anophelines, respectively. The majority (82%) of mosquito breeding sites were found in area with
Azolla substrate. Mosquito larva productivity was low in sites with highest (>80%) Azolla coverage. Seventytwo
(81.8%) of the anopheline and 90 (82.6%) culicine breeding sites were infested with Azolla. Water bodies
infested with green Azolla were more productive than those covered by brown coloured Azolla substrates for
both culicines (13%) and anophelines (8%). Of the 1537 field collected larvae that hatched to adult stage, 646
(42.03%) were Anopheles gambiae s.l., 42 (2.73%) were An. funestus and 769 (50.03%) were Culex quinquefasciatus.
These findings suggest that the mosquito productivity is low when the Azolla coverage is high (>80%). The
promotion of Azolla in mosquito control should take into consideration the degree of Azolla coverage. |
|
| dc.description |
Amani Medical Research, National Institute for Medical Research, SUA |
|
| dc.format |
application/pdf |
|
| dc.language |
en |
|
| dc.publisher |
Tanzania Journal of Health Research |
|
| dc.relation |
Tanzania Journal of Health Research;1 |
|
| dc.subject |
Azolla |
|
| dc.subject |
Mosquito |
|
| dc.subject |
Larval productivity |
|
| dc.subject |
Rice fields |
|
| dc.subject |
Tanzania |
|
| dc.title |
Mosquito larval productivity in rice-fields infested with Azolla in Mvomero District, Tanzania |
|
| dc.type |
Article |
|