Evaluation of Some Plants for their Repellency against Some Anopheline and Culicines Mosquitoes in Kolm-Negewo (Central Ethiopia)
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Date
2005-07
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Addis Ababa University
Abstract
To evaluate and compare the repellency of 7 different local plants against diflcrcnt mosquitoL's.
investigations wcrc macle by using fleld experimcnts in Koka NegeIVo village ahoul <!4kms Ilil IhL'
road between Addis-Ababa and ;\wassa. The experiments were conducted inside hOllses hy using
t~)tll' human volunteers in lour replicates tewelve ditlerent times in tile total or 48 days. Humin!!
of the plants was made by placing parts on burning charcoal stoves while the thermal expulsion
was done byplaeing the plant parts on smallmelal plates on burning st(wes. Fresh I'art "'IS leslL'ci
by placing them on a plate and raised 35cms in rront orthe mosquito collectors. ilireet hurning Ili'
seeds of R. challepellsis, S. lIIolle and ,II azedarach provided 78.9'1.,., 58.3% anci 54 . .>')';,
repellency against All. arabiellsis rcspectively. Highest repcllcncy showed with the seed or II.
cila//apellsis (1'<0.001). The seed or this plant showed similar effee( on AI/. plwmci/sis and
Culicines. In the contrary All. araiJiellsis was more repelled by hurning thc kavcs 01'.\ /1/,,//,'
(1'<0.05) than the leaves of R. cilallepellsis mid M azedarach.
Direct burning J>. a/Jyssillica, 0. /alll(til!illlll showed remarkable repellency against All.
arabiellsis (1'<0.05). However, less protection was exhibited to thc other two mosquito species.
Less repellency against all the three mosquito species has been (,hlainL'" Iw F gl"h"/,,,\ in ,U)I
(est methods. Burning or !lowers. leaves and seeds of L. C(fJI/(//'(/ exhihil similar bUI signiliL"lnl
repellency (P<O.05) against the two Anopheline species. However., no remarkable repellency IVas
exhibited against the culicines.
Only seed of R. challepellsis showed good repellency to All. arahiellsis than the seeds of'S 1I/0/1e
and M. azedal'ach in the application or thermal expulsion or their volatiles. In conlrast IllreL' "i'
lile plant seeds were iound less protective to All. pilaroellsis. On the other hand Ihermal L'xpulsi'1l1
of volatiles ii-om leaves of same plants well protected All. arahicIIsis. L.ess repellency elkct was
obtained by tilermal expulsion of volatiles l1'om leaves P. aiJyssillica, F. g/ohll/lls and 0.
/allli/iJ/i11ll1 against the three mosquitoes. All parts or L. ('(fJ}/(Ira signilic<lntly repelled .111.
(J}'(J/Jiellsis only.
Fresh leaves of R. cila/epellsis provided appreciable protection against the t\Yo }\nophclillL'
species. ;/11. pharocIIsis also well protected by tt'esh leaves of M. azcda}'(Jch and S'. lIIolle. 0.
/allli(iJ!iIlIll, P. aiJyssillica and E. g/obll/lls (ailed to protect well /111. arahiellsis. Ilowt'wr. thL'
Jormer two repelled All. pharoellsis. On the other hand all tile rresh parts or r. ClIIII({m i'liled [(I
Vll
protect against the three mosquito species. llowever, signilieanl repellency pOlenlial has been
obtainedli'OI11 placing the seed part of the plant, but only to All. p/wroellsis (1'<0.05).
As the plants arc locally available they can be easily used for mosquito protection by the local
communities, it is suggested to integrate them with other vector control options. ~·lorC()VlT.
further investigations are required to evaluate the oils extracted Ii-om these plants.
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Evaluation of Some Plants for their Repellency