Evaluation
of larvicidal efficacy of Solanum xanthocarpum storage against
vector mosquitoes in north -
western Rajasthan
S.K. Bansal*1, Karam
V. Singh1
and M.R.K. Sherwani2
1Desert
Medicine Research Centre (ICMR), New Pali Road, Jodhpur
- 342 005, India
2Department
of Chemistry, JNV University, Jodhpur -
342 005, India
(Received:
June 11, 2008;
Revised received: October
08, 2008; Accepted: October 11, 2008)
Abstract: Efficacy of
the methanol extracts from fruits without seeds, whole yellow ripe fruits and
seeds of the plant Solanum xanthocarpum
was evaluated against larvae of Anopheles culicifacies,
Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus, the important vector mosquitoes prevalent
in the arid region.? Experiments were
carried out on late 3rd or early 4th instar
larvae of these mosquitoes using standard WHO technique. 24 and 48 hr LC50
and LC90 values along with their fiducial
limits, regression equation, chi-square (x2)/ heterogeneity of the
response have been determined by log probit regression
analysis. The 24 hr LC50 values as observed for fruit without seeds,
whole fruits and seeds after six months were 79.6, 91.7 and 131.7; 131.4, 186.9
and 195.6; 273.4, 290.9 and 377.6 and 384.9, 450.6 and 520.0 mgl-1
for An. culicifacies, An. stephensi,
Ae. aegypti
and Cx. quinquefasciatus
respectively. However, the 24 hr LC50 values for fresh yellow ripe
fruits and seeds determined previously were??
51.6 and 66.9; 52.2 and 73.7; 118.3 and 123.8 and 157.1 and 154.9 mgl-1
for the above four vector species respectively showing that the efficacy
was decreased two to three times more after six months of storage. The 24 hr LC50
values were also determined after one year of storage for fruit without
seeds, whole fruits and seeds. The values were 103.3, 120.1 and 195.7; 146.3,
224.3 and 251.2; 316.9, 336.5 and 426.2 and 393.0, 500.3 and 656.7 mgl-1 ?as compared to the 24 hr
LC50 values of 47.4,51.6 and 66.9; 52.3,52.2 and 73.7;? 108.0,118.3 and 123.8 and? 141.1, 157.1 and 154.9 mgl-1 of
all the three fresh preparations for the above four vector species
respectively showing that the efficacy was further decreased after one year of
storage. Further the extracts should be used when they have been prepared from
the fresh plant parts instead of the old stored parts. Larvae of anophelines were found more susceptible as compared to culicine. HPLC and IR studies showed that active component
might be present in the fruits and seeds of this plant species. The study would
be of great importance while planning vector control strategy based on
alternative plant derived insecticides.
Key words: Larvicidal, Solanum xanthocarpum,
Vector mosquitoes, Arid region
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