Abstract:
Screening of
Ficus racemosa (leaf and stem) and
Momordica charantia (Stem) extracted in petroleum ether, CHCl
3 and CH
3OH were conducted through lethality against Brine shrimp
Artemia salina L. nauplii, dose-mortality and repellent activity against
Tribolium castaneum (Hbst.) adults. For Pet. ether extract of
F. racemosa leaf and stem the lethality against
A. salina nauplii were LC
50 72.62, 38.78, 20.47 and 16.78ppm and 1802.91, 137.67, 57.14 and 27.33ppm for 12, 18, 24 and 30h of exposure respectively. For CHCl
3 extract the were 218.67, 187.76, 38.96 and 15.20ppm and 191.94, 62.15, 39.85 and 23.84ppm respectively; while for the CH
3OH extracts the LC
50 values were -, 525.15, 107.71 and 41.67ppm and 47.83,41.42, 26.91 and 20.20ppm for 12, 18, 24 and 30h nof exposure respectively. For Pet. ether extract of
M. charantia stem no mortality was recorded, however the CHCl
3 and CH
3OH of the same offered LC
50 values 69.58, 25.00, 23.02 and 16.20ppm and 91.83, 28.15, 20.18 and 15.22ppm respectively for 12, 18, 24 and 30h of exposure respectively. For
F. racemosa leaf and stem and
M. charantia stem extracts of Pet.ehter and CH
3OH extracts no insecticidal activity was recorded, while the CHCl
3 extract gave mortality to the beetles of
T. castaneum. The LD
50 values for
F. racemosa leaf and stem were 32.27, 4.14, 3.64, 3.34 and 3.05 and 7.57, 5.21, 3.84, 2.65 and 1.72mg cm
-2 respectively after 24, 30, 36, 42 and 48h of exposure respectively; and for
M. charantia stem these were 5.97, 4.99, 3.82, 3.09 and 2.89mg cm
-2 respectively for the same exposure time. In repellent activity test, the CHCl
3 leaf extracts of
F. racemosa and the CHCl
3 stem extracts of
M. charantia found abstemiously repellent (
P<0.01) and the CH
3OH leaf extracts of of
F. racemosa showed mild repellency (
P<0.05) against
T. castaneum between dose levels while the Pet.E. leaf extracts, CHCl
3 stem extract of
F. racemosa and CH
3OH stem extracts of
M. charantia didn’t show any significant repellent activity.