Page 59 - PARVEEN, S
P. 59
mortality was measured by surface film treatment Contact and fumigant toxicity of the three essential
method at different doses of the complexes. The oils, viz., cardamom (Elletaria cardamomum
results showed that the LD 50 values as recorded Maton), Cinnamon (Cinnamomum aromaticum
after 24 hours of treatment were 0.6173, 0.4500, Nees), and Clove (Syzygium aromaticum (L.)
-2
0.5697 and 0.6188 mg cm for Ni(II)-cystine, Merr. and petry) were tested against the red flour
Cd(II)-cystine, Hg(II)-cystine and Pb(II)- cystine beetle, Tribolium castaneum (Herbst) larvae and
-2
respectively as compared with 0.2416 mg cm for adults. Residual film bioassay was employed in
the standard insecticide λ-cyhalothrin. Still lower Petri dish (5 cm dia.) for contact toxicity studies
LD 50 values were obtained when recorded after 48 and 6cm x 1.8cm glass vials were used for testing
hours of treatment. These metal-cystine complexes fumigation actions. Three day old adults and 10-
were found to be biodegradable and their half-lives day old larvae were equally susceptible to the
varied approximately from 60 to 110 hours when contact toxicity of cinnamon oil, with LD 50 values
-2
dissolved in aqueous medium. These compounds of 0.074 and 0.196 mg cm respectively.
may, therefore, be used as effective insecticides. Cardamom oil provided higher toxicity to 14-day
and 18- day old larvae having LD 50 value of
-2
182 KHALEQUZZAMAN, M. & SULTANA, 0.10mg cm . In fumigation bioassay cinnamon oil
S. (Institute of Biological Sciences, Rajshahi provided the highest toxicity to adult and 10-, 14-,
University, Rajshahi). INSECTICIDAL ACTIVITY and 18-day old larvae, with LD 50 values of 0.03,
-3
OF ANNONA SQUAMOSA L. SEED EXTRACTS 0.05, 0.088 and 0.09 mg cm respectively.
AGAINST THE RED FLOUR BEETLE, Furthermore, 10-day old larvae were more tolerant
TRIBOLIUM CASTANEUM (HERBST). J. Bio- than the adults to the contact toxicity of the
Sci., 2006, 4 , 107-112. essential oils, but 14- day old larvae had the same
susceptibility as the adults, In contact and
Insecticidal activity of the seed extracts of custard fumigation toxicity adults and all stages of larvae
apple, Annona squamosa L. in petroleum spirit, were more resistant to clove oil.
ethyl acetate, acetone and methanol against Raj,
CR 1, FSS II and CTC-12 strains of the red flour 595.77 ZOOLOGY : DIPTERA
beetle, Tribolium castaneum (Herbst) was studied.
The seeds were dried, powdered and extracted in 184 AHMED, T.U.; BANU, N.N. (IEDCR,
0
Soxhlet's apparatus in the solvents below 60 C. Dhaka) ; RAHMAN, G.M.S. ( Dept. of Zoology,
Extractions were applied on larvae and adult National University); SHAMSUZZAMAN, M.
beetles in film-residue methods and mortality was (Dept. of Zoology, Feni Govt. College, Feni) ;
recorded after 24 h. For larval bioassay the highest BASHAR, K. ( Dept. of Zoology, Jahangirnagar
toxicity was recorded for petroleum spirit extract University, Savar, Dhaka); SAMAJPATI, S.
-2
(LD 50=0.03µg cm ) in Raj strain and the lowest (Jagannath University, Dhaka); SULTANA, S.
toxicity was for methanol extract (LD 50=15.697µg (Eden College, Dhaka); Hossain, M.I. (West
-2
cm ) in FSS II strain. In adults petroleum spirit Moad Hospital, Dept. of Medical Entomology,
extract offered highest toxicity (LD 50=58.697µg Sydney University, Australia) & RAHMAN, M.S.
-2
cm ) in CTC 12 strain and the lowest toxicity (Dhaka City Corporation, Dhaka). SEASONAL
-2
(LD 50=22004.710µg cm ) was for acetone extract PREVALENCE OF DENGUE VECTOR
in CR 1 strain. LD 50, 95% confidence limits and MOSQUITOES IN DHAKA CITY,
regression equations are presented. BANGLADESH. Bang. J. Zool., 2007, 35(2), 205-
212.
183 MONDAL, M. & KHALEQUZZAMAN,
M. (Dept. of Zoology, Rajshahi University, The seasonal prevalence of Aedes aegypti and Ae.
Rajshahi). TOXICITY OF ESSENTIAL OILS albopictus was studied in Dhaka city, Bangladesh,
AGAINST RED FLOUR BEETLE, TRIBOLIUM from December 2001 to August 2002. The larvae
CASTANEUM (HERBST) (COLEOPTERA : of the mosquitoes were collected from both indoor
TENEBRIONIDAE). J. Bio-Sci., 2006, 14 , 43-48. and outdoor of all types of houses in the urban area
of Dhaka city. Ae. aegypti and Ae. albopictus were
52
