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170 CHOWDHURY, S.F.N. & RAHMAN, Gazipur). SUSCEPTIBILITY OF CULEX
M.F. (Dept. of Zoology, Dhaka University, QUINQUEFASCIATUS AND AEDES
Dhaka). ANATOMY AND HISTOLOGY OF AEGYPTI FROM BANGLADESH TO SOME
THE ALIMENTARY CANAL OF THE BEETLE, SYNTHETIC INSECTICIDES. Bang. J. Zool.,
NECROBIA RUFIPES DE GEER (COLEOPTERA 2006, 34 (2), 163-171.
: CLERIDAE). Bang. J. Zool., 2007, 35 (2), 223- The second generation adults of Culex
237. quinquefasciatus Say and Aedes aegypti (L.)
obtained from field collected larvae from Dhaka
The alimentary canal of Necrobia rufipes DeGeer City and a rural area of Narshingdi District of
is about one and a half times longer than its body Bangladesh were exposed to insecticide
length. It is clearly divisible into foregut, midgut impregnated papers in the laboratory. The adults of
and hindgut. The foregut is distinguishable into Cx. quinquefasciatus of both the areas were
pharynx, oesophagus and proventriculus. There is resistant to all seven tested insecticides, namely
no division in the midgut, the surface of which is DDT, malathion, fenitrothion, propoxur,
provided with numerous short regenerative crypts. deltamethrin. Lamda-cyhalothrin and permathrin.
The hindgut consists of a pyloric chamber, ileum, Ae. aegypti from Dhaka city was resistant to DDT,
colon and rectum.The colon is divisible into propoxur and fenitrothion. but susceptible to
anterior colon and posterior colon. A malathion, deltamethrin, lambda-cyhalothrin and
proventricular invagination is present. The permethrin.The larvae from similar batches of
epithelium of the foregut and hindgut is formed of adults were also exposed to insecticide emulsions.
cuboidal cells. The midgut consists of columnar Cx. quinquefasciatus larvae from both the places
epithelial cells and regenerative cells. Regenerative and Ae. aegypti larvae from Dhaka were resistant
crypts are formed by the midgut epithelium. A against three organophosphates (pirimiphos-
peritrophic membrane is present. The visible methyl, malathion and fenitrothion) and one
secretion of the midgut is merocrine type. pyrethroid (permethrin). but susceptible to two
organophosphates (phenthoate and chlorpyrifos)
171 CHOWDHURY, S.F.N. & RAHMAN, and three pyrethroids (cypermethrin, deltamethrin
M.F. (Dept. of Zoology, Dhaka University, and Lambda-cyhalothrin).
Dhaka). ANATOMY AND HISTOLOGY OF
THE MALPIGHIAN TUBULES OF NECROBIA 173 ISLAM, K.A.; ORWIN, D. &
RUFIPES DE GEER (COLEOPTERA: KHAMBAY, B.P.S. (Faculty of Science,
CLERIDAE). Bang. J. Zool., 2008, 36 (1), 27-34. Technology and Design, University of Luton, UK).
INSECT RESISTANCE TO PYRETHROIDS.
The hindgut of Necrobia rufipes posseses pyloric Bang. J. Zool., 2006, 34 (2), 173-179.
chamber, ileum, colon and rectum. The posterior
region of colon and anterior ‘rectal pad’ region of Two clones of Aphis gossypit (clone 171B of U.K.
rectum include a cryptonephridial chamber containing origin and clone Adana of Turkey origin) were
long, slender and slightly convoluted Malpighian reared and treated against Cypermethrin,
tubules. Six cryptonephridic Malpighian tubules open Bifenthrin. Fenfluthrin, Deltamethrin. NRDC 196.
into the pyloric chamber. The cells of Malpighian BTG502 and RH63421. The pyrethroids were
tubules are characterized by loosely packed treated with two replications against topical
microvilli. Brush borders are also present in the application method and leaf dip method.
free part of the Malpighian tubules. Pyrethroids, BTG502 and RH63421 were
confirmed as the high level of resistant strain
172 HOSSAIN, M.I.; (Dept. of Zoology, Dhaka (Turkey Adana) and susceptible strain (171B). The
University, Dhaka); WAGTSUMA, Y. (Epidemic topical application gave more reproducible results
Control Preparedness Programme, Public Health with higher confidence limits than the leaf-dip
Sciences Division, ICDDR, B, Dhaka); method.
CHOWDHURY, M.A. (Safeway Pest Control,
Banani, Dhaka) & RAHMAN, G.M.S. (Faculty of 174 ISLAM, M.S. (Dept. of Entomology, Kentucky
Life and Earth Science, National University, University, Lexington, USA). IMPACTS OF FOOD
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