THE EFFECT OF CERTAIN BIGPESTICIDES AND IRRADIATIGN GN THE DEVELOPMENTAL STAGES OF MYIASIS PRODUCING FLIES
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Date
1998
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES Mannuthy - Thrissur
Abstract
A Study was undertaken on the prevalence of cutaneous
myiasis in domestic animals and its control using biopesticides
and gama ray irradiation.
The prevalence of cutaneous myiasis in domestic animals
were found to be 205 (2.08 per cent) among the 9861 animals
screened. The peak of infestation was noted in the month of
January. In-host-wise and parasite-wise the highest incidence
was noted in cattle (63.41 per cent) and the majority of
infestation was produced by Chrysomyia bezziana larvae (90.73
per cent) . Methoprene at 1 to 50 ppm concentration caused
only moderate mortality on larvae but significantly increased
the mortality rate on eggs, prolonged the larval phase,
increased the formation of larval pupal intermediaries and
adult deformities and reduced the adult emergence.
Diflubenzuron at 0.5 to 5 ppm caused 55 to 100 per cent
larvicidal effect due to lowered chitin content of 18.42 to
52.11 per cent in larval cuticle. Bacillus thuringiensis var
israelensis produced only moderate larval mortality at 160 to
800 ppm in myiasis producing flies. Azadirectin at 10.5 to 15
ppm produced 100 per cent mortality in eggs and larvae.
Significant antifeedant, ovipositional deterrent and repellant
effects were also produced by Azadirectin. Among the extracts
of Acorus calamus, studied, petroleum ether extract at 2.5
per cent concentration gave 82.5 to 100 per cent mortality of
the larvae. Moderate antifeedant, ovipositional deterrent and
repellant effects were also noticed. The petroleum ether
extract produced 100 per cent sterility at 0.1 to 1 per cent
concentration by preventing the development of ovarian
follicles. Three day old pupae of myiasis producing flies
exposed to rays gave excellent sterility effect at 2000 to
4000 rads radiation exposure without any other deleterious
effect in the flies. Diflubenzuron at 5 ppm concentration
showed the highest larvicidal effect. (88.5 per cent) in
natural cases of cutaneous myiasis.
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