INDUCTION OF MALE STERILITY IN SILKWORM UZI FLY, Exorista bombycis (Louis) - A PARASITOID OF SILKWORM, Bombyx mori L.
Loading...
Date
2014-08-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences GKVK, Bangalore
Abstract
The investigations on the “Induction of male sterility in silkworm
uzi fly, Exorista bombycis (Louis) - A parasitoid of silkworm, Bombyx
mori L.” was carried out during 2011-2014 at the Department of
Sericulture, University of Agricultural Sciences, GKVK in collaboration
with National Center for Biological Sciences, Bangalore for gamma
irradiation. The highest uzi fly emergence (89.79%), mating duration
(1.56hr) and mating percentage (88.56 %) was recorded in male flies
emerged from 8 day old irradiated pupae at 2kr compared to other treated
batches. Whereas, the normal female flies mated with sterile males
emerged from 8 day old irradiated pupae at 2kr recorded maximum preovipositional
period (32hr) and fecundity (510). The maximum time taken
for sclerotization (70, 65 and 63.54 min.) by male flies that emerged from 3
day old irradiated pupae at 1, 1.5 and 2kr respectively as compared to
control.
The minimum ovipositional period (3days), number of fertile eggs
(110) and hatching percentage (24.81%) was recorded in normal females
mated with sterile males emerged from 8 day old irradiated pupae at 2kr.
Studies on field release of sterile male flies near rearing houses resulted in
decreased hatching percentage (17.38%) compared to un released village.
Mass production of uzi maggots in-vitro revealed that 2 mated females
provided with 300 worms for oviposition resulted in maximum fecundity
(657), maggots formed (562), pupae formed (544), flies emerged (534), male
pupal weight (1.26 g), female pupal weight (0.96/g), male pupal length
(0.91cm) and female pupal length (0.97cm) compared to 50 , 100 and 200
silkworms provided batches.
Description
Keywords
null