| Summary: | 碩士 === 國立中興大學 === 昆蟲學系 === 82 === The extract of the Dacus dorsalis Hendel male accessory gland
was injected into the virgen female. It was found that when the
concentration of the extract was higher than 0.025 MAG/ 0.5μ
ｌ, the preoviposition period was evidently shortened to 10.6
days in contrast to 13.8 days of the control group. However ,
the injection of the testis extract did not influence the
preoviposition period. It ,therefore , could be inferred that
through mating , the insemination of the male accessory gland
extract to the female would physiologically affect the female.
The extract of the accessory gland of the male D. cucurbitae
was injected into the virgin female D. dorsalis and it was
found that the extract shortened her preoviposition period , as
that of the male D. dorsalis does. Therefore , the male
accessory gland of D. dorsalis is not species - specific. The
injection of the haemolymph of the mated female into the virgin
female D. dorsalis would also shortened the preoviposition
period. 12.1 days were required for the female D. dorsalis to
oviposit after the injection of the virgin female haemolymph in
contrast to 9.0 days after that of the mated female's. This
showed that , after mating , a substance existed in the female
body which promoted the oviposition. However, by the injection
of 10 , 100 and 1000 ppm of juvenile hormone III to the male D.
dorsalis one day old afetr his emergence for 9 days
observation, the length of the male accessory gland was not
significantly different from that of the males' for the
untreated group and the group which injected with distilled
water.
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