| Summary: | 碩士 === 國立中興大學 === 昆蟲學系 === 85 === English summary The developmental time of nymph of the green
peach aphid (Myzus persicae(Sulzer) ) on raddish has no
significant difference among different photoperiodsof 6L:18D、8
L:16D、10L:14D、12L:12D、14L:10D、16L:8D and 18L:6D,no matter
the temperatures are at 10℃、15℃、20℃or 25℃. However,
thereare significant differences among various temperatures, the
developmental time of nymph is the longest at 10℃and the
shortest at 25℃. The percentage of alate formed is the
highest at 15℃, and next at 10℃, undervarious photoperiods
after the aphids singly reared for 5 successive generations.
However, there is no any alatae emerged at 20℃and 25℃. The
percentage ofalate formed is the highest at the photoperiod of
10L:14D at both 10℃and15℃.The percentage of alatae formed
reached the highest of 3.81﹪in the thirdgeneration at 10L:14D
when the aphids singly reared successively at 10℃.However, at
15℃, the percentage of alatae increased with the increasing
ofsuccessive rearing generations, and reached to the highest of
7.62﹪in the5th generation. In comparison of the green peach
aphids reared on two different host plantsat temperature 15℃and
photoperiod 10L:14D, the percentage of alatae formedon raddish
sprouts showed higher than that on cabbage leaves.When the
nymphssingly reared on raddish sprouts after their mother adults
were crowding reared, the percentage of alate formed was higher
at 6L:18D and 10:14D than thatat 14L:10D and 18L:6D either at
10℃or at 15℃. When the aphid nymphs reared under the
density of 1 nymph/leaf after theirmother adults singly reared
on cabbages, there is no any alate formed at
varioustemperatures. However, when nymphs reared at the
densities of 10 nymph /leafand 20 nymph/leaf , the alate formed
in all of the various temperatures tested,and the highest
percentage of alate was 22.5﹪and 27.5﹪, respectively atthese
two densities under 10L:14D at 15℃. The percentage of alate
formedapparently was higher when the nymphs singly reared after
their mother aphidsreared under crowding of 10 adult/leaf than
their mothers under singly reared,furthermore in this case, the
nymphs were also reared at crowding densitiesinstead of singly
reared, the percentage of alate was significantly
furtherincreased. When the nymphs were reared at the density of
20 nymph/leaf aftertheir mother aphids crowding reared, the
percentage of alate formed was higherabout 7 time at 15℃than
their mothers singly reared, and those about 5 timeshigher at
10℃.In conclusion of the studies of the factors effect on the
formationof alates in related to the various temperatures,
photoperiods and aphid densities,the higest percentage of alate
formed appeared in the conditions of 15℃,6L:18D, after mother
aphids crowded for 5 days and at the density of 20 nymph/leaf.
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