Abstract: The peach fruit fly, Bactrocera zonata (Saunders) (Diptera: Tephritidae), is a serious pest attacking
a wide range of fruits in Egypt. The toxicity, biology and biochemical effects of certain insecticides belonging
to different chemical groups Beticol, Biosad, Elsan, Lufox, Mani, Match and Radiant against full grown larvae
and pupae of B. zonata with different concentrations as contact poisons or in sandy soil treatments were
assayed under laboratory conditions. The results showed that Radiant was the most contact poison on full
grown larvae among the tested insecticides, followed by Elsan, Beticol, Lufox, Match, Biosad and Mani. The
respective LC values were 4.65, 18.8, 20, 35.5, 122, 158 and 330ppm, respectively. On 1-day old pupae, Elsan
50
was the most potent toxicant compound followed by Match, Lufox, Beticol, Radiant, Mani and Biosad. While,
in sandy soil treatments, Lufox was the most potent toxicant against 1-day old pupae at (LC 200ppm).
Considerable number of larvae, pupae and adults showed obvious malformations after treatments as surface
contact or in sandy soil. Also, certain biological aspects of adults emerged from pupae treated with LC values
of the tested insecticides as surface contact application was detected. The obtained results show that preoviposition,
oviposition
and
post-oviposition
periods
were
highly
significantly
different.
The
tested
insecticides
reduced
the
fecundity
and
hatchability
percentage.
Also,
these
insecticides
caused
high
levels
of
sterility
for
adult
females
emerged
from
treated
pupae.
So,
it
can
be
used
as
chemosterilizing
agents
against
B.
zonata.
Also, Biosad, Radiant, Beticol, Lufox and Mani decreased adults longevity and induced significant
differences in enzymes and total proteins appeared after treatment with the tested insecticides compared with
control. |
