Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2011.1090.1099Plutella xylostella (L.) (Lep: Plutellidae) and Its Solitary Endoparasitoid, Cotesia vestalis (haliday) (Hym. Braconidae) under Laboratory Conditions]]>AlizadehM. RassoulianG. R.KarimzadehJ. NavehV. Hosseini- FarazmandH. 1220111424Plutella xylostella (L.) (Lep: Plutellidae), is a destructive
pest of brassicaceous crops in the world. Cotesia vestalis (Haliday)
is one of most important biological control agents of P. xylostella in
the world and Iran. Both of P. xylostella and C. vestalis
biology were carried out in laboratory condition. Results showed that development
time of immature stages of P. xylostella including egg, Instar I, Instar
II, Instar III, Instar IV, prepupa, pupa were 2.39±0.17, 2.18±0.17,
2.06±0.28, 2.14±0.14,2.54±0.12, 0.40±0.12 and 4.23±0.23
days, respectively. Longevity of female and male were 28.26±0.05 and
30.22±0.05 days. By dissecting the parasitized larvae, the egg incubation
period of C. vestalis was recorded 1.73±0.06 days. In long-term
oviposition trials, females laid eggs on P. xylostella larvae for up
to 10 days. Larval development of the parasitoid in host only required 6.47
days: the first instar larva required 3.25±0.047 days; the second instar
larva needed 2.78±0.1 days and the third instar larvae exited the host
and pupated in, 0.4±0.07 days. Prepupal and pupal period of wasp were
1.9±.0.06 and 2.13±0.09 day, respectively. Unmated female and
male longevity of wasp were 16.83±0.37, 16.25±0.17 and sex ratio
is male-biased. When a mixed group and isolated of instars were presented for
parasitoid, the 2nd and 3rd instar larvae were so preferred and the 4th instar
was less attractive for selection. In choice experiment, the percentage parasitism
of 2nd, 3rd and 4th instars was 78.58, 69.94 and 4.36%, respectively. The rapid
oviposition rate, short life duration and high percentage parasitism increases
parasitoid potential for suppression of host population. Present results suggest
that C. vestalis has considerable potential as a biological control agent
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