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Study of Diets Efficiency on Biological Parameters of
Chrysoperla carnea
for Mass Rearing
5
Figure 2 Mean weight of immature stages of
C. carnea
Note: Different letters indicate significant differences at level of 0.01
Figure 3 Mean of pre-oviposition period of
C. carnea
adults on
different diets
Note: Different letters indicate significant differences at level
of 0.01
to the artificial diet. The peak of oviposition observed
during 10-15 days and the end of it was at 19-22 days
(Figure 4).
2.5 Fecundity and fertility
The lowest and highest average number of eggs
(150.5±4.02 no.) and (470.25±9.8 no.) (eggs/female)
were laid by females fed on artificial and semi
artificial diets, respectively (Figure 5). Also the
fertility of eggs showed significant differences
(
p
<0.01) between different diets. The lowest fertility
(offspring/female) was observed in females, which
were fed on artificial diet (Figure 5).
2.6 Sex ratio
The sex ratio of new generation adults were 13:12,
Figure 4 Fluctuation of oviposition rate of
C. carnea
adults on
different diets
Figure 5 Mean fecundity and fertility rates of females
C.
carnea
Note: Different letters indicate significant differences at level of 0.01
14:11 and 12:13 (female: male) on flour moth eggs,
semi artificial diet and artificial diet respectively. It
showed no significant difference between kinds of
food and amounts of sex ratio (close to 50%:50%)
(Table 3).
3 Discussion
3.1 The developmental times
The essential factor for suitable growth and
development of
C. carnea
is the type and amount of
predator larval feeding (Zheng et al., 1993b; Obrycki
et al., 1989). Hence in this research the mean total
larval and pupal periods of lacewing observed on semi
artificial diet is the best choice for a good growth of
adults and their predatory potential. Our results are
very close to Ulhaq et al., (2006) work which reported
total larval and pupal periods on artificial diet (hen’s
Molecular Entomology