Under sunlight, approximately 70 mating
pairs were recorded daily (Figure 1). Mating
began at 08:30 and peaked at 10:00 with an
average of 23 mating pairs at a light intensity
of approximately 110 μmol m-2s-1. Eightyfive
percent of the mating activity occurred
during the morning. Mating activity decreased
when the light intensity was more than 110
μmol m-2s-1. On average, two mating pairs
were observed at 13:00 when light intensitywas 200 μmol m-2s-1.
Mating activity was not observed when using
the rare-earth light. Under the quartz-iodine
lamp, approximately 40 mating pairs were
observed per day. This value was
approximately 39% less than observed when
observing the effects of sunlight (Figure 1).
The eggs collected from the sunlight and
quartz-iodine lamp treatments were reared in
the insectarium. There were no significant
differences in the larval and pupal
development times of the eggs collected from
the two light sources (Table 1).
Mating and oviposition of the second and
third cohorts were observed under the quartziodine
lamp. Eggs collected from the second
and third cohorts under the quartz-iodine lamp
treatment hatched, pupated, and emerged. Thelarval and pupal development times were not
significantly different among the three cohorts
under the quartz-iodine lamp (P>0.05) (Table
2).
Oviposition peaked on the 17th day when
using sunlight (Figure 2). Under the quartziodine
lamp treatment, a similar peak
appeared on the 13th day and lasted for 6 d
with the highest level of egg production being
approximately 61.9% of that observed in the
sunlight treatment. There was no significant
difference (P>0.05) in the number of egg
masses laid between the sunlight and the
quartz-iodine lamp treatments (Figure 2).
The amount of egg-filled flutes collected under the sunlight and the quartz-iodine lamp treatments in a cage during
a 25 day period. The experiment was replicated three times. High quality figures are available online.