The application of neem seeds extract
did not affect larval developmental time after
treatment, either in feeding test or contact
test (Table 5). The DBM larval developmental
time ranged 5.6-6 days. This larval stage is
shorter than those recorded by Kalshoven
(1981), i.e. 7-11 days. This could be because
the laboratory temperature was 30±1°C,
which was higher than average temperature
at highland where the cabbages usually were
planted. At high temperature, life cycle of
DBM will be shorter (Rueda & Shelton, 1997