The Effective Application Time to Spray Bacillus Thuringiensis Subspecies Kurstaki for Managing Bagworm, Metisa Plana Walker on Oil Palm
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This study was conducted to determine the suitable time to
apply the Bacillus thuringiensis sub species kurstaki against the
larvae of the Metisa plana oil palm. The aim of this study is to
search for the most economical method for using the B.
thuringiensis sub species kurstaki. Owing to that matter, the
larvae was sprayed at three different times, 0800, 1200,
and1600, with 0.68ml of the B. thuringiensis sub species
kurstaki product Dipel ES®/200 ml of water, under fully netted,
rain sheltered conditions. Results showed the effectiveness of
the B. thuringiensis sub species kurstaki in the control of
bagworm, with more than 90% larvae mortality in three days
after treatment. However there are no significant different in
mortality rate and duration killing time for M. plana larvae on
these three application times.