Journal of Oil Palm Research Vol.   p.  
DOI: https://doi.org/10.21894/jopr.2020.0090

ECONOMIC INJURY LEVEL OF OIL PALM BUNCH MOTH, Tirathaba mundella WALKER FOR PEST MANAGEMENT RECOMMENDATIONS IN OIL PALM PRODUCTION

Author(s): SU CHONG MING*; PATRICIA KING JIE HUNG*; KWAN YEE MING*; ZAKRY FITRI AB AZIZ* and ONG KIAN HUAT*

Oil palm bunch moth, Tirathaba mundella Walker is a notorious bunch feeding pest typically among oil
palm aged three 3-7 year-old planted on peat. In order to manage the pest, an economic injury level (EIL)
for the pest needs to be determined which could assist in decision making if a control tactic is justified.
In order to determine the EIL, the percentage of fertile oil palm fruitlets and oil to bunch content were
determined for fruit bunches with different pest infestation severity. The severity was characterised based on
the mean larvae present in fruit bunches and male inflorescences. The study found that the mean larvae count
was positively correlated with the economic losses and number of parthenocarpic fruitlets. The overall oil
extraction rate (OER) of moderate and severely infested fruit bunches was significantly reduced as compared
to clean fruit bunches. Based on average crude palm oil (CPO) market price and production per hectare, an
EIL for Tirathaba mundella (T. mundella) was able to be estimated. This study suggested the EIL at 10%
of oil palms per hectare moderately or severely infested. The finding of this study would benefit future pest
management practice in oil palm plantation established on peatland.

Keywords: , , , ,

Author Information
Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia, Bintulu Sarawak Campus, P.O. Box 396, Nyabau Road, 97008 Bintulu, Sarawak, Malaysia.
E-mail: patricia@upm.edu.my


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