STUDY ON THE ABIOTIC FACTORS INFLUENCING THE POPULATION DYNAMICS OF THE BAGWORM, Metisa plana WALKER (LEPIDOPTERA: PSYCHIDAE), IN AN OIL PALM PLANTATION IN PERAK, MALAYSIA

Nur Robaatul Adhawiyah Mohd Ali Napiah, Noorhazwani Kamarudin, Shamsilawani Ahmad Bakeri, Nurhafizhoh Zainuddin, Mohamed Mazmira Mohd Masri

Abstract


Bagworm infestation can significantly impact oil palm production leading to crop losses up to 40%.This is especially critical among smallholders where management measures are usually delayed. Gaining insight into the influence of environmental variables on bagworms can aid in developing a more effective pest control approach. This study examined the impact of abiotic conditions: temperature, humidity, and rainfall on bagworm population in selected oil palm plantations in Perak, Malaysia. A study on interaction between bagworm Metisa plana populations with abiotic conditions was carried out at a smallholder oil palm plantation in Perak at regular intervals of 1-2 weeks per month during a span of 3 years (2018-2019 and 2021) using anemometer. Whilist the rainfall data was obtained from the Meteorological station. Change in temperature had a weak positive correlation (r=0.0024) on bagworm population during the early stages (larvae 1 to larvae 3), a moderate positive correlation (r=0.184) during the late stages (larvae 4 to pupae), and a slight positive correlation (r=0.061) with population of bagworm. Rainfall shows a positive correlation with Metisa plana populations, whereas relative humidity exhibits a negative correlation across all stages and populations of bagworms. The data indicated that variations in temperature and rainfall potentially influence bagworm populations. However, a comprehensive understanding of this impact necessitates with advanced Integrated Pest Management (IPM) approaches, pest monitoring and the utilisation of modelling tools as mitigation strategies.


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