EFFECT OF BAGWORM Pteroma pendula Joannis ATTACK ON THE DECLINING OF OIL PALM PRODUCTIVITY

Hari Priwiratama, Tjut Ahmad Perdana Rozziansha, Agus Susanto, Agus Eko Prasetyo

Abstract


Outbreak of oil palm bagworm Pteroma pendula has been reported within the last few years in several plantations in North Sumatra. A study was conducted to determine the impact of P. pendula attacks on oil palm productivity. Aerial photograph was taken in November 2016 and analyzed to determine the level of damage on each plant canopy. The damage symptoms were classified onto mild (score 1), moderate (score 2), severe (score 3), and very severe (score 4) with healthy palms (score 0) used as control plants. The sample palms were randomly selected and observed for its sex ratio, bunch number and bunch weight at 18 months after defoliation. The attack of P. pendula at the highest level (score 4) caused a significant effect on sex ratio and the number of bunches produced. The fresh fruit bunches production was declined from 21,02% to 36,35% on palms with moderate to very severe attack (score 2-4). Similar palms also have a potential case of inflorescences abortion from 18,41% to 32,54%. However, the average bunch weight was not influenced by P. pendula attack.


Keywords


bunch number, bunch weight, Pteroma pendula, sex ratio

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DOI: http://dx.doi.org/10.23960/j.hptt.219%25p

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