RELATIONSHIP BETWEEN Metisa plana AND ITS PARASITOID (BRACONIDAE AND ICHNEUMONIDAE) AT DIFFERENT TIME-LAGS IN OIL PALM PLANTATION

Farrah Melissa Muharam

Abstract


Bagworm or Metisa plana, is the most important leaf chewing pest in the oil palm cultivation, while parasitoids such as Braconidae and Ichneumonidae are the common main natural enemies for bagworm. While the relationship between natural enemies with its insect pest has been broadly investigated, little is dedicated for assessing the delayed effects of the bagworm population on parasitoids. This study was performed to determine the relationship between and its common parasitoids (Braconidae and Ichneumonidae) at different time-lags under field condition. Bagworm censuses for instar stages first (L1) to seven (L7) were conducted biweekly in an oil palm plantation belongs to TH Plantation Berhad in Muadzam Shah, Pahang from July 2016 to June 2017, along with bagworm’s parasitoid namely Braconidae and Ichneumonidae. The results revealed that Braconidae presence was associated positively with bagworm at week 6 to 12, whereby the associations were stronger for late instar stages. On the other hand, Ichneumonidae presence was positively related to middle instar stages at early time-lags i.e. week 2 to 6. In other words, Ichneumonidae population is expected to increase after 2 to 6 weeks given increasing population of bagworm while Braconidae population is likely to rise after 6 to 12 weeks of the increasing population of bagworm.


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