The research was carried out on a seven years old oil palm plantation located in Selangkun Estate, Kotawaringin Barat, Central Kalimantan, Indonesia. This research was carried out to find out the factors that influence the population to E. kamerunicus on pollination efficiency (fruit set value) in clay soil, sandy soil and shallow organic soil type. The research was done by sampling method of E. kamerunicus population on anthesis male flower, anthesis male flower availability, climate parameter, natural enemies and pollination efficiency in three different soil types with size of 5 ha each. The highest population of E. kamerunicus on male flower was found in clay soil type (50,811 weevils/ha) followed by sandy soil type (12,064 weevils/ha) and shallow organic (11,343 weevils/ha). The population of E. kamerunicus was significantly correlated with availability of male flowers per ha. Availability of male flowers on the average in clay soil type was 4.9 flowers/ha and it was significantly different with sandy soil (3.2 flowers/ha), but it was not significantly different with shallow organic (3.9 flowers/ha). Climatic parameters and natural enemies have no significant correlation with population of E. kamerunicus. Fruit set value on clay soil was 58.9% and it was significantly different with sandy soil which was 49.8% and shallow organic which was 46.4%. The population of E. kamerunicus will increase as the increasing availability of anthesis male flowers that will ultimately increase the value of the fruit set in each soil types.
