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In oil palm plantations, there is age gradient that is expected to affect pattern of Hymenopteran parasitoid community. The aim of the research is to evaluate effects of age gradient of oil palm plantations on community of hymenopteran parasitoid. Approximately, six blocks representing three different ages of oil palm plantations (<3 years, 6 years old, and 18 years old) were selected for parasitoid sampling. For each selected block, about five hectares were systematically selected. Samplings were conducted by surveying hymenopteran parasitoid inside the plantation in one ha for one hour transect walk. Insect collections were conducted using yellow pan trap and sweep-net along 30 days. Collected insects stored inside plastic container containing alcohol 70% and brough into laboratory for sorting and identification. Overall, we sampled approximately 2440 specimens of Hymenopteran parasitoids belonging to 9 superfamilies, 14 families and 143 morphospecies. Braconidae, Scelionidae, and Ichneumonidae were the most abundant and specious families. Age gradient has a strong effect on species richness and species composition of hymenopteran parasitoid. Younger oil palm plantations support more species number and more similar species composition than older oil palm plantations. Sampling methods did not substantially affect community pattern of hymenopteran parasitoids.

Pattern of Hymenopteran Parasitoid Community in Oil Palm Plantations: Effects of Age Gradient or Sampling Methods?