Identifikasi komponen kimia kulit dan kayu pohon sengon yang dimakan larva Xystrocera festiva thoms. (cerambycidae, coleoptera)
Abstract
Xystrocera festiva Thoms. (famili Cerambycidae, ordo Coleoptera) classified as the most harmful pest in Sengon (Paraserianthes falcataria) plantations in Indonesia. The larvae of the pest eat the inner bark and sapwood of the sengon trees since the trees are 3 years of age. However the chemical compound(s) of the inner bark and sapwood digested are still unknown. It is necessary to identify parts of the tree eaten by the larvae sengon X. festiva. Identification of the chemical compound(s) digested was conducted by analyzing the chemical components of wood in Wood Chemistry Laboratory Department of Forest Products, Faculty of Forestry IPB, Laboratory of Chemistry Faculty of the Mathematic and Natural Science and Laboratory of the Nutrition Feed and Technology, Faculty of Animal Husbandry. Materials for the identification were collected from the private sengon plantation at Jasinga, Bogor. The material used for the analysis were the excrement on the bark surface and inside the bark, uneaten sapwood (outher bark), uneaten bark and healthy bark. The result of identification saw that the larvae eat cellulose, hemicelluloses, protein and starch contained in the inner bark and sapwood. The excrement on the bark surface was likely not eaten, just ejectied from inside of the bark. There were still hemicelluloses, cellulose, protein and starch in the larval frass (excrement inside the bark). The excrement inside the bark still stuck in a tree bark containing cellulose, starch, hemicellulose and protein, and the outer skin can not be eaten. This means that the materials that not everything can be digested by the larvae of X. festiva. If the comparison between the chemical constituents of the inner bark and sapwood before eating and after eating hemicellulose is the most digestible (91.06%) followed by cellulose (76.75%). Proteins are the most easily digested by the larvae of X. festiva (85.16%) compared with digestible starch (93.01%). From the chemical analysis of wood indicates that larval food X. festiva is important is hemicelluloses and cellulose. In the larval gut, cellulose must be digested by the enzyme cellulase but in this identification the present of cellulase in the gut was not analyzed. It was a possibility that the larvae produced enzyme or there is simbiosis of the larva and microorganism, just like Neotermes tectonae with some species of protozoa.
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- UT - Silviculture [1361]