For everyone who are not familiar with Oryctes sp. – an insect pest known to cause damages to coconut and oil palm plantations in Indonesia, here is a bit of information for you. The adult of Oryctes sp., also known as “Kumbang Badak” (Indonesian) is one causing damages to the coconut or oil palm trees.
More over, the adults of Oryctes sp. did not lay their eggs in the alive coconut or oil palm trees. Instead, they will lay their eggs into dead coconut or oil palm trees. Once the eggs hatched, the larvae of Oryctes sp. will feed on rotten tissues of a dead coconut or oil palm trunks. Therefore, removing dead coconut or oil palm trees are necessary and required as part of control strategies for this insect.
Have you ever wonder how many larvae growing in a dead coconut trees? If you have asked such question before, here are the answer for that.
To satisfy our curiosity, we select one coconut tree that has been dead a year ago. Subsequently we cut down the top one meter part of the dead tree and opening it up to find the Oryctes larvae possibly living in it. Once finding them, counting the frequency of the larvae and grouping them according to their size were done
Here are slides of some pictures we took from the observation of the dead trunk of coconut tree in Pati, Central Java, Indonesia.
The results were quite shocking. We found a total of 98 larvae of Oryctes sp. growing in the top one meter of the dead trees. Moreover, the larvae were at least in four different sizes. Such data indicating that they are most probably coming from at least four generation of eggs.
Let assume that one adult Oryctes sp. can grow from each of the larvae and one adult insect can potentially cause a serious damage to one coconut tree. Therefore, from those one meter of dead coconut tree can potentially emerge 98 adult insects that can cause substantial damage to 98 coconut trees in the areas.
If this case is true, no wonder there are so much damage to Kopyor coconut provenances in Pati and other places in the regions because of this insect. This scenario is a nightmare for one who have to develop control strategies for this insects.
It is very common that the Kopyor coconut owners usually did not immediately cut down their dead coconut trees after being damaged by Oryctes sp. Based on this simple observation, it is necessary to inform Kopyor coconut owner to cut down the dead trees as soon as possible and never let them standing rotten in the field. Otherwise, such dead tree will become breeding ground for Oryctes sp. and the place for them to lay eggs for the next generations of pests.