The Biology of Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae) on Sago Cuttings (Metroxylon sagu Rottb.) in Maluku Forest of Sago, Indonesia

Rein Estefanus Senewe, Hermanu Triwidodo, Pudjianto Pudjianto, Aunu Rauf


Sago (Metroxylon sagu Rottb.) is the most popular crop in Maluku because of its role as the staple food supply for both, local communities and people in general. Sago cutting (a cutted sago trunk) is an important part in the processing of starch production. This study aimed to assess the biology of Rhynchophorus ferrugineus Olivier on sago cutting forest of Maluku. The study was conducted in the Rutong village, Maluku, from June to October 2016. Five felled mature sago trees were cutted with the length of 20 cm for each trunk. The occurance of insects was observed on sago cutting 7 DAC (days after cutting) by splitting and unload the cuttings. Our study showed that a sago cutting is a host for R. ferrugineus insect development. The average number of R. ferrugineus development phase were found: in the larvae phase between 14-119 DAC, pupae between 70-112 DAC, and imagos between 77-112 DAC, while 45 eggs were only once found on the outer skin of the sago cutting. Weekly observations showed, the larvae of R. ferrugineus experienced 4 times molts in 5 instar periods. There were an average of 586 first-instar larvae, 75.2 second-instar larvae, 51.6 third-instar larvae, 26 fourth-instar larvae, 58.6 fifth-instar larvae, 7.1 cocoon/pupae and 14.2 adults/imagos found in a period 14-119 DAC. The incubation periods of the eggs were 7 days; larvae were 56 days; cocoon/pupae took 7 days before going to the adult stage. The life cycle duration of R. ferrugineus from an egg to imago was 77 days.


life cycle; Rhynchoporus feerugineus; Coleoptera; Curculionidae; larvae; sago cutting.


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