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Red palm weevil [ Rhynchophorus ferrugineus  (Olivier)], is native to South Asia and expanding its distribution range globally. Recent invasions of red palm weevil around the world, including Saudi Arabia, has become a global constraint for the production of palm species. Although, several control measures have been tested, none of them seemed successful against this invasive species. Therefore, we focused on silencing the reproduction control gene  vitellogenin (Vg)  based on RNA interference (RNAi) strategy for its possible application in the management of  R. ferrugineus . The  Vg  is a major yolk protein precursor critical for oogenesis. To do this, fat body transcriptome of  R. ferrugineus  female adults was sequenced, which provided partial  Vg  gene transcript (FPKM 5731.60). A complete  RfVg  gene transcript of 5504 bp encoding 1787 amino acids was then sequenced using RCAE-PCR strategy and characterized. Phylogenetic analysis suggested that  RfVg  has closer ancestry to the coleopteran insects. The  RfVg -based RNAi significantly suppressed the expressions of  Vg  gene. The 15, 20 and 25 days post-injection periods suppressed  Vg  expressions by 95, 96.6 and 99%, respectively. The suppressed  Vg  expressions resulted in the dramatic failure of  Vg  protein expression, which caused atrophied ovaries or no oogenesis and ultimately eggs were not hatched. These results suggest that knockdown of  Vg  gene involved in  R. ferrugineus  reproduction is a promising target for RNAi-based management of  R. ferrugineus .

Silencing of vitellogenin gene contributes to the promise of controlling red palm weevil, Rhynchophorus ferrugineus (Olivier)