orally delivered double‐stranded RNA (dsRNA). RNAi in WCR is systemic and spreads
throughout the insect body. This raises the question whether transitive RNAi is a mechanism
that functions in WCR to amplify the RNAi response via production of secondary siRNA.
Secondary siRNA production is achieved through RNA‐dependent RNA polymerase
(RdRP) activity in other eukaryotic organisms, but RdRP has not been identified in WCR and …