The present invention describes a new non-compound based approach for insect and/or arachnid control. The present inventors have identified for the first time novel targets for RNAi, which can effectively control insect and/or arachnid pest populations. Accordingly, the invention provides both nucleotide and amino acid sequences for the novel targets. Also provided are RNA constructs including double stranded RNA regions for mediating RNAi in insects, DNA constructs, expression vectors, host cells and compositions for controlling insects and/or arachnids using RNAi. Finally, the invention also provides for the use of the constructs, vectors, host cells and compositions in control of insects and/or arachnids populations and suitable kits for use in an RNAi based method of controlling insect and/or arachnid pests.