This paper describes an improved approach to detecting farnesoic acid and juvenile hormone. A starting point for a large-scale in vivo RNAi screen perhaps? Open access paper.
Rivera-Perez C, Nouzova M, Noriega FG. A quantitative assay for the juvenile hormones and their precursors using fluorescent tags. PLoS One. 2012;7(8):e43784. PubMed PMID: 22928033