UAS regulatory sequences drive expression of a single polycistronic tRNA-gRNA cassette that encodes three sgRNAs, each targeting a different gene. The sgRNAs target Mal-A1 (gRNA: AACTGCATCTATACGGAATCCGG), Amy-p (gRNA: TCTACAACATGGTGGCCTTCCGG) and Amy-d (gRNA: TCTACAACATGGTGGCCTTCCGG).