  We address the properties of defect solitons (DSs) in defective parity-time
potentials with real part of dual-frequency lattices. The impact of defect on
stability regions of DSs was considered. For positive defects, DSs whose
real/imaginary parts are symmetric/antisymmetric (SA) functions of position are
always stable in the semi-infinite gap and nonexistent in the first gap. While
for negative defects, in semi-infinite gap, the SADSs are stable in most of
their existence region besides low power region, but in the first gap, all the
SADSs are stable. The ASDSs are unstable in the whole semi-infinite gap
regardless of defects, but can be stable in the low power region for positive
defects.
