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A spokesman for the Punjab agriculture department said here on Wednesday that cotton BT varieties include FH-142, IUB-13, MNH-988, CIM-600, IM-598, AGC-999, AGC-777, MNH886, VH305, VH259, Nayyab 878, Sitara 11, BH-178, CIM 602, FH LALAZAR, FH114 and UGC-09. He said that growers must sow non-BT varieties on at least 10 per cent of land along with BT varieties so that worms might not develop resistance against BT varieties.