ICAR-DMR lists wheat straw, paddy straw, sorghum, pearl millet and maize stalks and sugarcane bagasse as milky substrates. Cereal straw is what most growers use.
Condition matters more than choice. DMR is blunt: the material must be new, dry and not soaked by rain. Straw stacked through a monsoon already carries moulds, and pasteurisation kills only what it reaches.

