Shoot, I play super annihilator all the time and just don't believe there is a prerequisite research....its in the green category along with terraforming and farming.....usually a higher tech ability, right about the same requirements as invasion tactics. Once you research the tech, you obviously have to build the spore ship....my recommendation is to not use the standard ship, but upgrade it with some speed....faster spore is better spore. And don't bother with anything else....it is destroyed on use so guns and defense are a waste as is any kind of transport.