UnScramble this Word: i r t i o v s?

Questions

Which fungal plant disease particularly affects brassicas?

At the 1991 World championships in Tokyo, which British hurdler ran the last leg of the 4x400 relay to win gold for Britain?

Which detective was played by Robert Stack on TV and by Kevin Costner in a film?

Who is the original master of the Shakespearean jester Lancelot Gobbo?

Who is the master of the Shakespearean brute Caliban?