Bio-warfare In Middle-earth

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Originally Posted by Inziladun

Why didn't Sauron attempt to set another plague on the West after his return to Mordor?

Good question. It may have been simply ROI - return on investment. We don't know what it took for Sauron to cook these things up. He may have thought that, with the poisoning of Denethor's mind and the alliance with Saruman the traitor that there was no need to send another plague. He may also have been 'employing' more human types, and so his losses may have been greater than in the past. Think about the new creatures that didn't blanche at the sunlight.

And take it from me, you can only spend so much time in the lab.