First of all, make sure your Askimet settings are set to automatically spam/delete comments on posts older than 30 days. I've found that this eliminates most bots.
It that doesn't work, here's a quick tuturial for turning off comments on individual blogs posts.
Get started:
Go to the post in question, click "edit."
Step one:
Go to screen options at the very top and follow these instructions:
https://skitch.com/mclanecreative/8nmk6/edit-post-love-is-an-orientation-wordpress
Step two:
Scroll down to the bottom until you see this:
https://skitch.com/mclanecreative/8nmmj/edit-post-love-is-an-orientation-wordpress
Step three:
Scroll back to the top and click "update to save your changes:
https://skitch.com/mclanecreative/8nmmj/edit-post-love-is-an-orientation-wordpress
Step four:
Find someone and give them a high five.
That's it!