Two of these wonderful little beasties (tomato hornworms) were found on the tomato plants on August 5th, 2013. Last year they made an appearance on July 18th, and the year before in 2010, on August 4th.
Not the most reliable but we have been looking for them for a couple of weeks now.
Found another in a seperate bed on Aug 6th, with evidence of at least two others, but they were hiding too well.