One is and one is not. @haldog is able to get it to bloom reliably in west central Georgia with 650-850 chill hours while @coolmantoole states that Ayers blooms unreliably in his area which gets between 500-600 chill hours, leading to his estimate that it needs roughly 600 chill hours.
From what I’ve read, the ones stating 300-400 are likely wrong, but I could be wrong too.
A reliable source to me can be defined as one that provides accurate, trustworthy, and unbiased information, supported by evidence and expertise. I consider many nurseries (especially re-sellers) to be biased towards selling product, and therefore unreliable. your opinion of a reliable source could certainly differ from mine.
We are debating it because I thought your answer of 300-400 chill hours seemed very incorrect, so I had to say something, and I found the evidence supporting those chill hours requirements you provided to be lacking.
I knew 300-400 chill hours is literally the answer google AI gives you if you google “how many chill hours for Ayers pear” so I couldn’t in good conscience let that stand alone as a fact in this forum where someone might use it as a point of reference.
If you had offered up chill hours of 500-600 I would have been less inclined to offer a rebuttal.
It sounds like you are defining “southern” as south of the Mason Dixon line, which, if that is the definition of a southern pear for you, then so be it. If this is your definition, I can acquiesce to this statement.
Unfortunately utilizing the generic definition of “south” to determine fruit tree cultivar suitability is reckless and ignores all the different climate factors of the various regions of the American “south”.
@coolmantoole defined southern pears here as “varieties that do well in the Southeastern United States and other hot and humid regions with lots of fire blight pressure and where chilling hours can be deficient" and as I read through southern pears thread, the conclusion I was left with was Ayers is not a southern pear based on that definition.
What is or isn’t a southern pear can certainly be a matter of opinion, and this is just my opinion based on what I have read.