Clap's Favorite ripens in mid Aug. The flavor, at least to me, tasted like a Bartlett pear. I grew a dwarf plant and I liked the fruit very much, in fact I am considering getting a plant; I had to leave mine behind when I moved.

My little Red Clapp's took a couple of Colorado winters just fine. I hear they are Fireblight susceptible, so that would be my only concern.

I looked up Clapp's Favorite and found a very interesting article on it's creator:

Here is a link that might be useful: He Who Hybridized the Clapp's Favorite Pear

When is Fireblight most likely to occur, and what is the best prevention? thanks..

Well, my personal opinion of it is that Mr. Clapp couldn't have had many pear trees to choose from if he chose this as his favorite.

My results with it have been pretty poor. Most years, the pears are gritty and relatively bland to very bland. A few years, they've been decent to good. I've got it growing in what should be an excellent site, and nearby trees have fine quality fruit, so I can only conclude its a variety issue.

The tree is easy to grow. It is probably one of those varieties that is adapted to a specific climate in terms of heat and moisture, and the results in terms of fruit quality vary widely if its not happy.