I noticed a couple flowers on my chojuro and 20th century pear were starting to brown at the blossom end, moving up the pedicel. Is this how fire blight starts or is this sign of unsuccessful pollination? I plan to keep an eye on it to see if it spreads.

I did spray with copper just around green cluster and during bloom, before a rain event.

Sorry for the lousy photos. My phone camera has a fixed focal point.

Chojuro. Affected flowers are at picture center.

20th Century. Affected flowers just starting to turn brown. Pedicels not yet browning.