Fire blight

Typical crook neck symptom of infected shoot.

Fire blight cankers on photinia.

Cankers on trunk often serve as overwintering sites for the pathogen.

Close-up of bacterial strands on fruit. These strands detach and drift with the wind.

Mummified fruit with strands of bacterial ooze.

Fruit with white, curling strands of bacteria.

Bacterial strands may form on blossoms and young fruit under humid conditions.

Diseased fruit.

The disease causes lack of leaf detachment on infected branches, commonly seen during California win

Typical appearance of advanced stage of disease after the bacterium invades from shoot tips/flowers