Fireblight: Bacterial Disease of Rose-Family Plants

Fireblight affects only rose-family plants: apple, pear (including ornamental flowering pear), hawthorn, and pyracantha. The bacteria enter through blossoms, spread by pollinating insects and splashing water. Temperatures above 60°F (16°C) and high humidity favor the disease. Sudden shoot dieback or blackening as if scorched is a telltale sign.

Prevention and Management

Plant resistant varieties or avoid susceptible species. If infection appears, immediately cut out infected limbs at least 1 foot below the diseased area. Disinfect tools between cuts.

There is no chemical control for fireblight.