Reduce the spread of fire blight by removing and destroying all infected plant parts. Pruning cuts should be made 12 to18 inches below any sign of infected tissue. Disinfect all pruning tools between cuts using a solution of 1 part household bleach to 9 parts water. Succulent new growth is easily infected, if injured. Avoid excess nitrogen fertilization which results in excess succulent growth.
Bacteria enter the plant through blossoms, fresh wounds or natural openings.
The disease is spread by rain and insects attracted to the bacterial ooze, such as bees, ants, flies, aphids and beetles. These insects inadvertently carry the bacteria to opening blossoms. Control of insects can reduce the spread of bacteria and the occurrence of infections. During bloom, bees can carry the fire blight bacteria during pollination. Do not use insecticides during bloom.