The invention relates to the control of fireblight (Erwinia amylovora) in plants by application of acylcyclohexadiones to plants susceptible to fireblight to reduce or prevent the infestation and disease caused by Erwinia amylovora. Specific compounds suitable for use in practicing the invention include prohexadione calcium and trinexapac ethyl. Included in the invention are compounds from the formula: ##STR1## and compounds of the formula ##STR2## and the metal or ammonium salts thereof.
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