BACTERIAL LEAF SPOTS Bacterial leaf spots can be caused by many bacteria and can affect many different plants.

	Symptoms: Small brown spots on foliage with a yellow halo. Bacterial spot on Pothos. Photo by Plant Disease Clinic
	Symptoms: Leaf margins may turn yellow and then die. Bacterial leaf spot on Diffenbachia. Photo by Plant Disease Clinic
	Symptoms: Large brown necrotic areas with yellow halos. Bacterial leaf spot on Dracaena. Photo by Plant Disease Clinic
	Symptoms: Large brown necrotic areas at leaf margins. Bacterial leaf spot on Ficus. Photo by Plant Disease Clinic
	Symptoms: In advanced infections, small lesions may coalesce. Bacterial leaf spot on Ivy. Photo by Plant Disease Clinic
	Bacterial leaf spot on Orchid. Photo by Plant Disease Clinic

General Information

Causal organism:	Variety of bacteria
Method of dispersal:	On air currents or water splashes
Infection point:	Leaves, through wounds or natrual openings

Control Measures

Control:	Avoid wetting leaves. Place plants in well-ventilated areas with low humidity and provide adequate space between plants. Provide plants with adequate light. Isolate diseased plants to prevent spread. Prune out affected leaves, if possible, dipping scissors or knife in 10% bleach solution after each cut.
Labeled fungicides:	Not recommended
Comments:	Bacterial leaf spots are fairly rare on houseplants since they require moisture for infection. Leaf spots may also be caused by direct sunlight burning shade-loving plants, cold water splashing on leaves, and old age.

Definitions & Disclaimer

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This page developed and maintained by Janna L. Beckerman, Ph.D. and Elizabeth Wiggins

Department of Plant Pathology
495 Borlaug Hall
1991 Upper Buford Circle
St. Paul, MN 55108
Comments? Email to janna@umn.edu