University of Florida

Bacterial Spot

Bacterium

Xanthomonas campestris pv. vesicatoria

Infects

Foliar plant parts and fruit.

Symptoms

Foliar lesions are small (1/8 in) and dark brown, fruit spots are 1/8 in - 1/4 in. in diameter, raised, with a ruptured epidermis.

Pathogen Spread

Bacterium can be seedborne, transplant-borne or spread from volunteer tomatoes or crop debris by wind-driven rain into stomates of foliage or wounds or insect punctures or fruit. It can also be spread mechanically.

Favorable Conditions

Wet, windy weather with relatively high temperatures of about 80-89 F. Can be very severe in late summer, early fall.

Bacterial Spot Pictures

bacterial spot leaf damage
Image # 118.
Bacterial Spot
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small brown, round to angular leaf lesions, with a chlorotic ring.

bacterial spot on fruit
Image # 118.
Bacterial spot - fruit spots are 1/8 - 1/4 in. diameter and are raised with a characteristic ruptured epidermis (courtesy W. M. Stall).