Bacteria

Bacterial spots and Blights• The most common types of bacterial symptom on plants are

those that appear as spots of various sizes on leaves, stems and fruits.

• Bacterial spots appear as necrotic, usually circular or roughly circular and in some cases they are surrounded by a yellowish halo.

• In dicotyledonous plants the development of some bacterial spots is restricted by intermediate or large veins and the spots appear typically angulareg.Angularleafspotofcotton

• Bacterial spots on leaves and stems of monocotyledonous plants appear as streaks or strips.LEAFSTREAKOFPADDY

• In leaf blight disease, the spots enlarge in size, rapidly necrotic, and through coalescence of several small spots, may produce large dead areas of various shapes.

• Eg: Bacterial leaf spot of Tomato caused by Xanthomonas campestris pv. vesicatoria

• Bacterial leaf blight of rice caused by Xanthomonas campestris pv. oryzae

Bacterial leaf Streak•Long, narrow necrotic lesions on leaves or stems

•Translucent streaks are formed on the veins

•Band like exudates

2.Angular leaf spot

Bacterial ooze

Exudates, consisting of bacterial cells, on the surface of plant parts infected with bacteria

Bacterial ooze

Exudates, consisting of bacterial cells, on the surface of plant parts infected with bacteria

BACTERIAL BLIGHT

Bacterial Blights

BACTERIAL LEAF STREAK

5.Boll rot.

Oil soaked lesions

STEM INFECTIONVEINAL BLIGHT

Soft rot in Carrot

Soft rot in Potato

Scab

Galls

Bacterial Wilts

Canker

CANKER

Fire Blight of Apple

Fire Blight of Apple

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