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Current Category » Crop Disease and Management

Important Phytopathogenic Bacteria

Sr.No

Genus

Family

Gram Reaction

Characters

Symptoms produced on host

Example

1

Pseudomonas

Pseudomona deveae

-Ve

1. Rod straight to curved, size 0.5-1 X 1.5-4 mue m, one to many polar flagella.2.Colonies not yellow, do not produce acid from lactose.

Leaf spot, blights, vascular wilts, soft rots, canker.

1. Brown rot or bacterial wilt of potato.2 Bacterial wilt of brinjal and tomato.

2

Xanthomonas

Pseudomona deveae

-Ve

1. Straight rods, size 0.4-1X 1.2 -3m. One polar flagellum present.2. Colonies yellow due to Xanthomonadin, produce acid from lactose.

Leafspot, fruit spots, blight, canker

1. Citrus canker, 2. Black arm of cotton,3.Blight of paddy.

3

Agrobacterium

Rhizobiaceae

-Ve

1. Rod shaped, size 0.8 X 1.5 -3 mue m. 1 to 4 peritrichous flagella.2. Colonies mostly white do not hydrolyze starch.

Crown Gall

Crown Gall of stone fruit roses.

4

Erwinia

Enterobacteriaceae

-Ve

1. Straight rods, size 0.5-1, 0-3.0 mue m , several peritrichous flagella.

Fire blight, wilt soft rot.

1. Fire blight of apple.2. Soft rot of vegetables.

5

Clavibactor (Corynebacterium)

Enterobacteriaceae

+Ve

Straight to straightly curved rods, 0.5-0.9X 1.5 -4.0Mue m. non motile but some species are motile by one or two polar flagella.

Wilt

Wilt of potato ad Tomato

6

Streptomyces

Streptomycetaceae

+Ve

Slender branched hyphae without cross walls 0.5-2 mue m diameter.

Scab

Potato scab

Current Category » Crop Disease and Management