Disease

Symptoms

Fungicide

Method of application/ Control Measures

Name:-

Bacterial Speck

Source: - Infected seed, transplants, tomato crop residue, several weed hosts.

Name:-

Bacterial spot

Infected seed, transplants, tomato crop residue, several weed hosts.

Favoring Conditions Both: Splashing rain sprinklers.
Speck: favored by cool conditions.
Overall Plant: -. Plant stunting and reduced yields if young plants are severely infected.

Leaf: -. small black specks, some with yellow halos. Specks coalesce, black ragged leaf margins.

Stem: - superficial black raised specks with yellowish ring or halo. Later scabby, with darker halos. Hard to peel

Root and fruit: - causes round water soaked spots, which gradually become yellowish brown and finally blackish brown with sunken ashy centre and pale yellowish green halo. Later, the spots become irregular to circular, measuring 1.0mm in diameter.

Overall symptoms are similar to bacterial speck. Spot: favored by warmer conditions.

Leaf: -. Severe spotting may cause distortion and death of leaflets.

Stem: - on the stem and petiole the lesions are large, black and canker like.

Root and fruit: - lesions on unripe green fruits become corky and resemble small scab with irregular margins.

Mercuric chloride (1:1000 )

Agrimycin-100 (100 ppm)

Same as bacterial speck.

Seed Treatment at 50 degree C for 25 min

Spraying at 10 days interval

Resistant varieties. Hot water treatment of seeds at 50 degree C for 25 minutes is effective in killing the bacterium.

Same as bacterial speck.