TopDB

Disease

Bacterial speck:

Disease ID : ToPDB_DD002

Summary :

Introduction : Bacterial Speck disease is a serious bacterial Tomato crop disease . It is a very common disease in worldwide. Every year a big amount of crops loss occour due to this disease.

Pathogen cause : Pseudomonas syringae

Host distribution : Lycopersicon esculentum and Solanum tuberosum

Sign and Symptoms:

The disease is most noticeable on the fruit, where it causes numerous dark brown spots, l-2 mm in diameter. On the leaves bacterial speck causes dark brown to black spots that are usually slightly larger than those on the fruit.

Etiology:

Pathogen survives on nonhost plants. Infection occurs most abundantly after heavy rains . It can harm fruit quality. Infection is favored by cool (less than 70° F), wet conditions. Epidemics often follow rainstorms that cause abrasion of leaves and splash soil onto the foliage.

Gene(s) Resposible for Disease:

Gene ID :

Control:

Biocontrol: Azospirillum brasilense

Chemical control: Kocide 101 (cupric hydroxide)

Bibliography :

Protection of Tomato Seedlings against Infection by Pseudomonas syringae pv. Tomato by Using the Plant Growth-Promoting Bacterium Azospirillum brasilense. , Bashan Y. and de-Bashan L.E. , AppIied Environmental Microbiology. , 2002 ,6840(6): 2637–2643. PMCID: PMC123946.

Molecular and evolutionary analyses of Pseudomonas syringae pv. tomato race 1, Kunkeaw S, Tan S and Coaker G., Molecular Plant Microbe Interaction , 2010 ,23(4):415-24.PMID:20192829 .

Pseudomonas syringae pv. tomato DC3000 type III effector HopAA1-1 functions redundantly with chlorosis-promoting factor PSPTO4723 to produce bacterial speck lesions in host tomato, Munkvold K.R., Russell A.B., Kvitko B.H.and Collmer A.,Molecular Plant Microbe Interaction, 2009 ,22(11):1341-55 PMID:19810804.