Causal Organisms of Plant Diseases
| List of contents |
|---|
| 01: Bacterial diseases of plants |
| 02: Phytoplasma diseases of plants |
01: Causal organisms of the bacterial diseases of plants
| S.N. | Name of disease | Causal organism | More information |
|---|---|---|---|
| 01. | Citrus canker | Xanthomonas axonopodis pv citri. | 01. Other name: Asiatic citrus canker and A form canker |
| 02. | Bacterial blight of cotton | Xanthomonas axonopodis pv malvacearum (Smith) | 01: Other names: Angular leaf spot or black arm of cotton |
| 03. | Bacterial leaf blight of rice | Xanthomonas oryzae pv oryzae | 01: Also known as BLB 02: It survives in many alternate host during off season |
| 04. | Bacterial leaf streak of rice | Xanthomonas oryzae pv oryzicola | 01: Wounds caused by insects aare a major source of entry of the pathogen into the leaves |
| 05. | Bacterial blight and canker of mango | Xanthomonas campestris pv mangiferae-indicae | 01: Copper oxychloride is very effective against the bacterial blight of mango |
| 06. | Black rot of crucifers | Xanthomonas campestris pv compestris | 01. The main source of survival of the bacterium is seed |
| 07. | Red stripe and top rot of sugarcane | Acidovorax avenae subsp. avenae (Manns) | 01. Infection starts through wounds and through stomata 02. Once the disease sets in it is very difficult to manage |
| 08. | Brown rot and wilt of potato | Ralstonia solanacearum (Smith) | 01. It is soil borne disease 02. Bacterial population in soil increase with symptom development in the plant and decline when the plant is dead |
| 09. | Bacterial wilt of tomato and other solanaceae | Ralstonia solanacearum | 01. The attack of root knot infection worsen the disease |
| 10. | Bacterial rot of wheat ears | Rathayibacter tritici | 01. Field soil is not a source of inoculum 02. Galls on plant show the presence of the bacterium |
Bacterial diseases: 11-14
| S.N. | Name of disease | Causal organism | More information |
|---|---|---|---|
| 11. | Ratoon stunting disease of sugarcane | Leifsonia xyli subsp. xyli | 01. The RSD bacteria is sap transmitted |
| 12. | Black leg, wilt and soft rot of potato | 01. Pectobacterium Cartovorum ssp. cartovorum 02. Pectobacterium Cartovorum ssp. atrosepticum | 01. Pathogens are present in rotting tubers 02. Severity of decay of potato tubers is influenced by potato genotype, tuber immaturity, harvest in warm conditions, high water potential, low calcium content, high nitrogen fertilization, and interaction with other pathogens |
| 13. | Common scab of potato | Streptomyces scabies | 01. Streptomyces scabies can persist in soil indefinitely 02. There are two types of lesions on the tuber, the shallow and the deep scab |
| 14. | Citrus greening desease | MLO or mycoplasma like organism | 01. It is common throught the world as a destructive disease 02. Severely affected species are sweet orange, mandarin and tangelo trees |
Phytoplasma Diseases of Plants
Also read: Phytoplasma Plant Diseases Examples
| S. N. | Name of disease | Causal organism | Other information |
|---|---|---|---|
| 01. | Grassy shoot disease of sugarcane | Mycoplasma Like Organism (sugarcane white leaf phytoplasma group) | 01. The vectors are Rhopalosiphum maidis (Aphis maidis), and Melanaphis sacchari form indosacchari |
| 02. | Little leaf of eggppant | Mycoplasma Like Organism (phytoplasma of the clover proliferation group | 01. Loss is up to 90% 02. Vectors: Aphids |
| 03. | Phytoplasma diseases of potato | 1. Purple top roll of potato 2. Marginal flavescence 3. Witches broom | Purple top roll of potato 1. Vector: Orosius albicinctus 2. Causes sterility in plants Marginal flavescence 1. Prevalent in hills and plateau in coolnweather 2. Loss may vary fr 40-70% Witches broom 1. Stream stunting of plant 2. Vector is leaf hopper |
| 04. | Sandal spike disease | Mycoplasma like organism (member of the aster yellows phytoplasma) | 01. Other name: Rosette spike 02. Sandal spike is a yellow type disease with witches effect 03. Vector is leaf hopper 04. Mode of transmission is root contact and insecet vector |
| S. N. | Name of disease | Causal organism | Other information |
|---|---|---|---|