Bean common mosaic(52,53)
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This powerpoint consist of basic information required to study about Bean Common Mosaic for Bsc.Agriculture and plant pathology.
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Bean common mosaic(52,53)
- 2. 01 02 03 Economic loss varies from 30% to 100% 04 Facts First observed nearly 100 years ago in Russia Epidemics have become sporadic since 1930s Disease is present throughout the world
- 3. Bean common mosaic Causative organism: •Bean common mosaic virus. •Member of potyvirus (Potato virus Y) i.e. largest single group of plant virus that cause economic damage. •Virus is obligate parasite. •Infection is systemic. Survival and spread: •Seed borne and pollen borne. •Mechanical means of transmission(rubbing). •Can be transmitted to other legume crops.
- 4. Symptoms: Three principle symptoms: A.Mosaic B. Black root(systemic necrosis) C.Local leaf lesion
- 5. Mosaic is the symptom most commonly associated with bean common mosaic virus. Distinct or diffuse zones of light- and dark- green tissue are typical.
- 6. Black root occurs when certain strains of bean common mosaic virus infect beans containing the I gene . All plant stages from seedling to mature plant may be affected. Plant die soon after infection.
- 7. Cross section of bean pod and root revealed darkened vascular tissue in the black root reaction.
- 8. Vein banding and leaf cupping and rolling is commonly seen in bean common mosaic virus infections.
- 9. Local lesions, also known as road mapping or veinal necrosis, may develop at the inoculation site of bean common mosaic virus.
- 10. False symptom: •Stunting, leaf rolling and cupping are common symptoms of BCM, but they may also be caused by several other factors. •Bean yellow mosaic virus and beet curly top virus may cause leaf cupping. •Cupping is generally more pronounced in older leaves infected with bean yellow mosaic virus. •Younger leaves are more severely cupped in beet curly top virus infections. •Phenoxy herbicides may also cause plant distortion that may be confused with BCM.
- 11. Etiology: •Bean common mosaic virus (BCMV) is flexous •720*12 nm, contains 95% protein and 5%ssRNA
- 12. Disease cycle: •Primary source of inoculums from infected seed or from nearby infected crops •Secondary spread of the disease by vectors. •Aphid (Aphis fabae, Acyrthosiphon pisum, Myzus persicae) transmits the mosaic virus in non persistent manner from diseased to healthy plant. •Its also transmitted to new plants through pollen •Mechanical mode of transmission (rubbing) •Seed transmission is not known to I gene varieties.
- 13. Management : •Use certified seeds •Early planting escape high insect population. •Intercropping with maize hinder insect activities. •Resistant varieties should be encouraged. •Aphid transmit BCMV non persistently so use systemic insecticide. Seeds Percent tolerance Foundation seed 0.0 Registered seed 0.5 Certified seed 1.0
- 14. Reference: Bean Common Mosaic Virus,(PNW 358) Robert L. Forster, James R. Meyers and Phillip H. Berger, Jan 1991 http://www.google.com
- 15. Thank you