9. Complete the following table.
Animal/s affected
Name of disease
Causative agent
Poultry
Bacteria
Sheep, deer, goats and cattle
Virus
Distemper
Fowl pox
10. Complete the following table.
Mode of transmission
Causative agent
Plant disease
Name of plant/s affected
Black stem rust
Wind, water
Fungus
Bacteria
Orange, lemon
Tobacco
Answers
Answer:
Fowlpox is the worldwide disease of poultry caused by viruses of the family Poxviridae and the genus Avipoxvirus. The viruses causing fowlpox are distinct from one another but antigenically similar, possible hosts including chickens, turkeys, quail, canaries, pigeons, and many other species of birds. There are two forms of the disease. The first is spread by biting insects (especially mosquitoes) and wound contamination and causes lesions on the comb, wattles, and beak. Birds affected by this form usually recover within a few weeks. The second form is spread by inhalation of the virus and causes a diphtheritic membrane to form in the mouth, pharynx, larynx, and sometimes the trachea. The prognosis for this form is poor.[1]
Fowlpox virus