Citrus canker:
Pathogen: Diseases because of a bacterium Xanthomonas citri. This bacterium is of bacillus and gram negative type.
Diagram: Citrus canker
Symptoms:
The disease influences the leaves, twigs, thorns and fruits. Each green parts and maturing fruits turn into more or less covered along with brown scabby spots surrounded through dark–brown glossy margins. The lesions might expand to a diameter of 3 or 4 mm become increased and rough and turn brown. The bacteria enter by the stomata and wounds and multiply in the cortex for which they are confined.
Control:
The infection can be mainly prohibited by eliminating the infected branches and spraying the plants along with Bordeaux mixture or spraying 3 to 4 times in a season along with antibiotic the streptocycline at the rate of 1 gm in 45 liters of water.Tungro disease of rice:
Pathogen: Disease provoked through a virus Rice Tungro virus. The virus is spread by a leafhopper.
Symptoms: The symptoms at first come out on the emerging leaf. They are mild mottling and yellowing, mild interveinal chlorosis (loss of chlorophyll). Plant displays undersized growth and symptoms come out on the lower leaves. They turn yellow orange, possess dark brown color spots and bend downwards.
Transmission of virus: The leafhopper keeps infectivity for a short period just and transmits the virus to other plant instantly after feeding on an infected plant.
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