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Tungro disease of rice Pathogen Symptoms Control 12 STANDARD BIO BOTANY Higher Secondary Second Year BIOLOGY

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Tungro disease of rice


Pathogen
Disease incited by a virus Rice Tungro virus. The virus is transmitted by a leafhopper.

Symptoms
The symptoms appear first on the emerging leaf. They are mild
interveinal chlorosis (loss of chlorophyll), mild mottling and yellowing. Plant shows stunted growth and symptoms appear on the lower leaves. They turn yellow orange, bend downwards and possess dark brown spots.

Transmission of virus
The leafhopper retains infectivity for a short period only and transmits the virus to another plant immediately after feeding on an infected plant.

Biopesticides
Biological agents that are used for control of insects, weeds and
pathogens produced from living organisms are called biopesticides. Microorganisms such as viruses, bacteria, fungi, protozoa and mites may be used as biopesticides.