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Tuesday, 14 August 2018

Tungro disease of rice


Tungro disease of rice
Causal agent:-rice tungro virus;syn. Rice leaf-yellowing virus.
Distribution:- The tungro disease has been reported from Philippines, Thailand, western java, southern Sumatra and west Bengal in India.
Symptoms :- Generally, the symptoms appear on leaves. The symptoms appear first on the emerging leaf as a mild interveinal chlorosis followed by a mild mottling and then a yellowing. Later on, stunting occur and symptoms become apparent on the lower leaves which become yellow or yellow-orange, mottled, bent downwards from the collar region and possess dark brown spots.
Transmission of virus:- the virus is transmitted by a leaf hopper Nephotettix impicticeps. The leaf hopper retains infectivity for a short period only, and transmits the virus immediately after feeding on an infected plant. The virus particle is isometric and measure 30 to 3 mili-microne in diameter.

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