ses

Rice Tungro Disease

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Causal agent

Rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV)

 

Symptoms

Yellow to yellow orange leaves, stunting, and slightly reduced tillering.

 

At growth stages:

2 (for the greenhouse)

3-5 (for the field)

 

Score and calculate DI at 4 weeks after inoculation in the greenhouse.

SCALE (RGSV1)

1

No symptom observed

3

1-10% height reduction, no distinct yellow to yellow orange leaf discoloration

5

11-30% height reduction, no distinct yellow to yellow orange leaf discoloration

7

31-50% height reduction, with distinct yellow to yellow orange leaf discoloration

9

More than 50% height reduction, with distinct yellow to yellow orange discoloration