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11
Jul

Cultural methods control of Rice Ragged Stunt

Cultural methods control of Rice Ragged Stunt

1. Cultural practices for the control of Rice ragged stunt of viral disease. There are no specific cultural methods to control the ragged virus disease except for the use of resistant varieties.

2. Some rice varieties are resistant to the Brown planthopper, to the virus, and to both.

3. Cultivars resistant to the vector have low disease incidence.

4. The application of insecticides to migratory planthoppers

11
Jul

Host-Plant Resistance of Rice ragged stunt

Host-Plant Resistance of Rice ragged stunt

1. Rice ragged stunt virus (RRSV) is an important pathogen affecting rice cultivation in South and South East Asia.

2. Sequences from the coding region of RRSV genome segments 7 and 10 (non-structural genes), and 5, 8 and 9 (structural genes) were placed in sense or antisense orientation behind the plant expression promoters CaMV35S, RolC, Ubil, Actl and RBTV.

3. Rice cultivars Taipei 309 and Chinsurah Boro II wer

11
Jul

Symptoms of Rice Ragged Stunt

Symptoms of Rice Ragged Stunt

1. Symptoms of Rice Ragged Stunt viral disease.

2. Infected plants become severely stunted during early growth stages of the crop. Leaves become short and dark green with serrated edges.

3. Leaf blades become twisted at the apex or base, which result in the spiral shape of the leaves. Leaf edges turn uneven and the twisting gives the leaves a ragged appearance.

4. Ragged portions of the leaves are yellow to yellow-brown in

11
Jul

Rice Ragged Stunt - Introduction and Pre-disposing factors

Rice Ragged Stunt Introduction:

1. Rice ragged stunt disease was first found in Indonesia in 1976 and later had a widespread occurrence in countries throughout Asia where rice is grown.

2. The disease is caused by rice ragged stunt virus and transmitted by the Brown plant hopper Nilaparvatha lugens Stal in a persistent manner.

Predisposing facto

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