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11
Jul

Transmission and Control Measures of Rice yellow mottle

Transmission of Rice yellow mottle virus

1. Transmissible by chrysomelid beetles belonging to the subfamilies Criocerinae, Cryptocephalinae, Galerucinae (Sesselia pusilla), Halticinae (Chaetocnema spp.) and Hispinae (Trichispa sericea).

2. The long-horned grasshopper Conocephalus merumontanus also transmits the virus (Bakker, 1974).

3. Chaetocnema pulla carries the virus in the field.

4. S. pusilla, C. pulla and T. sericea sometimes acquire the virus i

11
Jul

Rice Yellow Mottle Virus (RYMV)

Rice Yellow Mottle Virus (RYMV)

1. The morphology of Rice yellow mottle virus

2. The virus is stable in vitro and easy to purify (Bakker, 1970, 1974). Fresh or deep-frozen young rice leaves, harvested 10-12 days after infection are best for purification.

3. Homogenize small pieces in 0.1 M phosphate buffer pH 5.0 + 0.2% 2-mercaptoethanol (1 g of leaves/20 ml of buffer). Squeeze through cloth. Emulsify extract with 0.5 vol chloroform (5 min) and centrifuge at

11
Jul

Rice Yellow Mottle - Introduction, Symptoms and Pre-disposing factors

Introduction to Rice Yellow Mottle

1. Rice yellow mottle virus was reported first in Kenya.

2. This disease is also reported from Liberia, Sierra leone and Tanzania.

3. Infection even at a late stage of growth results in significant yield loss and in severe cases the effected plant may die.

Symptoms of Rice Yellow Mottle

1. The virus causes a yellow or orange leaf discoloration, stunting and sterility in rice.

2. Infected r

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