- The most destructive virus disease on groundnut in sub-Saharan Africa(SSA).
- Three casual agents are invoved in GRD such as Groundnut rosette assistor virus (GRAV), Groundnut roselte virus (GRV) and a satellite RNA (satRNA)
- Trasmitted by an Aphid, aphis craccivora
- Two symtom variants ,chlorotic rosette and green rosette
- Both forms of the diseases cause plants to be severely stunted, with shortened internodes and reduced leaf size , resulting in a bushy appeaerance of plants.
- In chlorotic rosette , leaves are usually bright yellow with a few green islands and leaf lamina is curled.
- In the green rosette , leaves appear dark green,with light green to dark green mosaic
- Destroy virus sources: Remove infected plants after harvest , volunteer plants or that can harbor vector aphids.
- Cultural practices:
- Sow early in the rainy season to take advantage of low-aphid population.
- Remove and destroy early infected plants and fill the gap.
- Maintain optimum plant population in the field, which covers ground thereby discourages landing of vector aphids on the crop.
3. Chemical treatment: Seed treatment with imidaclorprid and followed by regular systemic insecticide spray in the early stages of the crop growth ( from
emergence to 40th day ) will control vector aphids.
4. Cultivate resistant variables : Some resistant cultivators available for cultivation in SSA are ICG 12991 , ICGV-SM 99568 , ICGV 93437 , ICGV-IS 96894 ,