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Groundnut Rosette

 

General :  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 Symptoms 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.

Symptoms 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

Management

1. Destroy virus sources: Remove infected plants after harvest , volunteer plants or that can harbor vector aphids.
   

2.  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, ICGV-SM 99541