Groundnut rosette disease (GRD), caused by a complex of three agents: groundnut rosette assistor luteovirus, groundnut rosette umbravirus. It depends on groundnut rosette assistor virus (GRAV; Luteoviridae) for encapsidation in GRAV coat protein and for transmission by Aphis craccivora in the. SUMMARY: Groundnut rosette disease is the most important disease of groundnuts of sub-. Saharan Africa. Epidemics occur without warning. It is caused by a.
|Published (Last):||18 October 2004|
|PDF File Size:||20.20 Mb|
|ePub File Size:||12.46 Mb|
|Price:||Free* [*Free Regsitration Required]|
Management of groundnut rosette by insecticidal control of the vector has been known since the mids. For spreading types Serenut grundnut plant three plants per two feet along the row.
Rosette is the most destructive disease of groundnut in Africa. A package of options has been developed and is being verified on-farm in three agroecologies in Malawi.
Timely planting as soon as there is enough water in the soil. Research has shown that plants infected by groundnut rosette virus alone show little or no effect, but rosetye the symptoms of the disease are caused by a satellite RNA co-infectiona subviral agent.
High degree of resistance to rosette or its vector was recently identified in wild Arachis species.
Groundnut Rosette Disease | Plantwise
A breeding programme has been established in Malawi focussing on disease resistance, early maturity and high yield. Groundnut rosette virus EoL: Views Read Edit View history. Groundnut rosette virus disease is a very serious disease of groundnuts in Uganda. InICRISAT-Lilongwe launched a program on screening of global germplasm for resistance against rosette in order to diversify the genetic base of rosette resistance.
The main vector for groundnut rosette virus is the groundnut aphid Aphis craccivora. The recommendations in this factsheet are relevant to: In a study in Tanzania, the first affected plants were seen six days after the first aphids were observed. The sources of resistance from West Africa have extensively been used and several long-duration, high-yielding breeding lines with resistance to rosette have been developed for evaluation and utilization by the National Agricultural Research Systems in the region.
To date, about 12, germplasm lines have been screened and in excess long-duration virginia types and 20 short-duration Spanish types with resistance to rosette have been identified.
Annals of Applied Biology. Send feedback on this factsheet.
There was a problem providing the content you requested
Inheritance of rosette resistance in groundnut was confirmed. Components of integrated management of rosette using high-yielding rosette-resistant varieties ICGV-SM and ICG and cultural practices such as early sowing at optimum plant densities have been investigated.
The disease is epidemic in nature and there is a seasonal cycle of infection, but the origins of this virus are unknown. Hence, there is a need to understand the factors that influence rosette disease outbreaks such as off-season survival of rosette viruses, the relative importance of primary and secondary spread, feeding behavior and transmission efficiency of vector, influence of climatic conditions on vector build-up and dispersal.
Resistant varieties exist such as Serenuts series and Igola 1. From Wikipedia, the free encyclopedia. Articles with ‘species’ microformats All articles with dead external links Articles with dead external links from March Articles with permanently dead external links.
PDF Add to factsheet booklet. This plant was infected early and roeette not produce any yield. This will also be useful in establishing the allelic relationships. Therefore host-plant resistance to the disease and its vector is regarded as the most viable and sustainable solution. ICRISAT scientists continued to develop high-yielding, long-duration groundnut varieties with resistance to rosette suitable to medium and high rainfall areas.
Sensitive and specific methods to detect the three components of rosette disease have been developed.
Resistance to rosette was identified for the first time in Asian and South American land races. Disexse, several high-yielding short-duration days Spanish types with resistance to rosette have been developed and are in on-farm evaluation in southern and eastern Africa.
Groundnut Rosette Rosetts Recognize the problem There are two types of symptom seen in the crops: Close Find out more. Groundnut plants affected take on a bushy appearance due to stunting and distortion of the growing shoots.
The chlorotic and green types are caused by two variants of the satellite RNA while the mosaic type is caused by infection with a mixture of both variants.
Yellow Rosette Virus, no yield will come from the infected plant right. This is to ensure that we give you the best experience possible. Continuing to use www.