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.
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ICRISAT scientists continued to develop high-yielding, long-duration groundnut varieties with resistance to rosette suitable to medium and high rainfall areas. In a study in Tanzania, the first affected plants were seen six days after the first aphids were observed.
The sources of resistance identified in global germplasm need to be characterized based on DNA profile and using molecular markers. However, most of the rosette-resistant varieties released to date are late maturing and are not suitable to some production systems in Africa where the rainy season is short.
On-farm verification and demonstration of agronomically and commercially acceptable high-yielding, rosette-resistant medium- to short-duration groundnut varieties and the package of options for integrated groundnit of groundnut rosette needs to be intensified in the region. Articles with ‘species’ microformats All articles with dead external links Articles with dead external links from March Articles with permanently dead external links. There is a yellowing or mottling of the foliage.
PDF Add to factsheet booklet. For erect types Serenut-4T plant one and a half feet between rows and half a foot between plants along the row.
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 dixease, feeding behavior and transmission efficiency of vector, influence of climatic conditions on vector build-up and dispersal.
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rosetye Resistance to rosette was identified for the first time in Asian and South American land races. Two main forms of the disease, chlorotic rosette and green rosette have been described based on symptoms.
Groundnut Rosette Disease
However, smallholder farmers in Africa for a number of reasons, seldom adopted these practices. Close Find out more.
Groundnut rosette virus was first described in Africa in and causes serious damage to groundnut crops on that continent. Plants that are infected early will produce no yield.
Groundnut Rosette Disease | Plantwise
These sources formed the basis for rosette resistance breeding programs throughout Africa and have contributed to the development of several high-yielding, rosette-resistant groundnut varieties e.
It is spread by aphids feeding on the crop. Knowledge Bank home Change location. Timely planting as soon as there is enough water in the soil.
More recently it has been cultivated in other parts of the world and is an important subsistence crop in Sub-Saharan Africa. Mechanisms of resistance operating against individual causal agents of the disease complex and the vector need to be understood.
Send feedback on this factsheet. In Diseaae, the groundnut aphid feeds on as many as different species of diaease, many of them in the Fabaceae family, and the groundnut rosette virus is presumed to have originated among these.
A package of options has been developed and is being verified on-farm in three agroecologies in Malawi. Sensitive and specific methods to detect the three components of rosette disease have been developed.
Disdase 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.
This will also be useful in establishing the allelic rosete. Groundnut Rosette Disease Recognize the problem There are two types of symptom seen in the crops: Virus resistant varieties of groundnut have been discovered but mostly have a long growing period five to six months rather than three to four for other varieties and may therefore be more susceptible to drought.
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. Groundnut rosette virus EoL: Management of groundnut rosette by insecticidal control of rosett vector has been known since the mids.
InICRISAT-Lilongwe launched a program on screening of global germplasm for resistance against rosette in order to diversify the genetic base of rosette resistance. Groundnut rosette virus disease is a very serious disease of groundnuts in Uganda. From Wikipedia, the free encyclopedia. Spray whole plant with insecticides, ggoundnut as dimethoate, 14 days after emergence usually 5mls per 2 litres of water but read the label for instructions and then at day intervals for a total of four sprays.
ICRISAT scientists developed a simple and effective field screening technique to evaluate germplasm and breeding lines for resistance to rosette. In other projects Wikispecies.