GROUNDNUT ROSETTE DISEASE PDF
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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Retrieved from ” dosease Current knowledge on epidemiology of groundnut rosette is very scanty to form the basis for disease forecasting and designing comprehensive disease management strategies or explain the sporadic epidemics of the disease.
Identification of rosette resistance in Spanish types has great significance to the development of high-yielding short-duration froundnut varieties. 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 Disease
Research has shown that plants infected by groundnut rosette virus alone show little or no effect, but that the symptoms of the disease are caused by a satellite RNA co-infectiona subviral agent. Retrieved 13 February The sources of resistance from West Africa have troundnut 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.
Close Find out more. Groundnut rosette virus Virus classification Group: The groundnut aphid, Aphis craccivorais the principal vector of the disease.
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Groundnut rosette virus disease is a very serious disease of groundnuts in Uganda. Plantwise Factsheets for Farmers.
In spite of several achievements made in the past, development of short-duration groundnut varieties with resistance to rosette remained as a challenge to ICRISAT for a long time.
ICRISAT scientists developed a simple and effective field screening technique to evaluate germplasm and breeding lines for resistance to rosette. A package of options has been developed and is being verified on-farm in three agroecologies in Malawi. Groundnut rosette virus EoL: For example, the rosette epidemic in in central Malawi groudnnut eastern Zambia destroyed the crop to such an extent that the total area of groundnut grown rpsette Malawi fell from 92, ha in to 65, ha in Knowledge Bank home Change location.
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 management of groundnut rosette needs to be intensified in the region. In Africa, the groundnut aphid feeds on as many as different species of plant, many of them in the Fabaceae family, and the groundnut rosette virus is presumed to have originated among these.
This is to ensure that we give you the best experience possible. If you would like to, you can learn more about the cookies we use. The disease is caused by a complex of three agents: Groundnut Rosette Disease Recognize the problem There are two types of symptom groundnuy in the crops: Annals of Applied Biology.
For spreading types Serenut 2 plant three plants per two feet along the row. However, smallholder farmers in Africa for a number of reasons, seldom adopted these practices.
Journal of General Virology. Management of groundnut rosette by insecticidal control of the vector has been known since the mids.
Therefore host-plant resistance to the disease and its vector is regarded as the most viable and sustainable solution. Mechanisms of resistance operating against individual causal agents of the diswase complex and the vector need to be understood. This will also be useful in establishing the allelic relationships.
Groundnut rosette virus – Wikipedia
The diseaes 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. Cultural practices such as early sowing at optimal plant densities are known to reduce the disease incidence.
The recommendations in this factsheet are relevant to: InICRISAT-Lilongwe launched a program on screening of global germplasm for resistance against rosette in order to diversify the genetic base of rosette resistance. From Wikipedia, the free encyclopedia. In other projects Wikispecies. More recently it has been cultivated in other parts of the world and is an important subsistence crop in Sub-Saharan Africa.
High degree of resistance to rosette or its vector was recently identified in wild Arachis species. The disease is endemic to sub-Saharan Africa and its off-shore islands, including Madagascar. Breeding for multiple resistance rosette virus complex and the vector should receive high priority.
There is a yellowing or mottling of the foliage. It is spread by aphids feeding on the crop. The sources of resistance identified in gfoundnut germplasm need to be characterized based on DNA profile and using molecular markers.
Spray whole plant with insecticides, such 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. Umbraviruses Viral plant pathogens and diseases Peanut diseases. Yellow Rosette Virus, no yield will come from the infected plant right. Timely planting as soon as there is enough water in the soil. Utilization of wider gene pools should result in identification of certain cross combinations with high recovery of disease resistance and more useful recombinants.
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. This page was last edited on 22 Marchat However, most of the rosette-resistant varieties released to date are late maturing and are not suitable to some production rozette in Africa where the rainy season is short.